帮你改了一下，可以显示了：import java.awt.*;import javax.swing.*;import java.awt.event.*;public class jm extends JFrame{Container a;private JMenuBar bar;private JMenu file,edit,help;private JMenuItem New,open,exit,about;private JMenu font,color;private JRadioButtonMenuItem red ,blue,green;public jm(){setTitle("Menu Demo...
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