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java多线程中的锁的几种用法总结(必看)

package com.ietree.basicskill.mutilthread.lock; import java.util.concurrent...

package com.ietree.basicskill.mutilthread.lock;

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.ReentrantLock;

/**
 * Created by Administrator on 2017/5/17.
 */
public class UseManyCondition {
  private ReentrantLock lock = new ReentrantLock();
  private Condition c1 = lock.newCondition();
  private Condition c2 = lock.newCondition();

  public void m1(){
    try {
      lock.lock();
      System.out.println("当前线程:" +Thread.currentThread().getName() + "进入方法m1等待..");
      c1.await();
      System.out.println("当前线程:" +Thread.currentThread().getName() + "方法m1继续..");
    } catch (Exception e) {
      e.printStackTrace();
    } finally {
      lock.unlock();
    }
  }

  public void m2(){
    try {
      lock.lock();
      System.out.println("当前线程:" +Thread.currentThread().getName() + "进入方法m2等待..");
      c1.await();
      System.out.println("当前线程:" +Thread.currentThread().getName() + "方法m2继续..");
    } catch (Exception e) {
      e.printStackTrace();
    } finally {
      lock.unlock();
    }
  }

  public void m3(){
    try {
      lock.lock();
      System.out.println("当前线程:" +Thread.currentThread().getName() + "进入方法m3等待..");
      c2.await();
      System.out.println("当前线程:" +Thread.currentThread().getName() + "方法m3继续..");
    } catch (Exception e) {
      e.printStackTrace();
    } finally {
      lock.unlock();
    }
  }

  public void m4(){
    try {
      lock.lock();
      System.out.println("当前线程:" +Thread.currentThread().getName() + "唤醒..");
      c1.signalAll();
    } catch (Exception e) {
      e.printStackTrace();
    } finally {
      lock.unlock();
    }
  }

  public void m5(){
    try {
      lock.lock();
      System.out.println("当前线程:" +Thread.currentThread().getName() + "唤醒..");
      c2.signal();
    } catch (Exception e) {
      e.printStackTrace();
    } finally {
      lock.unlock();
    }
  }

  public static void main(String[] args) {


    final UseManyCondition umc = new UseManyCondition();
    Thread t1 = new Thread(new Runnable() {
      @Override
      public void run() {
        umc.m1();
      }
    },"t1");
    Thread t2 = new Thread(new Runnable() {
      @Override
      public void run() {
        umc.m2();
      }
    },"t2");
    Thread t3 = new Thread(new Runnable() {
      @Override
      public void run() {
        umc.m3();
      }
    },"t3");
    Thread t4 = new Thread(new Runnable() {
      @Override
      public void run() {
        umc.m4();
      }
    },"t4");
    Thread t5 = new Thread(new Runnable() {
      @Override
      public void run() {
        umc.m5();
      }
    },"t5");

    t1.start();  // c1
    t2.start();  // c1
    t3.start();  // c2


    try {
      Thread.sleep(2000);
    } catch (InterruptedException e) {
      e.printStackTrace();
    }

    t4.start();  // c1
    try {
      Thread.sleep(2000);
    } catch (InterruptedException e) {
      e.printStackTrace();
    }
    t5.start();  // c2

  }
}