JFrame.DISPOSE_ON_CLOSE

JFrame.DISPOSE_ON_CLOSE

JFrame setDefaultCloseOperation method  can take various variables.These are

• JFrame.DISPOSE_ON_CLOSE 
• JFrame EXIT_ON_CLOSE.
• JFrame HIDE_ON_CLOSE.
• JFrame DO_NOTHING_ON_CLOSE.

Apart from setDefaultCloseOperation,JFrame swing window has various methods.I have previously looked at some of them.Make sure you check out.

JFrame methods.

• [setSize(new Dimension(400,400)]
• [JFrame.setJMenuBar(bar)]
• setSize()
• setVisible()
• setLocationRelativeTo(null)

JFrame.DISPOSE_ON_CLOSE  Example

[

import javax.swing.JFrame;
import javax.swing.JPanel;

import javax.swing.JTextField;
import javax.swing.JButton;

public class JFrameMethods extends JPanel{

    JFrameMethods()
    {
        JTextField username=new JTextField("Enter Username");
        JTextField password=new JTextField("Enter Password");
        JButton login=new JButton("Login");
        JButton cancel=new JButton("Cancel");
        username.setBounds(10, 10, 100, 20);
        password.setBounds(10, 20, 100, 20);

        add(username);
        add(password);
        add(login);
        add(cancel);


    }

    public static void main(String args[])
    {
        JFrame window=new JFrame("JFrame methods");
        window.getContentPane().add(new JFrameMethods());
        window.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        window.setLocationRelativeTo(null);
        window.setSize(400,400);
        window.setVisible(true);

    }

}

]

Code Explanation:

Above class extends JPanel class.Other swing components you should check out are JTextField and JButton.See also how to implement ActionListener to a JButton 

Code[window.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);]-sets JFrame defaultcloseoperation method to exit the application once its clicked.