java多线程

import java.util.*; 
import java.text.*; 
public class TestThread3 { 
 public static void main(String args[]) { 
 Runner r1 = new Runner(1); 
 Thread t1 = new Thread(r1); 
 Thread t2 = new Thread(r1); 
 Thread t3 = new Thread(r1); 
 Runner r2 = new Runner(2); 
 Thread t4 = new Thread(r2); 
 Thread t5 = new Thread(r2); 
 Thread t6 = new Thread(r2); 
 Timer timer = new Timer(); 
 Thread t7 = new Thread(timer); 
 t1.start(); 
 t2.start(); 
 t3.start(); 
 t4.start(); 
 t5.start(); 
 t6.start(); 
 t7.start(); 
 } 
} 
class Runner implements Runnable { 
 int id; 
 Runner(int id){ 
 this.id = id; 
 } 
 public void run() { 
 int i=0; 
 while( true ){ 
 i++; 
 System.out.println("ID: " + id + " No. " + i); 
 try{ Thread.sleep(300); } catch( InterruptedException 
e ){} 
 }
} 
} 
class Timer implements Runnable { 
 public void run(){ 
 while(true){ 
 System.out.println( new SimpleDateFormat(). 
format( new Date())); 
 try{ Thread.sleep(1000); } catch( InterruptedException 
e ){} 
 } 
 } 
}

msconfig

public class TestThreadPriority { 
 public static void main(String args[]) { 
 Thread t1 = new Thread( new Runner(1) ); 
 Thread t2 = new Thread( new Runner(2) ); 
 Thread t3 = new Thread( new Runner(3) ); 
 t1.setPriority( Thread.MIN_PRIORITY ); 
 t2.setPriority( Thread.NORM_PRIORITY ); 
 t3.setPriority( Thread.MAX_PRIORITY ); 
 t1.start(); 
 t2.start(); 
 t3.start(); 
 } 
}
class Runner implements Runnable { 
 int id; 
 Runner(int id){ 
 this.id = id; 
 } 
 public void run() { 
 for(int i=0; i<100; i++ ){ 
 if( i % 100 == 0 ) System.out.print("\r"); 
 Thread.currentThread().yield(); 
 System.out.print(id); 
 } 
 } 
}