synchronization4.java

该原代码为＜Java编程基础、应用与实例＞的附盘代码

class PrintThread3 extends Thread{
  char ch;
  static Object printer=new Object();
  public PrintThread3(char ch){
  	this.ch=ch;
  }
  void printCh10(){
    synchronized(printer){
      for(int i=1;i<=10;i++)
  	    System.out.print(ch);
  	}   
  }
  public void run(){
    for(int i=1;i<=5;i++){
      printCh10();
      System.out.println();
    }
  }
}
public class Synchronization4{
  public static void main(String[] args) throws Exception{
     PrintThread3 pt1=new PrintThread3('A');
     PrintThread3 pt2=new PrintThread3('B');
     PrintThread3 pt3=new PrintThread3('C');
     pt1.start();
     pt2.start();
     pt3.start();
  }
}