JavaSE Swing Menu

package cn.demo;import javax.swing.*;class MyFrame extends JFrame {JMenuBar jbr = null;JMenu []jmenu = null;JMenuItem []item = null;MyFrame() {jbr = new JMenuBar();jmenu = new JMenu[3];jmenu[0] = new JMenu("File");jmenu[1] = new JMenu("View");jmenu[2] = new JMenu("Help");item = new JMenuItem[3];item[0] = new JMenuItem("open");item[1] = new JMenuItem("save");item[2] = new JMenuItem("exit");jmenu[0].add(item[0]);jmenu[0].add(item[1]);jmenu[0].add(item[2]);jbr.add(jmenu[0]);jbr.add(jmenu[1]);jbr.add(jmenu[2]);this.setJMenuBar(jbr);this.setTitle("menu");this.setSize(300, 200);this.setLocation(100, 200);this.setVisible(true);this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);}}public class TestJMenu {public static void main(String[] str) {MyFrame frame = new MyFrame();}}