How to use

setDefaultCloseOperation

method

in

javax.swing.JFrame

  public void run () {
    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
    frame.setSize(480, 320);
    frame.setLocationRelativeTo(null);
    JPanel panel = new JPanel();
    frame.getContentPane().add(panel);
    panel.add(new NewSlider(200, 100, 500, 0.1f, 150, 300));
    frame.setVisible(true);
  }
});

 JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Timer timer = new Timer(1000, (ActionEvent e) -> {
  frame.setTitle(String.valueOf(System.currentTimeMillis()));
});
timer.setRepeats(true);
timer.start();
frame.setVisible(true);

$cat HelloWorldSwing.java
 package start;
 import javax.swing.*;
 public class HelloWorldSwing {
   public static void main(String[] args) {
     //Create and set up the window.
     JFrame frame = new JFrame("HelloWorldSwing");
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     JLabel label = new JLabel("Hello World");
     frame.add(label);
     //Display the window.
     frame.pack();
     frame.setVisible(true);
   }
 }
 class Dummy {
   // just to have another thing to pack in the jar
 }

 import java.awt.Dimension;

import javax.swing.JFrame;

public class JFrameExample {
  public static void main(String[] args) {
    JFrame frame = new JFrame("Hello World");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setMinimumSize(new Dimension(100, 100));
    frame.setVisible(true);
  }
}

public static void main(String args[]) {
  FrameTestBase t = new FrameTestBase();
  t.add(new JComponent() {
    public void paintComponent(Graphics g) {
      String str = "hello world!";
  t.setDefaultCloseOperation(EXIT_ON_CLOSE);
  t.setSize(400, 200);
  t.setVisible(true);

 import javax.swing.*;

public class BoxLayoutFoo extends JFrame {
  public BoxLayoutFoo() {

   // swap the comments below
   setLayout(new BoxLayout(this, BoxLayout.LINE_AXIS)); // comment out this line
   //setLayout(new BoxLayout(getContentPane(), BoxLayout.LINE_AXIS)); // uncomment this line

   setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   pack();
   setVisible(true);
  }

  public static void main(String[] args) {
   new BoxLayoutFoo();
  }
}

 import javax.swing.JFrame;
import javax.swing.JLabel;

public class AnotherJFrame extends JFrame
{
  public AnotherJFrame()
  {
    super("Another GUI");
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    add(new JLabel("Empty JFrame"));
    pack();
    setVisible(true);
  }
}

  public void run () {
    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
    frame.setSize(480, 320);
    frame.setLocationRelativeTo(null);
    JPanel panel = new JPanel();
    frame.getContentPane().add(panel);
    panel.add(new NewSlider(200, 100, 500, 0.1f, 150, 300));
    frame.setVisible(true);
  }
});

 private void makeGUI()
{
  final JFrame f = new JFrame();
  f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  f.getContentPane().setLayout(new FlowLayout());

  // include: "class AnswerWorker" code here.
  // include: "JButton" b code here.

  f.getContentPane().add(b);
  f.getContentPane().add(new JButton("Nothing"));
  f.pack();
  f.setVisible(true);
}

 import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.JFrame;
import javax.swing.WindowConstants;

public class test {

  public static void main(String[] args) {
    final JFrame frame = new JFrame("Test");
    frame.setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE);
    frame.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent ev) {
        //frame.dispose();
      }
    });
    frame.setVisible(true);

  }

}

this.panel = new JPanel();
this.panel.setLayout(new FlowLayout());
add(panel, BorderLayout.CENTER);
JButton button = new JButton("CLICK HERE");
add(button, BorderLayout.SOUTH);
button.addActionListener(this);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(500, 500);
setVisible(true);
this.panel.add(new JButton("Button"));
this.panel.revalidate();
validate();

 package com.stackoverflow.test;

import java.net.URL;
import javax.swing.*;  // Wild carded for brevity. 
            // Actual code imports single classes
public class Main {
  public static void main(String[] args) {
    SwingUtilities.invokeLater(new Runnable(){
      public void run() {
        URL url = Main.class.getResource(
                   "/resources/stackoverflow.png");
        ImageIcon icon = new ImageIcon(url);
        JFrame frame = new JFrame();
        frame.add(new JLabel(icon));
        frame.pack();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
      }
    });
  }
}

  public void run () {
    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
    frame.setSize(480, 320);
    frame.setLocationRelativeTo(null);
    JPanel panel = new JPanel();
    frame.getContentPane().add(panel);
    panel.add(new Slider(200, 100, 500, 0.1f, 150, 300));
    frame.setVisible(true);
  }
});

 @Override
 public void run() {
  // Create and set up the window.
  JFrame frame = new JFrame("XChart");
  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  frame.add(chartPanel);
  // Display the window.
  frame.pack();
  frame.setVisible(true);
 }
});

 import java.awt.AWTEvent;
import java.awt.MouseInfo;
import java.awt.Toolkit;
import java.awt.event.AWTEventListener;

import javax.swing.JFrame;

public class Application1 {
  public static void main(String[] args) {
    Toolkit.getDefaultToolkit().addAWTEventListener(
     new Listener(), AWTEvent.MOUSE_EVENT_MASK | AWTEvent.FOCUS_EVENT_MASK);
    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setVisible(true);
  }

  private static class Listener implements AWTEventListener {
    public void eventDispatched(AWTEvent event) {
      System.out.print(MouseInfo.getPointerInfo().getLocation() + " | ");
      System.out.println(event);
    }
  }
}

 package temp;
import java.awt.EventQueue;
import javax.swing.JFrame;

public class Main {
  public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
      @Override
      public void run() {
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(new NewJPanel());
        f.pack();
        f.setVisible(true);
      }
    });
  }
}

  public void run () {
    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
    frame.setSize(480, 320);
    frame.setLocationRelativeTo(null);
    JPanel panel = new JPanel();
    frame.getContentPane().add(panel);
    panel.add(new Slider(200, 100, 500, 0.1f, 150, 300));
    frame.setVisible(true);
  }
});

 @Override
 public void run() {
  // Create and set up the window.
  JFrame frame = new JFrame("XChart");
  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  frame.add(chartPanel);
  // Display the window.
  frame.pack();
  frame.setVisible(true);
 }
});

public void run() {
  final JFrame f = new JFrame("Say Bye Bye!");
  f.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
  f.addWindowListener( new WindowAdapter() {
    @Override
  f.setSize(300,200);
  f.setLocationByPlatform(true);
  f.setVisible(true);

JFrame f = new JFrame("Frame " + ii);
f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
String s =
  "os.name: " + System.getProperty("os.name") +
  "\nos.version: " + System.getProperty("os.version");
f.add(new JTextArea(s,3,28));  // suggest a size
f.pack();
f.setVisible(true);