多线程的同步

<pre name="code" class="java">package cn.thread;

public class Boo {
	private int x = 100;

    public int getX() {
        return x;
    }

    public synchronized int fix(int y) {
        x = x - y;
        System.out.println(Thread.currentThread().getName() + " : 当前boo对象的y值= " + x);
        return x;
    }
//  //同步代码块
//  public int fix(int y) {
//      synchronized (this) {
//           x = x - y;
//           System.out.println(Thread.currentThread().getName() + " : 当前boo对象的y值= " + x);
//      }
//      
//      return x;
//  }

}

package cn.thread;
public class MyRunnable implements Runnable {
    private Boo foo = new Boo();

    public static void main(String[] args) {
        MyRunnable run = new MyRunnable();
        Thread ta = new Thread(run, "Thread-A");
        Thread tb = new Thread(run, "Thread-B");
        ta.start();
        tb.start();
    }

    public void run() {
        for (int i = 0; i < 3; i++) {
            this.fix(30);
            try {
                Thread.sleep(1);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    public int fix(int y) {
        return foo.fix(y);
    }

}