java多線程：15、阻塞隊列【BlockingQueue】

當隊列爲空時取數據的線程堵塞，當隊列滿時放數據的新車堵塞

import java.util.Random;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.Exchanger;

/**
 *阻塞隊列
 */
public class ThreadTest2 {

    public static void main(String[] args) {

        final BlockingQueue<Integer> bq=new ArrayBlockingQueue<>(3);

        for(int i=0;i<2;i++){
            //放數據線程
            new Thread(new Runnable(){
                @Override
                public void run() {
                    while(true){
                        int data=new Random().nextInt(5);
                        try {
                            //當隊列滿時線程堵塞
                            Thread.sleep(data);
                            System.out.println(Thread.currentThread().getName()+"開始放數據");
                            bq.put(data);
                            System.out.println(Thread.currentThread().getName()+"放完數據");
                        } catch (InterruptedException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }
                    }
                }

            }).start();
        }

        //取數據線程 
        new Thread(new Runnable(){

            @Override
            public void run() {
                while(true){
                    try {
                        Thread.sleep(new Random().nextInt(5)*1000);

                        System.out.println(Thread.currentThread().getName()+"開始取數據");
                        //當隊列爲空時線程阻塞
                        int data=bq.take();
                        System.out.println(Thread.currentThread().getName()+"取到數據:"+data);

                    } catch (InterruptedException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }
            }

        }).start();



    }

}