java - Java中同步两个方法

Question

我有一个这样的类(class):

public class IClass{

   public void draw(){...};  //is called periodically by the rendering thread
   public void foo(){...};    //is called asynchronously from another Thread(it could be an onTouchEvent() method for example)
}

我希望 foo() 方法等待直到绘制方法完成，反之亦然。我怎样才能在Java中做到这一点？

问候

Answer 1

使方法同步。

public synchronized void draw() {   System.out.println("draw"); }

public synchronized void foo() {    System.out.println("foo"); }

或者在同一个对象上同步。

private static final Object syncObj = new Object();

public void draw() {
    synchronized (syncObj) {
        System.out.println("draw");
    }
}

public void foo() {
    synchronized (syncObj) {
        System.out.println("foo");
    }
}