Java程序求DeBug

Java程序求DeBug

拿去运行下

package test;
import javax.swing.*;
import java.awt.event.*;
public class JPMenu extends JFrame {
JMenuItem reMenu, copyMenu, pasteMenu, cutMenu, delMenu, allMenu;
JPopupMenu jpm;
public JPMenu() {
jpm = new JPopupMenu();
reMenu = new JMenuItem("撤销");
copyMenu = new JMenuItem("复制");
pasteMenu = new JMenuItem("粘贴");
cutMenu = new JMenuItem("剪切");
delMenu = new JMenuItem("删除");
allMenu = new JMenuItem("全选");
jpm.add(reMenu);
jpm.addSeparator();
jpm.add(copyMenu);
jpm.add(pasteMenu);
jpm.add(cutMenu);
jpm.add(delMenu);
jpm.add(allMenu);
MouseListener pl = new PopupListener(jpm);
this.addMouseListener(pl);
this.setTitle("JPopupMenuDemo");
this.setBounds(100, 100, 300, 200);
this.setVisible(true);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String args[]) {
new JPMenu();
}
class PopupListener extends MouseAdapter {
JPopupMenu pm;
PopupListener(JPopupMenu pm1) {
this.pm = pm1;
}
public void mousePressed(MouseEvent e) {
showPopupMenu(e);
}
public void mouseRealeased(MouseEvent e) {
showPopupMenu(e);
}
private void showPopupMenu(MouseEvent e) {
//if (e.isPopupTrigger()) { 判断是否要求弹出一个菜单，在这里是不符合这个判断的
pm.show(e.getComponent(), e.getX(), e.getY());
//}
}
}
}追问不是判断MouseEvent的么？追答直接用getButton() 这个函数就行，如果它的返回值是MouseEvent.BUTTON3，那就是右键；如果它的返回值是MouseEvent.BUTTON2，那就是中键；如果它的返回值是MouseEvent.BUTTON1，那就是左键。

class PopupListener extends MouseAdapter {
JPopupMenu pm;
PopupListener(JPopupMenu pm1) {
this.pm = pm1;
}
public void mousePressed(MouseEvent e) {
if(e.getButton() == 3){
showPopupMenu(e);
}
}
public void mouseRealeased(MouseEvent e) {
showPopupMenu(e);
}
private void showPopupMenu(MouseEvent e) {
//if (e.isPopupTrigger()) { 判断是否要求弹出一个菜单，在这里是不符合这个判断的
pm.show(e.getComponent(), e.getX(), e.getY());
//}
}
}

这样才是真正的右键出菜单

啊啊

private void showPopupMenu(MouseEvent e){
if(e.isPopupTrigger()){
pm.show(e.getComponent(),e.getX(),e.getY());
}
}
把这个if判断去掉追问不是判断MouseEvent的么？追答你只定义了鼠标事件，不需要判断