JUC并发编程学习笔记-10-阻塞队列BlockingQueue

视频链接

1.抛出异常

import java.util.concurrent.ArrayBlockingQueue;

public class bqTest {
public static void main(String[] args) {
//list
//set
test1();
}
/*
抛出异常
*/
public static void test1(){
//队列的大小
ArrayBlockingQueue blockingQueue = new ArrayBlockingQueue<>(3);

System.out.println(blockingQueue.add("a"));
System.out.println(blockingQueue.add("b"));
System.out.println(blockingQueue.add("c"));
//java.lang.IllegalStateException抛出异常
//System.out.println(blockingQueue.add("d"));
System.out.println(blockingQueue.element());//查看队首元素是谁
System.out.println(blockingQueue.remove());
System.out.println(blockingQueue.remove());
System.out.println(blockingQueue.remove());
//java.util.NoSuchElementException没有元素了
//System.out.println(blockingQueue.remove());

}
}

2.有返回值，没有异常

import java.util.concurrent.ArrayBlockingQueue;

public class bqTest {
public static void main(String[] args) {
//list
//set
test2();
}
/*
有返回值没有异常
*/
public static void test2(){
ArrayBlockingQueue blockingQueue = new ArrayBlockingQueue<>(3);
System.out.println(blockingQueue.offer("a"));
System.out.println(blockingQueue.offer("b"));
System.out.println(blockingQueue.offer("c"));
System.out.println(blockingQueue.offer("d"));//false,不抛出异常
System.out.println("++++++++++++++++++++++++++++++++++++");
System.out.println(blockingQueue.peek());//查看队首元素是谁
System.out.println(blockingQueue.poll());
System.out.println(blockingQueue.poll());
System.out.println(blockingQueue.poll());
System.out.println(blockingQueue.poll());//null  不抛出异常
}
}

3.等待阻塞，一直

import java.util.concurrent.ArrayBlockingQueue;

public class bqTest {
public static void main(String[] args) throws InterruptedException {
//list
//set
test3();
}
/*
等待，阻塞（一直）

*/
public static void test3() throws InterruptedException {
//队列的大小
ArrayBlockingQueue blockingQueue = new ArrayBlockingQueue<>(3);
//一直阻塞
blockingQueue.put("a");
blockingQueue.put("b");
blockingQueue.put("c");
//队列没有位置了，一直等待
//blockingQueue.put("d");

System.out.println(blockingQueue.take());
System.out.println(blockingQueue.take());
System.out.println(blockingQueue.take());
//System.out.println(blockingQueue.take());//没有这个元素，一直等待，阻塞
}
/*
等待，阻塞（等待超时）

*/
}

4.等待，阻塞（等待超时）

import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.TimeUnit;

public class bqTest {
public static void main(String[] args) throws InterruptedException {
//list
//set
test3();
}
/*
等待，阻塞（等待超时）

*/
public static void test3() throws InterruptedException {
//队列的大小
ArrayBlockingQueue blockingQueue = new ArrayBlockingQueue<>(3);

blockingQueue.offer("a");
blockingQueue.offer("b");
blockingQueue.offer("c");
blockingQueue.offer("d",2, TimeUnit.SECONDS);//等待超过两秒就退出

System.out.println("===========");
System.out.println(blockingQueue.poll());
System.out.println(blockingQueue.poll());
System.out.println(blockingQueue.poll());
blockingQueue.poll(2,TimeUnit.SECONDS);//超过两秒就退出
}

}