Java筆記-Deadlock 死結

不當使用synchronized，造成執行緒資源互鎖，程式無法結束 ##ReadMore## public class Deadlock {
  public static main(String[] args) {
    final Object r1 = "r1";
    final Object r2 = "r2";
    Thread t1 = new Thread() {
      public void run() {
        synchronized(r1) {
          System.out.println("T1 : locked r1");
          try {Thread.sleep(150);}
          catch(InterruptedException e) {}
          synchronized(r2) {
            System.out.println("T1 : locked r2");
          }
        }
      }
    };
    Thread t2 = new Thread() {
      public void run() {
        synchronized(r2) {
          System.out.println("T2 : locked r2");
          try {Thread.sleep(50);}
          catch(InterruptedException e) {}
          synchronized(r1) {
            System.out.println("T2 : locked r1");
          }
        }
      }
    };
    t1.start();
    t2.start();
  }
}
結果輸出：（程式無法停止執行）
T1 : locked r1
T2 : locked r2