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标题: 线程类采用实现Runnable接口的方式。诗歌存为String 数组。所有线程都是从该数组中 [打印本页]

作者: java无忧网 时间: 2020-4-13 15:34
标题: 线程类采用实现Runnable接口的方式。诗歌存为String 数组。所有线程都是从该数组中

4.9 日多线程课程作业

编程

模拟集体诗朗诵的场景（四人同时朗诵一首诗，每人一句。）

编程要求：

“床前明月光，疑是地上霜，举头望明月，低头思故乡”

编写一个包含四个线程的程序，要求诗歌中的诗句由不同的线程依次输出。

Tips:线程类采用实现Runnable接口的方式。诗歌存为String 数组。所有线程都是从该数组中获取要输出的内容。

注意：编程题要求形成word文档提交。代码和运行截图是word文档的构成内容。

注意：本周日将进行第二次单元测。测试内容为线程之前的内容（包括线程内容）

代码：

public class TestMain {

public static ReadString read;

public static void main(String[] args) {

Object lock = new Object();

read = new ReadString();

new ReadThread(0, read, lock).start();

new ReadThread(1, read, lock).start();

new ReadThread(2, read, lock).start();

new ReadThread(3, read, lock).start();

}

class ReadString {

private String[] read = { "床前明月光","疑是地上霜","举头望明月","低头思故乡" };

public synchronized void read(int id, int index) {

if (index >3)

return;

System.out.print("Thread :" + id + " read String :" + read[index] + " \n");

}

class ReadThread extends Thread {

private int threadId;

private ReadString reads;

private Object lock;

private final int COUNT = 4;

public static volatile int flag = 0;

public ReadThread(int id, ReadString read, Object lock) {

this.threadId = id;

this.reads = read;

this.lock = lock;

}

@Override

public void run() {

// TODO Auto-generated method stub

while (true) {

synchronized (lock) {

if ((flag % COUNT) == threadId) {

reads.read(threadId, flag);

flag++;

lock.notifyAll();

} else {

try {

lock.wait();

} catch (InterruptedException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

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