一个简单的计时器按钮，相当简单，但却很有用，放在这儿分享下。
功能：点击开始倒计时，再次点击暂停/开始。
1 import java.awt.Font; 2 import java.awt.event.ActionEvent; 3 import java.awt.event.ActionListener; 4 import java.text.SimpleDateFormat; 5 import java.util.Date; 6 7 import javax.swing.ImageIcon; 8 import javax.swing.JButton; 9 import javax.swing.JLabel; 10 import javax.swing.Timer; 11 12 public class TimerButton extends JButton implements ActionListener{ 13 Date now = null; 14 Timer timer = null; 15 boolean flag=false; 16 boolean flag2=false; 17 Font font=null; 18 public TimerButton(String btnName,int time,ImageIcon timerIcon) { 19 // TODO Auto-generated constructor stub 20 //timerIcon=new ImageIcon("images/timer.gif"); 21 font=new Font("幼圆",Font.BOLD,70); 22 this.setIcon(timerIcon); 23 this.setText("<html><h1>"+btnName+"</h1></html>"); 24 this.addActionListener(this); 25 now=new Date(); 26 //设置倒计时时间. 27 now.setHours(0); 28 now.setMinutes(time); 29 now.setSeconds(0); 30 timer = new Timer(1000, new ActionListener() { 31 public void actionPerformed(ActionEvent e) { 32 now = new Date(now.getTime() - 1000); 33 //SimpleDateFormat formatter = new SimpleDateFormat("HH:mm:ss"); 34 SimpleDateFormat formatter = new SimpleDateFormat("mm:ss"); 35 TimerButton.this.setFont(TimerButton.this.font); 36 TimerButton.this.setText(formatter.format(now)); 37 } 38 }); 39 } 40 public TimerButton(String btnName,int time) { 41 // TODO Auto-generated constructor stub 42 //timerIcon=new ImageIcon("images/timer.gif"); 43 font=new Font("幼圆",Font.BOLD,70); 44 this.setText("<html><h1>"+btnName+"</h1></html>"); 45 this.addActionListener(this); 46 now=new Date(); 47 //设置倒计时时间. 48 now.setHours(0); 49 now.setMinutes(time); 50 now.setSeconds(0); 51 timer = new Timer(1000, new ActionListener() { 52 public void actionPerformed(ActionEvent e) { 53 now = new Date(now.getTime() - 1000); 54 //SimpleDateFormat formatter = new SimpleDateFormat("HH:mm:ss"); 55 SimpleDateFormat formatter = new SimpleDateFormat("mm:ss"); 56 TimerButton.this.setFont(TimerButton.this.font); 57 TimerButton.this.setText(formatter.format(now)); 58 } 59 }); 60 } 61 @Override 62 public void actionPerformed(ActionEvent arg0) { 63 // TODO Auto-generated method stub 64 if(arg0.getSource().equals(TimerButton.this)){ 65 if(flag==false){ 66 this.setIcon(null); 67 this.setFont(new Font("幼圆",Font.BOLD,60)); 68 this.setText("计时开始"); 69 timer.start(); 70 flag=true; 71 } 72 else{ 73 if(flag2==false){ 74 try { 75 timer.stop(); 76 } catch (Exception e) { 77 // TODO Auto-generated catch block 78 e.printStackTrace(); 79 } 80 flag2=true; 81 }else{ 82 timer.start(); 83 flag2=false; 84 } 85 } 86 87 } 88 } 89 }