同步锁的问题~~请教各位？非常感谢

Question

public class Info {
private String TAG = "Info";
private String name = "Rollen";
private int age = 20;
private boolean flag = false;

public String getName() {
    return name;
}
public void setName(String name) {
    this.name = name;
}
public int getAge() {
    return age;
}
public void setAge(int age) {
    this.age = age;
}

public synchronized void set(String name, int age){
    if(!flag){
        try {
            super.wait();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }else{
    }

    this.name = name;

    try {
        Thread.sleep(100);
    } catch (InterruptedException e) {
        e.printStackTrace();
    }

    this.age = age;

    flag = false;
    super.notify();

}

public synchronized void get(){

    if(flag){

        try {
            super.wait();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }else{
    }

    try {
        Thread.sleep(100);
    } catch (InterruptedException e) {
        e.printStackTrace();
    }

    Log.d(TAG, "get() -- "+this.name + " - " + this.age);

    flag = true;
    super.notify();
}

}

public class Product implements Runnable{

private Info info = null;

public Product(Info info){
    this.info = info;
}

public void run() {
    boolean flag = false;

    for (int i = 0; i < 25; i++) {
        if(flag){
            info.set("Rollen", 20);
            flag = false;

        }else{

            info.set("ChunGe", 100);

            flag = true;
        }
    }
}

}

public class Consumer implements Runnable{

private Info info = null;

public Consumer(Info info){
    this.info = info;
}

public void run() {

    for (int i = 0; i < 25; i++) {

        try {
            Thread.sleep(50);
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        info.get();
    }
}

}

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    init();
}

private void init(){

    Info info = new Info();

    Product product = new Product(info);
    Consumer consumer = new Consumer(info);

    new Thread(product).start();
    new Thread(consumer).start();
}

}

输出结果：
04:06:37.452: D/Info(1083): get() -- Rollen - 20
04:06:37.662: D/Info(1083): get() -- ChunGe - 100
04:06:37.862: D/Info(1083): get() -- Rollen - 20
04:06:38.072: D/Info(1083): get() -- ChunGe - 100
04:06:38.282: D/Info(1083): get() -- Rollen - 20
04:06:38.482: D/Info(1083): get() -- ChunGe - 100
04:06:38.682: D/Info(1083): get() -- Rollen - 20
04:06:38.892: D/Info(1083): get() -- ChunGe - 100
04:06:39.092: D/Info(1083): get() -- Rollen - 20
04:06:39.302: D/Info(1083): get() -- ChunGe - 100
04:06:39.502: D/Info(1083): get() -- Rollen - 20
04:06:39.702: D/Info(1083): get() -- ChunGe - 100
04:06:39.902: D/Info(1083): get() -- Rollen - 20
04:06:40.112: D/Info(1083): get() -- ChunGe - 100
04:06:40.312: D/Info(1083): get() -- Rollen - 20
04:06:40.512: D/Info(1083): get() -- ChunGe - 100
04:06:40.722: D/Info(1083): get() -- Rollen - 20
04:06:40.912: D/Info(1083): get() -- ChunGe - 100
04:06:41.122: D/Info(1083): get() -- Rollen - 20
04:06:41.332: D/Info(1083): get() -- ChunGe - 100
04:06:41.542: D/Info(1083): get() -- Rollen - 20
04:06:41.742: D/Info(1083): get() -- ChunGe - 100
04:06:41.952: D/Info(1083): get() -- Rollen - 20
04:06:42.152: D/Info(1083): get() -- ChunGe - 100
04:06:42.352: D/Info(1083): get() -- Rollen - 20

请问一下：
为什么打印的结果会交替的这么规律？
生产类和消费类的两个线程的运行状态是怎样的，为什么会一个get对一个set，没有乱掉，当set() wait()的时候，get()运行，运行完成后notify()，这时是set()运行还是下一个get运行？这个时序搞不太清楚？请清楚这一块的同仁，给以指点，尽量详细一些。对wait(),notify(),和synchronized 方法 的用法，没弄的太明白，非常感谢。

Answer 1

你在set方法开始：
if(!flag){
try {
super.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}

    flag标志就限制了set，get一进一出，