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大佬们救救菜鸟吧!

Lisir1 发布于 2020-01-04 14:29, 2141 次点击
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3 回复
#2
Lisir12020-01-04 18:27
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.*;
class ItemClick implements ActionListener{
    public void actionPerformed(ActionEvent e) {
        Object obj = e.getSource();
        JMenuItem itm = (JMenuItem)obj;
        System.out.println(itm.getLabel());
        }
    }

public class JMenuDemo extends JFrame{
    JMenuBar jmb;
    JMenu jfile,jedit;
    JMenuItem open,close,save,exit;
    JMenuItem undo,cut,copy,paste;
    public JMenuDemo(String str){
        super(str);
        jmb = new JMenuBar();
        jfile = new JMenu("File");
        jedit = new JMenu("Edit");
        open = new JMenuItem("open");
        open.addActionListener(new ItemClick());
        close = new JMenuItem("close");
        save = new JMenuItem("save");
        exit = new JMenuItem("Exit");
        undo = new JMenuItem("undo");
        cut = new JMenuItem("cut");
        copy = new JMenuItem("copy");
        paste = new JMenuItem("paste");
        this.setJMenuBar(jmb);
        jfile.add(open);
        jfile.add(close);
        jfile.add(save);
        jfile.addSeparator();
        jfile.add(exit);
        jedit.add(undo);
        jedit.addSeparator();
        jedit.add(cut);
        jedit.add(copy);
        jedit.add(paste);
        jmb.add(jfile,0);
        jmb.add(jedit,1);
        this.setLocation(500,200);
        this.setSize(350, 250);
        this.setDefaultCloseOperation(EXIT_ON_CLOSE);
        this.setVisible(true); }
    public static void main(String[] args) {
        new JMenuDemo("1902-17");
    }
 }
#3
林月儿2020-01-04 19:15
42行报错,42是哪行
#4
Lisir12020-01-07 13:24
回复 3楼 林月儿
搞定了第一个回复是正确的
1