java 多线程 资源共享

在控制资源共享的语句外，加入 synchronized(this)  （this也可用private Object o 对象）,来进行写锁保护 

 

 

class M

{

private static M m = new M();

public static M getInstance()

{

return m;

}

public void check(int i)

{

System.out.println("I'm waiting, Thread "+i);

synchronized(this)

{

System.out.println("I'm processing, Thread "+i);

try {

Thread.sleep(5000l);

} catch (InterruptedException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}

synchronized void method(int i)

{

System.out.println("I'm in synchronized function "+ i);

try {

Thread.sleep(1000l);

} catch (InterruptedException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}

public class CheckCloneable implements Runnable

{

private int i;

private boolean test_function_syn;

CheckCloneable(int i,boolean test_function_syn)

{

this.i = i;

this.test_function_syn = test_function_syn;

}

public void run()

{

M m = M.getInstance();

if(!test_function_syn)

{

m.check(i);

}

else

{

System.out.println("I'm waiting synchronized function "+ i);

m.method(i);

}

}

public static void main(String[] args)

{

for(int i=0;i<5;i++)

{

System.out.println("main");

CheckCloneable c = new CheckCloneable(i,true);

Thread t = new Thread(c);

t.start();

}

}

}