Question

java,自己写的菜单栏出不来

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.*;

public class Chess extends JFrame implements ActionListener{
Toolkit tk = Toolkit.getDefaultToolkit();
//菜单条
private JMenuBar jMenuBar;
//菜单项
private JMenu jMenu;

public void ChessWindow() {
setTitle("中国象棋");
setSize(800, 600);
setVisible(true);
setResizable(false);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}});

//实例化菜单条
jMenuBar = new JMenuBar();
//获得一个菜单项
jMenu = createFileMenu();
//将菜单项加入菜单条
jMenuBar.add(jMenu);
//菜单条设为不透明
jMenuBar.setOpaque(true);
//在容器中加入菜单条
setJMenuBar(jMenuBar);
}

private JMenu createFileMenu() {
//实例化菜单项
JMenu chessMenu = new JMenu("Chess");

//实例化菜单选项
JMenuItem dGame = new JMenuItem("draw");
//加入 ActionListener
dGame.addActionListener(this);
//将选项加入菜单
chessMenu.add(dGame);

JMenuItem exit = new JMenuItem("Exit");
exit.addActionListener(this);
chessMenu.add(exit);

return chessMenu;
}

public void actionPerformed(ActionEvent e) {
if(e.getActionCommand().equals("Exit")){
System.exit(0);
}

if(e.getActionCommand().equals("draw")) {
this.createImage(10, 10);

}
}

public static void main(String[] org) {
Chess c = new Chess();
c.ChessWindow();
}

}

Answer 1

稍微改写一下你的写法，能看到JMENU但是会报错，不习惯你这种写法（NEW个CHESS再调用C.）import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.*;

public class Chess extends JFrame implements ActionListener{
Toolkit tk = Toolkit.getDefaultToolkit();
//菜单条
private JMenuBar jMenuBar;
//菜单项
private JMenu jMenu;

public void ChessWindow() {
setTitle("中国象棋");
setSize(800, 600);
setVisible(true);
setResizable(false);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}});

//实例化菜单条
jMenuBar = new JMenuBar();
//获得一个菜单项
jMenu = createFileMenu();
//将菜单项加入菜单条
jMenuBar.add(jMenu);
//菜单条设为不透明
jMenuBar.setOpaque(true);
//在容器中加入菜单条
setJMenuBar(jMenuBar);
Container c = ContainergetPane();
c.add(jMenu);
}

private Container ContainergetPane() {
// TODO Auto-generated method stub
return null;
}

private JMenu createFileMenu() {
//实例化菜单项
JMenu chessMenu = new JMenu("Chess");

//实例化菜单选项
JMenuItem dGame = new JMenuItem("draw");
//加入 ActionListener
dGame.addActionListener(this);
//将选项加入菜单
chessMenu.add(dGame);

JMenuItem exit = new JMenuItem("Exit");
exit.addActionListener(this);
chessMenu.add(exit);

return chessMenu;
}

public void actionPerformed(ActionEvent e) {
if(e.getActionCommand().equals("Exit")){
System.exit(0);
}

if(e.getActionCommand().equals("draw")) {
this.createImage(10, 10);

}
}

public static void main(String[] org) {
Chess ch = new Chess();
ch.ChessWindow();
}

}

Answer 2

我也没找到哪错了，但是我知道你写的太麻烦了，几行的代码你写了太多了

Answer 3

我测试过了可以啊

追问

我试过了,但是菜单栏没有出来