锁如何在多线程中使用

package com.ietree.basicskill.mutilthread.lock;import java.util.concurrent.locks.Lock;import java.util.concurrent.locks.ReentrantLock;public class UseReentrantLock {  private Lock lock = new ReentrantLock();  public void method1(){    try {      lock.lock();      System.out.println("当前线程:" + Thread.currentThread().getName() + "进入method1..");      Thread.sleep(1000);      System.out.println("当前线程:" + Thread.currentThread().getName() + "退出method1..");      Thread.sleep(1000);    } catch (InterruptedException e) {      e.printStackTrace();    } finally {      lock.unlock();    }  }  public void method2(){    try {      lock.lock();      System.out.println("当前线程:" + Thread.currentThread().getName() + "进入method2..");      Thread.sleep(2000);      System.out.println("当前线程:" + Thread.currentThread().getName() + "退出method2..");      Thread.sleep(1000);    } catch (InterruptedException e) {      e.printStackTrace();    } finally {      lock.unlock();    }  }  public static void main(String[] args) {    final UseReentrantLock ur = new UseReentrantLock();    Thread t1 = new Thread(new Runnable() {      @Override      public void run() {        ur.method1();        ur.method2();      }    }, "t1");    t1.start();    try {      Thread.sleep(10);    } catch (InterruptedException e) {      e.printStackTrace();    }    //System.out.println(ur.lock.getQueueLength());  }}