当java程序包含图形用户界面(GUI)时，Java虚拟机在运行应用程序时会自动启动更多的线程，其中有两个重要的线程：AWT-EventQuecue 和 AWT-Windows。
AWT-EventQuecue 线程负责处理GUI事件，AWT-EventQuecue线程负责将窗体或组件绘制到桌面。JVM保证各个线程都有使用CPU资源的机会.
样列：
1 package tes; 2 3 import java.awt.Color; 4 import java.awt.FlowLayout; 5 import java.awt.Font; 6 import java.awt.event.ActionEvent; 7 import java.awt.event.ActionListener; 8 9 import javax.swing.JFrame; 10 import javax.swing.JLabel; 11 import javax.swing.JTextField; 12 13 /* 14 * 模拟一个打字游戏 15 * */ 16 public class Example12_11 17 { 18 public static void main(String args []) 19 { 20 Wndow wnd= new Wndow(); 21 wnd.setTitle("打字游戏"); 22 wnd.setSleepTime(3000); 23 } 24 } 25 26 class Wndow extends JFrame implements ActionListener ,Runnable 27 { 28 JTextField inputLetter; 29 JLabel showLetter,showScore; 30 int score; 31 Thread giveLetter; //生成字母 32 Wndow() 33 { 34 init(); 35 setBounds(100, 100, 400, 240); 36 //setBackground(Color.green); 37 setVisible(true); 38 setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 39 } 40 void init() 41 { 42 score=0; 43 setLayout(new FlowLayout()); 44 giveLetter = new Thread(this); 45 inputLetter = new JTextField(6); 46 showLetter = new JLabel(" ",JLabel.CENTER); 47 showLetter.setFont(new Font("Arial",Font.BOLD,22)); 48 showScore =new JLabel("分数："); 49 add(new JLabel("显示字母：")); 50 add(showLetter); 51 add(new JLabel("输入字母按回车")); 52 add(inputLetter); 53 inputLetter.addActionListener(this); 54 add(showScore); 55 giveLetter.start(); 56 } 57 58 @Override 59 public void run() { 60 // TODO Auto-generated method stub 61 // String reg="[a-zA-Z]+"; //正则表达式 62 int type[]={65,97}; 63 while(true) 64 { 65 char cc=(char)(((int)(Math.random()*100))%26+type[(int)(Math.random()*1000)%2]); 66 //if(reg.matches(""+cc+"")) 67 { 68 showLetter.setText(""+cc+" "); 69 validate(); //更改容器，所以得用上 70 try { 71 Thread.sleep(1000); 72 } catch (InterruptedException e) { 73 // TODO Auto-generated catch block 74 //e.printStackTrace(); 75 } 76 } 77 } 78 } 79 @Override 80 public void actionPerformed(ActionEvent e) { 81 // TODO Auto-generated method stub 82 String get = inputLetter.getText().trim(); /*trim()方法的作用为删除多余的空格*/ 83 String show =showLetter.getText().trim(); 84 if(get.equals(show)) 85 { 86 score++; 87 showScore.setText(""+score+" "); 88 validate(); 89 } 90 inputLetter.setText(null); 91 giveLetter.interrupt(); //吵醒休眠的线程，以便加快出字母的速度 92 } 93 void setSleepTime(long aa) 94 { 95 try { 96 Thread.sleep(aa); 97 } catch (InterruptedException e) { 98 // TODO Auto-generated catch block 99 e.printStackTrace();100 }101 }102 } 
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代码：计时器
1 package tes; 2 3 import java.awt.FlowLayout; 4 import java.awt.Font; 5 import java.awt.event.ActionEvent; 6 import java.awt.event.ActionListener; 7 import java.io.IOException; 8 import java.text.SimpleDateFormat; 9 import java.util.Date; 10 11 import javax.swing.JButton; 12 import javax.swing.JFrame; 13 import javax.swing.JTextArea; 14 15 16 public class Example12_12 { 17 public static void main(String args []) 18 { 19 wndowThread wnd = new wndowThread(); 20 wnd.setTitle("计时器"); 21 } 22 } 23 24 class wndowThread extends JFrame implements ActionListener,Runnable 25 { 26 Thread givetime; 27 JTextArea showtime; 28 JButton start,end; 29 Date showdate; 30 boolean flag=false,judge=true; 31 SimpleDateFormat myformat = new SimpleDateFormat("hh:mm:ss"); 32 wndowThread() 33 { 34 35 setSize(400, 240); /*大小*/ 36 setLocation(100, 100); /*窗口位置*/ 37 init(); 38 setVisible(true); /*可视*/ 39 setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 40 } 41 void init() 42 { 43 givetime = new Thread(this); 44 showtime = new JTextArea(10,30); 45 /*showtime.setLocation(10, 8);*/ 46 start =new JButton("START"); 47 start.setFont(new Font("Arial",Font.BOLD,22)); 48 start.addActionListener(this); 49 end = new JButton("END"); 50 end.addActionListener(this); 51 end.setFont(new Font("Arial",Font.BOLD,22)); 52 setLayout(new FlowLayout()); 53 add(start); 54 add(end); 55 add(showtime); 56 givetime.start(); 57 } 58 @Override 59 public void actionPerformed(ActionEvent e) { 60 // TODO Auto-generated method stub 61 if(e.getSource()==start) 62 { 63 //先判断线程是否结束 64 if(!(givetime.isAlive())) 65 { 66 givetime =new Thread(this); 67 flag=false; 68 judge=true; 69 } 70 try { 71 givetime.start(); 72 } catch (Exception e1) { 73 // TODO Auto-generated catch block 74 judge=false; 75 showtime.setText("线程没有结束run方法之前，不要再调用start方法."); 76 validate(); 77 } 78 } 79 else if(e.getSource()==end) 80 { 81 flag=true; 82 if(judge==false) 83 { 84 showtime.setText(""); 85 validate(); 86 } 87 } 88 } 89 90 @Override 91 public void run() { 92 // TODO Auto-generated method stub 93 while(true) { 94 if(flag==true) return ; 95 showdate =new Date(); 96 showtime.append("\n\t\t"+myformat.format(showdate)); 97 try { 98 Thread.sleep(1000); 99 } catch (InterruptedException e) {100 // TODO Auto-generated catch block101 e.printStackTrace();102 }103 }104 }105 106 } 