Java實現一個死鎖

Java實現一個死鎖

有一個藏寶圖(treasureMapFragment)分成兩份jack持有treasureMapFragment1殘片1，json持有殘片2。jack要求必須先看到json的殘圖才給json看自己的殘圖，而json要求必須先看到jack的殘圖才給jack看自己的殘圖。雙方都在請求對方持有的資源但是不釋放自己手里的資源，就形成了死鎖。

package yu;

public class DeadLock {
    public static void main(String[] args) {
        Object treasureMapFragment1 = new Object();
        Object treasureMapFragment2 = new Object();
        Thread t1 = new Thread(new Runnable() {
            @Override
            public void run() {
                synchronized (treasureMapFragment1) {
                    String name = Thread.currentThread().getName();
                    System.out.println(name + "持有藏寶圖碎片1");
                    try {
                        Thread.currentThread().sleep(100);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    synchronized (treasureMapFragment2) {
                        System.out.println(name + "同時也獲得了藏寶圖碎片2");
                    }
                }
            }
        });
        Thread t2 = new Thread(new Runnable() {
            @Override
            public void run() {
                synchronized (treasureMapFragment2) {
                    String name = Thread.currentThread().getName();
                    System.out.println(name + "持有藏寶圖碎片2");
                    try {
                        Thread.currentThread().sleep(200);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    synchronized (treasureMapFragment1) {
                        System.out.println(name + "同時也獲得了藏寶圖碎片1");
                    }

                }
            }
        });
        t1.setName("jack");
        t2.setName("json");
        t1.start();
        t2.start();
    }
}