JFrame EXIT_ON_CLOSE vs DISPOSE_ON_CLOSE

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//For creating a Frame JFrame testFrame = new JFrame("This is a test Frame"); //Set Size of the Frame testFrame.setSize(400, 400); //If you set this property as "False", the Frame will be created but hidden in UI. testFrame.setVisible(true); //This is the most important line in your code: //Use only one of the following based on the requirement: //If you have several JFrames open using EXIT_ON_CLOSE closes all the JFrames and exits the app testFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //If you use DISPOSE_ON_CLOSE, only that JFrame will be closed testFrame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);