如何实现点击菜单项运行其他操作？
这是实现窗口的部分代码；
package EngineeringDesign;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import javax.swing.JCheckBoxMenuItem;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JRadioButtonMenuItem;
import javax.swing.JTextArea;
import javax.swing.KeyStroke;
public class MenuDemo implements ActionListener {
private String newline = "\n";
private JTextArea output;
public JMenuBar createMenuBar(){
JMenuBar menubar =new JMenuBar();
JMenu menu,submenu,imenu = new JMenu();
JMenuItem menuitem,menuitem1,menuitem2;
JRadioButtonMenuItem rbmenu;
JCheckBoxMenuItem checkbox;
// 定义第一个菜单
menu = new JMenu("(A)功能菜单");
menu.setMnemonic(KeyEvent.VK_A);
menubar.add(menu);
menuitem = new JMenuItem("(O)计时秒表窗口");
menuitem.setMnemonic(KeyEvent.VK_O);
// 设置快捷键
menuitem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O,ActionEvent.ALT_MASK));
// 设置监听，当键盘或鼠标操作是调用操作
menu.add(menuitem);
menuitem.addActionListener(this);
public static void main(String[] args) {
JFrame frame = new JFrame("菜单演示窗口");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
MenuDemo demo = new MenuDemo();
JMenuBar mb = demo.createMenuBar();
frame.setJMenuBar(mb);
frame.setSize(500,400);
frame.setLocation(450,300);
frame.setVisible(true);
}
}是时钟的代码
package EngineeringDesign;
import javax.swing.*;
import java.awt.*;
import java.awt.geom.*;
import java.text.DateFormat;
import java.awt.event.*;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
/**
* This is the main Function of the program.
*/
public class Clock{
public static void main(String []args){
ClockFrame frame = new ClockFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
/**
* This class is used to define the main frame of the clock
*/
class ClockFrame extends JFrame{
//constructor function
public ClockFrame(){
setTitle("小时钟");
setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
setLocation(DEFAULT_LOC_WIDTH, DEFAULT_LOC_HEIGHT);
ClockPanel panel = new ClockPanel();
add(panel);
}
//variables of the frame
private int DEFAULT_LOC_WIDTH = 300;
private int DEFAULT_LOC_HEIGHT = 300;
private int DEFAULT_WIDTH = 330;
private int DEFAULT_HEIGHT = 380;
}
/**
* This class is used to defind the main panel of the clock
*/
class ClockPanel extends JPanel{
public void paintComponent(Graphics g){
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g;
//get the time of the system
DateFormat dateFormat = DateFormat.getDateInstance(DateFormat.FULL);
GregorianCalendar calendar = new GregorianCalendar();
calendar.setTime(new Date());//dateFormat.format(calendar.getTime())
String timeInfo=""; //输出信息
int hour = calendar.get(Calendar.HOUR);
int minute = calendar.get(Calendar.MINUTE);
int second = calendar.get(Calendar.SECOND);
if (hour<=9)
timeInfo+="0"+hour+":"; //格式化输出
else
timeInfo+=hour+":";
if (minute<=9)
timeInfo+="0"+minute+":";
else
timeInfo+=minute+":";
if (second<=9)
timeInfo+="0"+second;
else
timeInfo+=second;
g.setColor(Color.white); //设置当前颜色为白色
Dimension dim=getSize(); //得到窗口尺寸
g.fillRect(0,0,dim.width,dim.height); //填充背景色为白色
g.setColor(Color.black); //设置当前颜色为橙色
g.drawString(timeInfo,130,300); //显示时间字符串
g.setColor(Color.black);
g.drawString(dateFormat.format(calendar.getTime()),10,30);
g.setColor(Color.black);
g.setFont(new Font("SAN_SERIF",Font.BOLD,15));
for(int i=0,num=12;i<360;i+=6)
{
double alfa = Math.toRadians(i);
int xPos=CENTER_X+(int)(R*Math.sin(alfa));
int yPos=CENTER_Y-(int)(R*Math.cos(alfa));
if(i%10==0)
{
if (num%3==0)
g.setColor(Color.red); // 数字3,6,9,12为红色
else
g.setColor(Color.black); // 其余数字为黑色
if(num==12)
{
g.drawString(""+num,xPos-5,yPos+3);}// 写数字
else
g.drawString(""+(num%12),xPos-5,yPos+3);
num=num+1;
}
}
//draw the clock face
Ellipse2D clockFace = new Ellipse2D.Double();
clockFace.setFrameFromCenter(CENTER_X, CENTER_Y, CENTER_X+RADIUS, CENTER_Y+RADIUS);
g2.setColor(Color.BLUE);
g2.draw(clockFace);
//draw the clock center
Ellipse2D clockCenter = new Ellipse2D.Double();
clockCenter.setFrameFromCenter(CENTER_X, CENTER_Y, CENTER_X+INNER_RADIUS, CENTER_Y+INNER_RADIUS);
g2.setColor(Color.RED);
g2.fill(clockCenter);
//help to get the exact position of the lines
double lenX, lenY, posX, posY;
//draw the clock second line
Line2D clockSecond = new Line2D.Double();
double secondTime = (double) calendar.get(Calendar.SECOND);
lenX = SECOND_LEN*Math.sin(2*Math.PI*secondTime/60.0);
lenY = SECOND_LEN*Math.cos(2*Math.PI*secondTime/60.0);
posX = CENTER_X + lenX;
posY = CENTER_Y - lenY;
clockSecond.setLine(CENTER_X, CENTER_Y, posX, posY);
g2.setColor(Color.PINK);
g2.draw(clockSecond);
//draw the clock minute line
Line2D clockMinute = new Line2D.Double();
double minuteTime = (double) calendar.get(Calendar.MINUTE);
lenX = MINUTE_LEN*Math.sin(2*Math.PI*(secondTime+60*minuteTime)/3600.0);
lenY = MINUTE_LEN*Math.cos(2*Math.PI*(secondTime+60*minuteTime)/3600.0);
posX = CENTER_X + lenX;
posY = CENTER_Y - lenY;
clockMinute.setLine(CENTER_X, CENTER_Y, posX, posY);
g2.setColor(Color.GREEN);
g2.draw(clockMinute);
//draw the clock hour line
Line2D clockHour = new Line2D.Double();
double hourTime = (double) calendar.get(Calendar.HOUR);
lenX = HOUR_LEN*Math.sin(2*Math.PI*((secondTime+60*minuteTime+3600*hourTime)/43200.0));
lenY = HOUR_LEN*Math.cos(2*Math.PI*((secondTime+60*minuteTime+3600*hourTime)/43200.0));
posX = CENTER_X + lenX;
posY = CENTER_Y - lenY;
clockHour.setLine(CENTER_X, CENTER_Y, posX, posY);
g2.setColor(Color.BLUE);
g2.draw(clockHour);
int delay = 1000;
// actionListener
ActionListener drawClock;
drawClock=new ActionListener(){
public void actionPerformed(ActionEvent evt){
repaint();
}
};
//create timer
new Timer(delay, drawClock).start();
}
//variables of the panel
private int HOUR_LEN = 50;
private int MINUTE_LEN = 70;
private int SECOND_LEN = 90;
private int RADIUS = 100;
private int INNER_RADIUS = 2;
private int CENTER_X = 150;
private int CENTER_Y = 150;
private int R=90;
}
如图所示点击“时钟窗口”弹出时钟。主窗口和时钟写在不同类中。大神，代码在上方请问如何实现？
