多級選單(java GUI)
阿新 • • 發佈:2018-11-29
話不多說,先來效果:
原始碼如下:
package javaBasic; import java.awt.*; import javax.swing.*; import java.awt.event.*; public class Menu { public static void main(String[] args) { MyFrame3 frame = new MyFrame3(); } } class MyFrame3 extends JFrame{ JMenuBar mb;//選單欄 JMenu m1,m2,m3,m4;//選單 JMenuItem mi1,mi2,mi3,mi11,mi12;//選單項 MyFrame3() { this.setTitle("eclipse-worksplace"); this.setSize(500,400); this.setLocationRelativeTo(null); this.setLayout(new FlowLayout()); mb = new JMenuBar(); m1 = new JMenu("File"); m2 = new JMenu("Edit"); m3 = new JMenu("Source"); m4 = new JMenu("new"); mi1 = new JMenuItem("open file"); mi2 = new JMenuItem("exit"); mi11 = new JMenuItem("Java Project"); mi12 = new JMenuItem("Project"); mb.add(m1); mb.add(m2); mb.add(m3); m1.add(m4); m1.add(mi1); m1.add(mi2); m4.add(mi11); m4.add(mi12); this.setJMenuBar(mb);//注意設定選單項的方法是set 不是add this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.setVisible(true); mi2.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { System.exit(0); } }); } }