为什么main线程会解锁lock和synchronized

Question

  public static void main(String[] args) {         Lock rl = new ReentrantLock();         try {             rl.lock();             System.out.println("--1" + rl);             rl.lockInterruptibly();             System.out.println("--2" + rl);             rl.lock();             // rl.lockInterruptibly();             synchronized (rl) {                 System.out.println("--3" + rl);             }             System.out.println("--4" + rl);         } catch (InterruptedException e) {             e.printStackTrace();         } finally {             // 解锁             // rl.unlock();             // rl.unlock();         }     } }}把unlock注释掉,输出lock的状态,发现被main线程解锁了,为什么main线程会解锁

Answer 1

因为main是主线程