Questions tagged as 'java'

Tagged questions
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Hibernate does not recognize column in database

I made a request in postman and gave the second problem: { "timestamp": "2018-07-27T04:58:28.407+0000", "status": 500, "error": "Internal Server Error", "message": "could not extract ResultSet; SQL [n/a]; nested exception is org.hibern...
asked by 27.07.2018 / 07:45
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Error in Java when creating private class

Every time I try to create a private class in java I can not. Follow the complete code below. package execucaodeprogramas; import java.awt.event.ItemListener; import javax.swing.JCheckBox; import javax.swing.JFrame; import javax.swing.JTextFi...
asked by 13.08.2018 / 17:46
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Complexity function

I'm wondering how to do a complexity function analysis of this Java code package exercicio_2_ed; public class Potencias { public void calcular( int[] numeros ){ for( int i = 0; i < numeros.length; i++ ){ System.out.println( "P...
asked by 22.09.2018 / 20:02
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What am I doing wrong? Java exceptions

Main (TesteExceptions.java:14): Conta c1 = new ContaCorrente(444, 444); c1.setSaldo(5000); Conta c2 = new ContaCorrente(444, 445); c2.setSaldo(353); System.out.println(c1.getSaldo() + "\n" + c2.getSaldo()); c1.transfere(c...
asked by 04.05.2018 / 17:04
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When I use this permission an error occurs in ALL. What do I do? [closed]

When I use this permission, an error occurs in TODO. What do I do? if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this,...
asked by 12.12.2016 / 04:46
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How to check if the date is valid or invalid?

I'm learning Java on my own and I came across an exercise that I do not know where to start searching. I found something about datetime, try, catch. But I could not quite understand why the examples were much more complex than my problem. Cou...
asked by 01.03.2017 / 23:41
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Practical example List and ArrayList

I'm creating a list of Students, but I find myself in the following situation. At point 2 give me error because it says that I have to get the Student inside the List but when I do point 1 is already correct. Can anyone tell me a practical examp...
asked by 19.10.2016 / 16:32
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How do I prevent the object from exceeding the screen boundaries?

I started programming a little game where an object moves across the screen through the arrow keys. The difficulty I encountered is that the object exceeds JFrame , that is, there is nothing to block the passage at the limit of JFrame...
asked by 06.05.2018 / 17:28
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How to extract sentences from a text in Java?

Recently I read an article that looked at the size of several authors' sentences. It was a stylistic study of his works. How do I read a text (with several paragraphs) and extract its sentences? Preferably in Java.     
asked by 14.03.2017 / 21:43
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What does this snippet mean?

Recently I came across a stone in the shoe, I was going to comment on a code, but I realized that I was filling sausage by commenting it, because I do not know what the actual use of the code is: Toolkit tk = Toolkit.getDefaultToolkit(); Dimens...
asked by 18.04.2017 / 03:52