Java Swing How to - Maximize JFrame

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Question

We would like to know how to maximize JFrame.

Answer

/*from w  ww.  j av a  2 s .  c  om*/
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;

public class Main extends JFrame {
  JButton qb = new JButton("quit");
  JPanel p1 = new JPanel();

  JMenuBar menubar = new JMenuBar();
  JMenu file = new JMenu("File");
  JMenuItem eMenuItem = new JMenuItem("Exit");

  public Main() {

    setSize(300, 300);
    setVisible(true);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    setAlwaysOnTop(true);
    setResizable(true);
    setExtendedState(this.getExtendedState() | JFrame.MAXIMIZED_BOTH);
    menubar.add(file);
    setJMenuBar(menubar);
    file.add(eMenuItem);
  }
  public static void main(String[] args) {
    new Main();
  }
}

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