Questions tagged as 'java'

Tagged questions
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List Database with Java or PHP [closed]

I would like to know if there is any way for an application to show all the databases of a connection? I currently use the command: select * from information_schema.TABLES;     
asked by 13.08.2017 / 17:52
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What is the difference between the join () method and the synchronized statement? [closed]

I'm having trouble knowing the difference between the join () method and the synchronized switch.     
asked by 12.11.2018 / 02:46
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Sorting List in Java

If Collections.sort(lista); sorts the list incrementally, what command can I use to drop a list in descending order?     
asked by 03.11.2018 / 04:00
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How to mock a private function in JUnit

I have a main class Usuario that extends ( extends ) an abstract class called Sessao , and uses a function of Sessao called obterDados() that takes the session data and returns it in an object SessaoTO . I...
asked by 17.09.2018 / 17:39
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Java command to add column to table [closed]

I need the Java code on Android to do the column sum of a particular SQLite table. I know the command is " Select sum(coluna) from tabela ", but what I need to know is how to write this in Java to be able to retrieve this value from the...
asked by 14.07.2016 / 04:54
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IllegalStateException [closed]

Good afternoon, I have a simple web application (JSP / Servlets), which when started in Tomcat 8.5.16, does not "rotate" and sends the following message in catalina.out: INFO [Abandoned connection cleanup thread] org.apache.catalina.loader....
asked by 20.11.2018 / 17:32
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I can not put image in a JButton [closed]

I tried to put the image but only gives NullPointerException , I already tried to create a folder called img inside the folder src and point there but without success too. I do not know what I might be doing wrong. The image...
asked by 30.10.2018 / 14:08
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Is it possible to call a class (JFrame) by pressing okay on JOptionPane? [closed]

I would like to open another window by pressing okay in JOptionPane it is possible ? if so ! give me a Light?     
asked by 01.11.2018 / 03:03
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insert with select if the field is null

I have this TODAY in JAVA running but I need to implement a new routine: public void gravarLogAbonoUnificado(TbLogAbonClickUnic entity, RetornoAuxDto auxDto) { STRING SQL = "INSERT INTO" + "TB_...
asked by 13.11.2018 / 14:02
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Jasper Data Filter: Between two dates

I'm having a hard time generating a report in Jasper through java. In Jasper my query all correct, most when I perform through the java presents error. Report query code: select fornecedores.matricula_em, fornecedores.nome_em,fornecedores.e...
asked by 05.01.2019 / 01:01