java编程利用按钮实现时钟的停止和开始功能（原代码）
如下：
import java.awt.*;
import java.awt.event.*;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;
import java.awt.geom.*;
import java.util.*;
class Clock extends Canvas
implements ActionListener{
static JButton jb=new JButton("开始");
static JButton jb1=new JButton("暂停");
Date date;
Timer secondTime;
int hour,munite,second;
Line2D secondLine,muniteLine,hourLine;
int a,b,c;
double pointSX[]=new double[60],//用来表示秒针端点坐标的数组
pointSY[]=new double[60],
pointMX[]=new double[60], //用来表示分针端点坐标的数组
pointMY[]=new double[60],
pointHX[]=new double[60], //用来表示时针端点坐标的数组
pointHY[]=new double[60];
Clock()
{ secondTime=new Timer(1000,this);
pointSX[0]=0; //12点秒针位置
pointSY[0]=-100;
pointMX[0]=0; //12点分针位置
pointMY[0]=-90;
pointHX[0]=0; //12点时针位置
pointHY[0]=-70;
double angle=6*Math.PI/180; //刻度为6度
for(int i=0;i<59;i++) //计算出各个数组中的坐标
{ pointSX[i+1]=pointSX[i]*Math.cos(angle)-Math.sin(angle)*pointSY[i];
pointSY[i+1]=pointSY[i]*Math.cos(angle)+pointSX[i]*Math.sin(angle);
pointMX[i+1]=pointMX[i]*Math.cos(angle)-Math.sin(angle)*pointMY[i];
pointMY[i+1]=pointMY[i]*Math.cos(angle)+pointMX[i]*Math.sin(angle);
pointHX[i+1]=pointHX[i]*Math.cos(angle)-Math.sin(angle)*pointHY[i];
pointHY[i+1]=pointHY[i]*Math.cos(angle)+pointHX[i]*Math.sin(angle);
}
for(int i=0;i<60;i++)
{ pointSX[i]=pointSX[i]+120; //坐标平移
pointSY[i]=pointSY[i]+120;
pointMX[i]=pointMX[i]+120; //坐标平移
pointMY[i]=pointMY[i]+120;
pointHX[i]=pointHX[i]+120; //坐标平移
pointHY[i]=pointHY[i]+120;
}
secondLine=new Line2D.Double(0,0,0,0);
muniteLine=new Line2D.Double(0,0,0,0);
hourLine=new Line2D.Double(0,0,0,0);
secondTime.start(); //秒针开始计时
}
public void paint(Graphics g)
{ for(int i=0;i<60;i++) //绘制表盘上的小刻度和大刻度
{ int m=(int)pointSX[i];
int n=(int)pointSY[i];
if(i%5==0)
{ g.setColor(Color.red);
g.fillOval(m-4,n-4,8,8);
}
else
{ g.setColor(Color.cyan);
g.fillOval(m-2,n-2,4,4);
}
}
g.fillOval(115,115,10,10); //钟表中心的实心圆
Graphics2D g_2d=(Graphics2D)g;
g_2d.setColor(Color.red);
g_2d.draw(secondLine);
BasicStroke bs=
new BasicStroke(3f,BasicStroke.CAP_ROUND,BasicStroke.JOIN_MITER);
g_2d.setStroke(bs);
g_2d.setColor(Color.blue);
g_2d.draw(muniteLine);
bs=new BasicStroke(6f,BasicStroke.CAP_BUTT,BasicStroke.JOIN_MITER);
g_2d.setStroke(bs);
g_2d.setColor(Color.green);
g_2d.draw(hourLine);
}
public void actionPerformed(ActionEvent e)
{ if(e.getSource()==secondTime){
date=new Date();
String s=date.toString();
hour=Integer.parseInt(s.substring(11,13));
munite=Integer.parseInt(s.substring(14,16));
second=Integer.parseInt(s.substring(17,19)); //获取时间中的秒
int h=hour%12;
a=second; //秒针端点的坐标
b=munite; //分针端点的坐标
c=h*5+munite/12; //时针端点的坐标
secondLine.setLine(120,120,(int)pointSX[a],(int)pointSY[a]);
muniteLine.setLine(120,120,(int)pointMX[b],(int)pointMY[b]);
hourLine.setLine(120,120,(int)pointHX[c],(int)pointHY[c]);
repaint();
} if(e.getSource()==jb){
secondTime.start();
}if(e.getSource()==jb1){
secondTime.stop();
}
}
public static void main(String args[]){
JFrame win=new JFrame("时钟");
JPanel jp=new JPanel();
jp.add(jb);
jp.add(jb1);
Clock clock=new Clock();
jb.addActionListener(clock);
jb1.addActionListener(clock);
win.add(clock,BorderLayout.CENTER);
win.add(jp,"South");
win.setVisible(true);
win.setSize(246,300);
win.setDefaultCloseOperation(3) ;
win.validate();
}
}
运行截图：
有问题就追问，满意请采纳。
//仅供参考
import java.awt.BorderLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTextArea;
public class Test extends JFrame{
/**
* @param args
*/
Boolean flag = true;
JTextArea jta = new JTextArea();
JButton jb = new JButton("button");
public Test(){
jb.addMouseListener(new MouseAdapter(){
public void mouseClicked(MouseEvent e) {
if(flag){
flag = false;
}else{
flag = true;
}
}
});
this.add(jta,BorderLayout.CENTER);
this.add(jb,BorderLayout.SOUTH);
this.setSize(300, 300);
this.setVisible(true);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
Thread thread = new Thread(new Runnable(){
@Override
public void run() {
int i = 0;
while(true){
if(flag){
i = i + 1;
jta.setText(i+"");
try {
Thread.currentThread().sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
});
thread.start();
}
public static void main(String[] args) {
Test test = new Test();
}
}
嗯
