Condition 学习案例

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

public class ConditionMain {
    public static void main(String[] args) {
        ReentrantLock lock = new ReentrantLock();
        Condition condition =lock.newCondition();

        new Thread(()->{
            try {
                lock.lock();
                System.out.println("Step 1 :wait signal ");  //1
                condition.await();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }finally {
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                System.out.println("Step 4 :get signal"); // 4
                lock.unlock();
            }
        }).start();

        new Thread(()->{
            try {
                lock.lock();
                System.out.println("Step 2 :get lock ");  //2
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            condition.signal();
            System.out.println("Step 3 :send signal"); //3
            lock.unlock();
        }).start();



    }
}

打印输出

Step 1 :wait signal 
Step 2 :get lock 
Step 3 :send signal
Step 4 :get signal