Change JTextField value from another class or automatically

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3

I found some similar issues in the English version, but I could not resolve it.

I have a Boiler class, with the following attributes:

  • Boiler temperature;
  • Water quantum;
  • Fire temperature;

In this program I will have to keep the boiler always above a minimum temperature to not stop working or below a maximum temperature to not explode. To do this, as the water evaporates, I add more water (so as not to overheat), and if you add too much water and the temperature drops too much, the temperature of the fire increases.

The problem is that I need to do in 3 different classes (Boiler, Boost Fire and Add Water - each on a different screen) using the Singleton design pattern.

Then I have a button (increase temperature) to open a screen where I can increase the temperature of the fire and thus increase the temperature of the boiler:

ThenIwillhavethe(andclass/screen)buttontoaddwatertoo,butIonlydidthefirefornow.

IcannotupdatethefieldsJTextFieldofthetemperatures(firetemperature(jTextFieldMostraTempFogo)-andboiler(jTextFieldMostraTempCaldeira)inacoolway.AumentarFogo.Thefieldsareasfollows:

1st-Attempt:

publicvoidpreencherTemperaturas(){jTextFieldMostraTempCaldeira.setText(Integer.toString(temperaturaCaldeira));jTextFieldMostraTempFogo.setText(Integer.toString(temperaturaFogo));}

IcreatedthismethodintheBoilerclassandcalleditinsidetheIncreaseFirebuttonintheIncreaseFireclass:

privatevoidjButtonAumentarFogoActionPerformed(java.awt.event.ActionEventevt){Caldeira.getInstance().aumentarFogo(10);//acrescenta+10natemp.dofogoCaldeira.getInstance().preencherTemperaturas();}

Thefunnythingisthatitactuallychangestheattributes,butdoesnotupdatethejText.

2ndAttempt(thisworks,butonlyrefresheswhenIopentheBootScreenagain:

privatevoidjButtonAbrirTelaFogoActionPerformed(java.awt.event.ActionEventevt){AumentarFogoaumentarFogo=newAumentarFogo();aumentarFogo.setVisible(true);//únicajeitoquefunciona.jTextFieldMostraTempCaldeira.setText(Integer.toString(temperaturaCaldeira));jTextFieldMostraTempFogo.setText(Integer.toString(temperaturaFogo));}

Thatis,IcanonlychangethevaluesofJTextFieldwhenIexecuteacommandinsidetheboilerclassitself.ButthevaluesoftheattributesarechangingwhenIclickthebuttonintheAumentarFogoclass.I'vetriedalotofthings,Itriedtoputthebackbutton,sinceitsendsmebacktothemainclass,butitdoesnotworkeither.

IthoughtofusingatimerlistenerasIsawinsomeofthestackquestioninEnglish,butIcouldnotimplementitatall,soIdecidedtoseeifitwouldhaveanyotherway.

ThejTextvariablesarenotstatic.Ievenputthemlikethistodoatest,butthentheydonotchangeinanyway,nordotheyhavetoupdatefromwithintheBoilerclass.

Completeclasses:

BoilerClass:

packagecaldeira;publicclassCaldeiraextendsjavax.swing.JFrame{privatestaticCaldeiracaldeira=null;//declaraçãodaclassestaticconformepadrãodeprojetoSingletonprivatefinalintTEMPERATURAMAXIMA=500;//temperaturamáximaemCºqueacaldeirapodeficarprivatefinalintTEMPERATURAMINIMA=100;//temperaturamínimaemCºqueacaldeirapodeficarprivatefinalintTEMPERATURAMAXIMAFOGO=600;//temperaturamáximaemCºquepodecolocarofogoprivatestaticinttemperaturaCaldeira=120;//valoresiniciaisdosatributosprivatestaticintquantLitrosAgua=100;privatestaticinttemperaturaFogo=130;privateCaldeira(){//construtorprivadoconformepadrãodeprojetoSingletoninitComponents();setLocationRelativeTo(null);jTextFieldMostraTempCaldeira.setText(Integer.toString(temperaturaCaldeira));//jainstanciaocampodetextotempcaldeiracomovalorjTextFieldMostraTempFogo.setText(Integer.toString(temperaturaFogo));//jainstanciaocampodetextotempfogocomovalorSystem.out.println("");
    }

    public void despejarLitrosDeAgua(int despejarLitrosDeAgua) { //acrescentar água para diminuir temperatura da caldeira
        quantLitrosAgua += 10;
    }

    public void aumentarFogo(int aumentoDoFogo) { // aumentar a temperatura do fogo para aumentar a temp. da caldeira
        temperaturaCaldeira += aumentoDoFogo;
        temperaturaFogo += aumentoDoFogo;
    }

    public static synchronized Caldeira getInstance() {
        if (caldeira == null) {
            caldeira = new Caldeira();
        }

        return caldeira;
    }

    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        jPanel1 = new javax.swing.JPanel();
        jButtonAbrirTelaFogo = new javax.swing.JButton();
        jButtonAbrirTelaAgua = new javax.swing.JButton();
        jPanel2 = new javax.swing.JPanel();
        jPanel3 = new javax.swing.JPanel();
        jTextFieldMostraTempCaldeira = new javax.swing.JTextField();
        jLabel2 = new javax.swing.JLabel();
        jLabel3 = new javax.swing.JLabel();
        jTextFieldMostraTempFogo = new javax.swing.JTextField();
        jLabel1 = new javax.swing.JLabel();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("C A L D E I R A O  ");
        setResizable(false);

        jPanel1.setBorder(javax.swing.BorderFactory.createEtchedBorder());

        jButtonAbrirTelaFogo.setText("Aumentar Temperatura");
        jButtonAbrirTelaFogo.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButtonAbrirTelaFogoActionPerformed(evt);
            }
        });

        jButtonAbrirTelaAgua.setText("Diminuir Temperatura");

        jPanel2.setBorder(javax.swing.BorderFactory.createEtchedBorder());

        javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);
        jPanel2.setLayout(jPanel2Layout);
        jPanel2Layout.setHorizontalGroup(
            jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 266, Short.MAX_VALUE)
        );
        jPanel2Layout.setVerticalGroup(
            jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 120, Short.MAX_VALUE)
        );

        jPanel3.setBorder(javax.swing.BorderFactory.createEtchedBorder());

        jTextFieldMostraTempCaldeira.setEditable(false);
        jTextFieldMostraTempCaldeira.setHorizontalAlignment(javax.swing.JTextField.CENTER);

        jLabel2.setFont(new java.awt.Font("Tahoma", 1, 11)); // NOI18N
        jLabel2.setText("Temperatura Caldeirão");

        jLabel3.setFont(new java.awt.Font("Tahoma", 1, 11)); // NOI18N
        jLabel3.setText("Temperatura Fogo");

        jTextFieldMostraTempFogo.setEditable(false);
        jTextFieldMostraTempFogo.setHorizontalAlignment(javax.swing.JTextField.CENTER);

        javax.swing.GroupLayout jPanel3Layout = new javax.swing.GroupLayout(jPanel3);
        jPanel3.setLayout(jPanel3Layout);
        jPanel3Layout.setHorizontalGroup(
            jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel3Layout.createSequentialGroup()
                .addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(jPanel3Layout.createSequentialGroup()
                        .addGap(46, 46, 46)
                        .addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(jLabel3)
                            .addGroup(jPanel3Layout.createSequentialGroup()
                                .addGap(10, 10, 10)
                                .addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                    .addComponent(jTextFieldMostraTempCaldeira, javax.swing.GroupLayout.PREFERRED_SIZE, 84, javax.swing.GroupLayout.PREFERRED_SIZE)
                                    .addComponent(jTextFieldMostraTempFogo, javax.swing.GroupLayout.PREFERRED_SIZE, 84, javax.swing.GroupLayout.PREFERRED_SIZE)))))
                    .addGroup(jPanel3Layout.createSequentialGroup()
                        .addGap(35, 35, 35)
                        .addComponent(jLabel2)))
                .addContainerGap(36, Short.MAX_VALUE))
        );
        jPanel3Layout.setVerticalGroup(
            jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel3Layout.createSequentialGroup()
                .addGap(40, 40, 40)
                .addComponent(jLabel2)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addComponent(jTextFieldMostraTempCaldeira, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(35, 35, 35)
                .addComponent(jLabel3)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addComponent(jTextFieldMostraTempFogo, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );

        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addContainerGap()
                        .addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addGap(87, 87, 87)
                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(jButtonAbrirTelaFogo)
                            .addComponent(jButtonAbrirTelaAgua))))
                .addGap(27, 27, 27)
                .addComponent(jPanel3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(63, Short.MAX_VALUE))
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addGap(43, 43, 43)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
                    .addComponent(jPanel3, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addGap(34, 34, 34)
                        .addComponent(jButtonAbrirTelaFogo)
                        .addGap(18, 18, 18)
                        .addComponent(jButtonAbrirTelaAgua)))
                .addContainerGap(28, Short.MAX_VALUE))
        );

        jLabel1.setFont(new java.awt.Font("Tahoma", 1, 18)); // NOI18N
        jLabel1.setText("nome");

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addContainerGap())
            .addGroup(layout.createSequentialGroup()
                .addGap(171, 171, 171)
                .addComponent(jLabel1)
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addGap(32, 32, 32)
                .addComponent(jLabel1)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 38, Short.MAX_VALUE)
                .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap())
        );

        pack();
    }// </editor-fold>                        

    public void preencherTemperaturas() { // uma das tentativas de alterar o valor dos campos de temperatura: NÃO FUNCIONA
        jTextFieldMostraTempCaldeira.setText(Integer.toString(temperaturaCaldeira));
        jTextFieldMostraTempFogo.setText(Integer.toString(temperaturaFogo));
    }

    private void jButtonAbrirTelaFogoActionPerformed(java.awt.event.ActionEvent evt) {                                                     
        AumentarFogo aumentarFogo = new AumentarFogo();
        aumentarFogo.setVisible(true);

        //única jeito que funciona. Mas fica ruim ter que clicar em aumentar fogo de novo para atualizar.
        jTextFieldMostraTempCaldeira.setText(Integer.toString(temperaturaCaldeira));
        jTextFieldMostraTempFogo.setText(Integer.toString(temperaturaFogo));
    }                                                    

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(Caldeira.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(Caldeira.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(Caldeira.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(Caldeira.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new Caldeira().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify                     
    private javax.swing.JButton jButtonAbrirTelaAgua;
    private javax.swing.JButton jButtonAbrirTelaFogo;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JPanel jPanel2;
    private javax.swing.JPanel jPanel3;
    private javax.swing.JTextField jTextFieldMostraTempCaldeira;
    private javax.swing.JTextField jTextFieldMostraTempFogo;
    // End of variables declaration                   
}

Class AumentarFogo: 

package caldeira;


public class AumentarFogo extends javax.swing.JFrame {

    public AumentarFogo() {
        initComponents();
        setLocationRelativeTo(null);
    }

    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        jPanel1 = new javax.swing.JPanel();
        jButtonAumentarFogo = new javax.swing.JButton();
        jLabel1 = new javax.swing.JLabel();
        jButtonVoltar = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("AumentarFogo");
        setResizable(false);

        jPanel1.setBorder(javax.swing.BorderFactory.createEtchedBorder());

        jButtonAumentarFogo.setText("Aumentar Fogo");
        jButtonAumentarFogo.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButtonAumentarFogoActionPerformed(evt);
            }
        });

        jLabel1.setText("Aumenta a temperatura do Fogo");
        jLabel1.setToolTipText("");

        jButtonVoltar.setText("Voltar");
        jButtonVoltar.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButtonVoltarActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addGap(18, 18, 18)
                        .addComponent(jButtonAumentarFogo))
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addContainerGap()
                        .addComponent(jLabel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addGap(43, 43, 43)
                        .addComponent(jButtonVoltar)))
                .addContainerGap())
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
                .addGap(27, 27, 27)
                .addComponent(jLabel1)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 42, Short.MAX_VALUE)
                .addComponent(jButtonAumentarFogo)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addComponent(jButtonVoltar)
                .addGap(9, 9, 9))
        );

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap(19, Short.MAX_VALUE)
                .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addGap(45, 45, 45))
        );

        pack();
    }// </editor-fold>                        

    private void jButtonVoltarActionPerformed(java.awt.event.ActionEvent evt) {                                              

        Caldeira caldeira = Caldeira.getInstance();
        Caldeira.getInstance().preencherTemperaturas(); // NÃO FUNCIONA
        dispose();

    }                                             

    private void jButtonAumentarFogoActionPerformed(java.awt.event.ActionEvent evt) {                                                    

        Caldeira.getInstance().aumentarFogo(10);
        Caldeira.getInstance().preencherTemperaturas(); //NÃO FUNCIONA

    }                                                   

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(AumentarFogo.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(AumentarFogo.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(AumentarFogo.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(AumentarFogo.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new AumentarFogo().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify                     
    private javax.swing.JButton jButtonAumentarFogo;
    private javax.swing.JButton jButtonVoltar;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JPanel jPanel1;
    // End of variables declaration                   
}
    
asked by anonymous 14.08.2018 / 18:26

1 answer

4

With a few changes, it was possible to make your code work as expected without using singleton. The main one is to avoid working with multiple JFrames, because for this there is the class JDialog , which makes it possible to work with windows dependent on a JFrame or other JDialogs. Changing the class AumentarFogo to JDialog , you do not need to use singleton or anything like this to exchange data between the main frame and this sub-window.

  

Note: As your code is very large, I will comment only on the main changes I made, of the rest, you can check below the two updated classes.

  • First I changed the inheritance of the AumentarFogo class to JDialog and made some changes to the constructor so that it can start correctly. You can refer to class documentation to better understand your parameters.

  • In the button method that increases the fire, I inserted the idea of a "click counter", in this way, just increment the counter each time the button is clicked and you will be able to know how much to increase in the field from the other screen.

  • Since the modal screen keeps access to the main screen stopped until it is closed, to recover the counter value, I created the AumentarFogo method that will return the number of times the button was clicked times the factor that you already used to increase the value of fire.

  • Now in class dispose() , in method getContador() , I delegated what you were doing in the other class, since as I made it in JDialog, methods after Caldeira will only execute when the other screen is closed.

  • Tip: Do not use identical names for methods and classes, even more so in such a giant code, you make the code even more unreadable. Try to give different names, but make sense for what the class / method actually does.

Finally, it follows both modified classes:

  

class AbrirTelaFogo 

import java.awt.Frame;

public class Caldeira extends javax.swing.JFrame {


private static Caldeira caldeira = null; //declaração da classe static conforme padrão de projeto Singleton

private final int TEMPERATURAMAXIMA = 500; //temperatura máxima em Cº que a caldeira pode ficar
private final int TEMPERATURAMINIMA = 100; //temperatura mínima em Cº que a caldeira pode ficar
private final int TEMPERATURAMAXIMAFOGO = 600; //temperatura máxima em Cº que pode colocar o fogo

private static int temperaturaCaldeira = 120; // valores iniciais dos atributos
private static int quantLitrosAgua = 100;
private static int temperaturaFogo = 130;

private Caldeira() { //construtor privado conforme padrão de projeto Singleton
    initComponents();
    setLocationRelativeTo(null);
    jTextFieldMostraTempCaldeira.setText(Integer.toString(temperaturaCaldeira)); //ja instancia o campo de texto tempcaldeira com o valor
    jTextFieldMostraTempFogo.setText(Integer.toString(temperaturaFogo)); //ja instancia o campo de texto tempfogo com o valor
    System.out.println("");
}

public void despejarLitrosDeAgua(int despejarLitrosDeAgua) { //acrescentar água para diminuir temperatura da caldeira
    quantLitrosAgua += 10;
}

public void aumentarFogo(int aumentoDoFogo) { // aumentar a temperatura do fogo para aumentar a temp. da caldeira
    temperaturaCaldeira += aumentoDoFogo;
    temperaturaFogo += aumentoDoFogo;
}

public static synchronized Caldeira getInstance() {
    if (caldeira == null) {
        caldeira = new Caldeira();
    }

    return caldeira;
}

@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">                          
private void initComponents() {

    jPanel1 = new javax.swing.JPanel();
    jButtonAbrirTelaFogo = new javax.swing.JButton();
    jButtonAbrirTelaAgua = new javax.swing.JButton();
    jPanel2 = new javax.swing.JPanel();
    jPanel3 = new javax.swing.JPanel();
    jTextFieldMostraTempCaldeira = new javax.swing.JTextField();
    jLabel2 = new javax.swing.JLabel();
    jLabel3 = new javax.swing.JLabel();
    jTextFieldMostraTempFogo = new javax.swing.JTextField();
    jLabel1 = new javax.swing.JLabel();

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
    setTitle("C A L D E I R A O  ");
    setResizable(false);

    jPanel1.setBorder(javax.swing.BorderFactory.createEtchedBorder());

    jButtonAbrirTelaFogo.setText("Aumentar Temperatura");
    jButtonAbrirTelaFogo.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            jButtonAbrirTelaFogoActionPerformed(evt);
        }
    });

    jButtonAbrirTelaAgua.setText("Diminuir Temperatura");

    jPanel2.setBorder(javax.swing.BorderFactory.createEtchedBorder());

    javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);
    jPanel2.setLayout(jPanel2Layout);
    jPanel2Layout.setHorizontalGroup(
        jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGap(0, 266, Short.MAX_VALUE)
    );
    jPanel2Layout.setVerticalGroup(
        jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGap(0, 120, Short.MAX_VALUE)
    );

    jPanel3.setBorder(javax.swing.BorderFactory.createEtchedBorder());

    jTextFieldMostraTempCaldeira.setEditable(false);
    jTextFieldMostraTempCaldeira.setHorizontalAlignment(javax.swing.JTextField.CENTER);

    jLabel2.setFont(new java.awt.Font("Tahoma", 1, 11)); // NOI18N
    jLabel2.setText("Temperatura Caldeirão");

    jLabel3.setFont(new java.awt.Font("Tahoma", 1, 11)); // NOI18N
    jLabel3.setText("Temperatura Fogo");

    jTextFieldMostraTempFogo.setEditable(false);
    jTextFieldMostraTempFogo.setHorizontalAlignment(javax.swing.JTextField.CENTER);

    javax.swing.GroupLayout jPanel3Layout = new javax.swing.GroupLayout(jPanel3);
    jPanel3.setLayout(jPanel3Layout);
    jPanel3Layout.setHorizontalGroup(
        jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(jPanel3Layout.createSequentialGroup()
            .addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(jPanel3Layout.createSequentialGroup()
                    .addGap(46, 46, 46)
                    .addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addComponent(jLabel3)
                        .addGroup(jPanel3Layout.createSequentialGroup()
                            .addGap(10, 10, 10)
                            .addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                .addComponent(jTextFieldMostraTempCaldeira, javax.swing.GroupLayout.PREFERRED_SIZE, 84, javax.swing.GroupLayout.PREFERRED_SIZE)
                                .addComponent(jTextFieldMostraTempFogo, javax.swing.GroupLayout.PREFERRED_SIZE, 84, javax.swing.GroupLayout.PREFERRED_SIZE)))))
                .addGroup(jPanel3Layout.createSequentialGroup()
                    .addGap(35, 35, 35)
                    .addComponent(jLabel2)))
            .addContainerGap(36, Short.MAX_VALUE))
    );
    jPanel3Layout.setVerticalGroup(
        jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(jPanel3Layout.createSequentialGroup()
            .addGap(40, 40, 40)
            .addComponent(jLabel2)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
            .addComponent(jTextFieldMostraTempCaldeira, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addGap(35, 35, 35)
            .addComponent(jLabel3)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
            .addComponent(jTextFieldMostraTempFogo, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
    );

    javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
    jPanel1.setLayout(jPanel1Layout);
    jPanel1Layout.setHorizontalGroup(
        jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(jPanel1Layout.createSequentialGroup()
            .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(jPanel1Layout.createSequentialGroup()
                    .addContainerGap()
                    .addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGroup(jPanel1Layout.createSequentialGroup()
                    .addGap(87, 87, 87)
                    .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addComponent(jButtonAbrirTelaFogo)
                        .addComponent(jButtonAbrirTelaAgua))))
            .addGap(27, 27, 27)
            .addComponent(jPanel3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addContainerGap(63, Short.MAX_VALUE))
    );
    jPanel1Layout.setVerticalGroup(
        jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(jPanel1Layout.createSequentialGroup()
            .addGap(43, 43, 43)
            .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
                .addComponent(jPanel3, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addGroup(jPanel1Layout.createSequentialGroup()
                    .addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addGap(34, 34, 34)
                    .addComponent(jButtonAbrirTelaFogo)
                    .addGap(18, 18, 18)
                    .addComponent(jButtonAbrirTelaAgua)))
            .addContainerGap(28, Short.MAX_VALUE))
    );

    jLabel1.setFont(new java.awt.Font("Tahoma", 1, 18)); // NOI18N
    jLabel1.setText("nome");

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
    getContentPane().setLayout(layout);
    layout.setHorizontalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
            .addContainerGap()
            .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
            .addContainerGap())
        .addGroup(layout.createSequentialGroup()
            .addGap(171, 171, 171)
            .addComponent(jLabel1)
            .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
    );
    layout.setVerticalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
            .addGap(32, 32, 32)
            .addComponent(jLabel1)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 38, Short.MAX_VALUE)
            .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addContainerGap())
    );

    pack();
}// </editor-fold>                        

public void preencherTemperaturas() { // uma das tentativas de alterar o valor dos campos de temperatura: NÃO FUNCIONA
    jTextFieldMostraTempCaldeira.setText(Integer.toString(temperaturaCaldeira));
    jTextFieldMostraTempFogo.setText(Integer.toString(temperaturaFogo));
}

private void jButtonAbrirTelaFogoActionPerformed(java.awt.event.ActionEvent evt) {                                                     
    AumentarFogo aumentarFogo = new AumentarFogo(this);
    aumentarFogo.setVisible(true);
    aumentarFogo(aumentarFogo.getcontador());
    preencherTemperaturas();

    //única jeito que funciona. Mas fica ruim ter que clicar em aumentar fogo de novo para atualizar.
    jTextFieldMostraTempCaldeira.setText(Integer.toString(temperaturaCaldeira));
    jTextFieldMostraTempFogo.setText(Integer.toString(temperaturaFogo));
}                                                    

/**
 * @param args the command line arguments
 */
public static void main(String args[]) {
    /* Set the Nimbus look and feel */
    //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
    /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
     * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
     */
    try {
        for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
            if ("Nimbus".equals(info.getName())) {
                javax.swing.UIManager.setLookAndFeel(info.getClassName());
                break;
            }
        }
    } catch (ClassNotFoundException ex) {
        java.util.logging.Logger.getLogger(Caldeira.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (InstantiationException ex) {
        java.util.logging.Logger.getLogger(Caldeira.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (IllegalAccessException ex) {
        java.util.logging.Logger.getLogger(Caldeira.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (javax.swing.UnsupportedLookAndFeelException ex) {
        java.util.logging.Logger.getLogger(Caldeira.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    }
    //</editor-fold>

    /* Create and display the form */
    java.awt.EventQueue.invokeLater(new Runnable() {
        public void run() {
            new Caldeira().setVisible(true);
        }
    });
}

// Variables declaration - do not modify                     
private javax.swing.JButton jButtonAbrirTelaAgua;
private javax.swing.JButton jButtonAbrirTelaFogo;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JPanel jPanel1;
private javax.swing.JPanel jPanel2;
private javax.swing.JPanel jPanel3;
private javax.swing.JTextField jTextFieldMostraTempCaldeira;
private javax.swing.JTextField jTextFieldMostraTempFogo;
// End of variables declaration      
}
  

class aumentarFogo.setVisible(true); 

public class AumentarFogo extends javax.swing.JDialog {

    private int contador;

public AumentarFogo(Frame owner) {
    //passa ao construtor do JDialog o vinculo entre a classe 
    // Caldeira e esta classe
    super(owner, true);
    initComponents();
    setLocationRelativeTo(owner);
    contador = 0;
}

@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">                          
private void initComponents() {

    jPanel1 = new javax.swing.JPanel();
    jButtonAumentarFogo = new javax.swing.JButton();
    jLabel1 = new javax.swing.JLabel();
    jButtonVoltar = new javax.swing.JButton();

    setDefaultCloseOperation(javax.swing.WindowConstants.DISPOSE_ON_CLOSE);
    setTitle("AumentarFogo");
    setResizable(false);

    jPanel1.setBorder(javax.swing.BorderFactory.createEtchedBorder());

    jButtonAumentarFogo.setText("Aumentar Fogo");
    jButtonAumentarFogo.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            jButtonAumentarFogoActionPerformed(evt);
        }
    });

    jLabel1.setText("Aumenta a temperatura do Fogo");
    jLabel1.setToolTipText("");

    jButtonVoltar.setText("Voltar");
    jButtonVoltar.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            jButtonVoltarActionPerformed(evt);
        }
    });

    javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
    jPanel1.setLayout(jPanel1Layout);
    jPanel1Layout.setHorizontalGroup(
        jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(jPanel1Layout.createSequentialGroup()
            .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(jPanel1Layout.createSequentialGroup()
                    .addGap(18, 18, 18)
                    .addComponent(jButtonAumentarFogo))
                .addGroup(jPanel1Layout.createSequentialGroup()
                    .addContainerGap()
                    .addComponent(jLabel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                .addGroup(jPanel1Layout.createSequentialGroup()
                    .addGap(43, 43, 43)
                    .addComponent(jButtonVoltar)))
            .addContainerGap())
    );
    jPanel1Layout.setVerticalGroup(
        jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
            .addGap(27, 27, 27)
            .addComponent(jLabel1)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 42, Short.MAX_VALUE)
            .addComponent(jButtonAumentarFogo)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
            .addComponent(jButtonVoltar)
            .addGap(9, 9, 9))
    );

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
    getContentPane().setLayout(layout);
    layout.setHorizontalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
            .addContainerGap(19, Short.MAX_VALUE)
            .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addContainerGap())
    );
    layout.setVerticalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
            .addContainerGap()
            .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
            .addGap(45, 45, 45))
    );

    pack();
}// </editor-fold>                        

private void jButtonVoltarActionPerformed(java.awt.event.ActionEvent evt) {                                              
    // com as alterações feitas, este método não precisa fazer mais nada
    // a nao ser fechar a janela
    dispose();
}                                             

private void jButtonAumentarFogoActionPerformed(java.awt.event.ActionEvent evt) {                                                    
    // aqui você só incrementa o contador para no final
    // calcular quantas vezes irá aumentaro fogo
    contador++;
}  



public int getcontador() {
    //método para você consultar
    // quantas vezes foi clicado
    return contador * 10;
}

/**
 * @param args the command line arguments
 */
public static void main(String args[]) {
    /* Set the Nimbus look and feel */
    //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
    /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
     * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
     */
    try {
        for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
            if ("Nimbus".equals(info.getName())) {
                javax.swing.UIManager.setLookAndFeel(info.getClassName());
                break;
            }
        }
    } catch (ClassNotFoundException ex) {
        java.util.logging.Logger.getLogger(AumentarFogo.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (InstantiationException ex) {
        java.util.logging.Logger.getLogger(AumentarFogo.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (IllegalAccessException ex) {
        java.util.logging.Logger.getLogger(AumentarFogo.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (javax.swing.UnsupportedLookAndFeelException ex) {
        java.util.logging.Logger.getLogger(AumentarFogo.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    }
    //</editor-fold>


}

// Variables declaration - do not modify                     
private javax.swing.JButton jButtonAumentarFogo;
private javax.swing.JButton jButtonVoltar;
private javax.swing.JLabel jLabel1;
private javax.swing.JPanel jPanel1;
// End of variables declaration     

}

See working:

    
14.08.2018 / 20:48
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