java中鼠标右击弹出菜单怎样实现

java中鼠标右击弹出菜单怎样实现

简单的实现代码如下：
import java.awt.MenuBar;import java.awt.event.MouseAdapter;import java.awt.event.MouseEvent;import javax.swing.JFrame;import javax.swing.JPopupMenu;/* * java中鼠标右击弹出菜单怎样实现 */public class Demo {public static void main(String[] args) {final JFrame jf = new JFrame("窗体");jf.setSize(300, 300);jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);jf.setLocationRelativeTo(null);// 创建弹出菜单final JPopupMenu jp = new JPopupMenu();jp.add("红色");jp.add("蓝色");jf.addMouseListener(new MouseAdapter() {@Overridepublic void mouseClicked(MouseEvent e) {if (e.getButton() == MouseEvent.BUTTON3) {// 弹出菜单jp.show(jf, e.getX(), e.getY());}}});jf.setVisible(true);}}
2015-12-23

给你个例子
import java.awt.*;import java.awt.event.*;import javax.swing.*;//左键弹出菜单public class JPopMenuDemo extends JFrame {JRadioButtonMenuItem items[]; //菜单项Color[] colors={Color.blue,Color.pink,Color.yellow,Color.red,Color.orange}; //颜色数组JPopupMenu popupMenu; //弹出菜单public JPopMenuDemo(){super( "右键弹出菜单" ); //调用父类构造函数ChangeColorAction action = new ChangeColorAction(); //菜单项事件处理String[] str = {"Blue","Pink","Yellow","Red","Orange"}; //菜单项名称ButtonGroup colorGroup=new ButtonGroup(); //实例化按钮组popupMenu=new JPopupMenu(); //实例化弹出菜单items=new JRadioButtonMenuItem[5]; //初始化数组for (int i=0;i items[i]=new JRadioButtonMenuItem(str[i]); //实例化菜单项popupMenu.add(items[i]); //增加菜单项到菜单上colorGroup.add(items[i]); //增加菜单项到按钮组items[i].addActionListener(action); //菜单项事件处理}addMouseListener(new MouseAdapter(){ //窗口的鼠标事件处理public void mousePressed( MouseEvent event ) { //点击鼠标triggerEvent(event); //调用triggerEvent方法处理事件}public void mouseReleased( MouseEvent event ) { //释放鼠标triggerEvent(event);}private void triggerEvent(MouseEvent event) { //处理事件if (event.isPopupTrigger()) //如果是弹出菜单事件(根据平台不同可能不同)popupMenu.show(event.getComponent(),event.getX(),event.getY()); //显示菜单}});getContentPane().setBackground(Color.white); //窗口的默认背景色为白色setSize(230,160); //设置窗口大小setVisible(true); //设置窗口为可视setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE ); //关闭窗口时退出程序}class ChangeColorAction implements ActionListener { //菜单项事件处理public void actionPerformed(ActionEvent event) {for (int i=0;i if (event.getSource()==items[i]) { //判断事件来自于哪个菜单项getContentPane().setBackground(colors[i]); //设置窗口背景repaint(); //重绘窗口return;}}}public static void main( String args[]) {new JPopMenuDemo();}}2015-12-23

没有缩进还有错误的代码没法看，代码改造一下方能实现右键菜单的功能：
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
//左键弹出菜单
public class JPopMenuDemo extends JFrame {
JRadioButtonMenuItem items[]; //菜单项
Color[] colors={Color.blue,Color.pink,Color.yellow,Color.red,Color.orange}; //颜色数组
JPopupMenu popupMenu; //弹出菜单

public JPopMenuDemo()
{
super( "右键弹出菜单" ); //调用父类构造函数
ChangeColorAction action = new ChangeColorAction(); //菜单项事件处理
String[] str = {"Blue","Pink","Yellow","Red","Orange"}; //菜单项名称
ButtonGroup colorGroup=new ButtonGroup(); //实例化按钮组
popupMenu=new JPopupMenu(); //实例化弹出菜单
items=new JRadioButtonMenuItem[5]; //初始化数组
for (int i=0;i<items.length;i++){
items[i]=new JRadioButtonMenuItem(str[i]); //实例化菜单项
popupMenu.add(items[i]); //增加菜单项到菜单上
colorGroup.add(items[i]); //增加菜单项到按钮组
items[i].addActionListener(action); //菜单项事件处理
}

addMouseListener(new MouseAdapter(){ //窗口的鼠标事件处理
public void mousePressed( MouseEvent event ) { //点击鼠标
triggerEvent(event); //调用triggerEvent方法处理事件
}
public void mouseReleased( MouseEvent event ) { //释放鼠标
triggerEvent(event);
}
private void triggerEvent(MouseEvent event) { //处理事件
if (event.isPopupTrigger()) //如果是弹出菜单事件(根据平台不同可能不同)
popupMenu.show(event.getComponent(),event.getX(),event.getY()); //显示菜单
}
});

getContentPane().setBackground(Color.white); //窗口的默认背景色为白色
int width = 280;//窗口宽
int height = 360;//窗口高
setSize(width,height); //设置窗口大小
setVisible(true); //设置窗口为可视
Dimension screensize = Toolkit.getDefaultToolkit().getScreenSize();
setLocation((screensize.width-width)/2, (screensize.height-height)/2);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE ); //关闭窗口时退出程序

}
class ChangeColorAction implements ActionListener { //菜单项事件处理
public void actionPerformed(ActionEvent event) {
for (int i=0;i<=items.length;i++){
if (event.getSource()==items[i]) { //判断事件来自于哪个菜单项
getContentPane().setBackground(colors[i]); //设置窗口背景
repaint(); //重绘窗口
return;
}
}
}
}
public static void main( String args[]) {
new JPopMenuDemo();
}
}2018-03-09