定義一個dog類

public class Dog {private String name;public String getName() {return name;}public void setName(String name) {this.name = name;} }

定義一個同步對象鎖

//同步對象鎖 public class SysObject implements Runnable {private Dog dog;public SysObject(){if(dog==null){dog=new Dog();}}public void run(){Thread current=Thread.currentThread();synchronized (dog){for(int i=1;i<10;i++){System.out.println( "線程"+current.getName()+"在修改dog的名字" );dog.setName( "卡爾"+ i);System.out.println( dog.getName() );try {Thread.sleep( 1000 );}catch (InterruptedException e){e.printStackTrace();}}}} }

測試類

public class test109 {public static void main(String[] args){SysObject sysObj=new SysObject();Thread t0=new Thread( sysObj,"歌謠" );Thread t1=new Thread( sysObj,"小白" );Thread t2=new Thread( sysObj,"小紅" );t2.setPriority( Thread.MAX_PRIORITY );t2.start();t1.start();t0.start();} }

運行結果

總結

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