java wait 研究

[color=red]java wait 的使用必须放在实例对象本身的锁的范围内，
而且wait对于锁的释放仅仅只对 实例对象本身的锁有用
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package com.sohu.smc.test;

public class TestWait {
public static final Object a=new Object();
public static final Object b=new Object();
public static Runnable r = null;
public static void main(String[] args) throws InterruptedException {
       r = new A();
new Thread(r).start();//a =1//a的值是一样的
// new Thread(r).start();// a=1
Thread.sleep(100);
Runnable rr = new B();
new Thread(rr).start();// 必须等待
}


}

class A implements Runnable{

int a = 0;
@Override
public void run() {
    a=+1;
System.out.println("A"+a);
synchronized (TestWait.a) {//

synchronized (this) {
try {
wait(10000);//仅仅是释放this锁，即对本对象的枷锁
System.out.println("....aaa");
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}

}

}
class B implements Runnable{


public  B(){
System.out.println("init b");
}

@Override
public void run() {
System.out.println("b....");
synchronized (TestWait.a) {// 假如是 TestWait.r ， 则需要等待wait(10000); 结束
System.out.println("..............b");
}

}

}