java多线程小例子

最新推荐文章于 2021-02-13 03:05:34 发布

转载最新推荐文章于 2021-02-13 03:05:34 发布 · 890 阅读

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#java #多线程 #string #thread #class #c

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本文通过一个经典的Stack类实现示例介绍了多线程环境下如何使用synchronized关键字及wait和notify方法来实现线程间的同步操作。示例中包含了一个Stack类用于线程间的数据传递，以及Producer和Consumer类来模拟生产者消费者问题。

相信研究多线程的人都会首先从这个经典事例开始：
Stack类：
Java代码
public class Stack {
int count;
    String[] data = new String[20];

    public synchronized void push(String str) {
        while (count == data.length) {
            try {
                this.wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        this.notify();
        data[count] = str;
        count++;
    }
    public synchronized String get() {
        while (count == 0) {
            try {
                this.wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        this.notify();
        count = count - 1;
        return data[count];
    }
}

Producer类：
Java代码
public class Producer implements Runnable {
    Stack Stackone;

    public Producer(Stack s) {
        Stackone = s;
    }

    public void run() {
        String str;
        for (int i = 0; i < 20; i++) {
            str = String.valueOf(i + 1);
            Stackone.push(str);
            System.out.println("Product:" + str + "   count=" + Stackone.count);
            try {
                Thread.sleep((int) (Math.random() * 100));
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}

Coumter类：
Java代码
public class Coumter implements Runnable {
    Stack stackOne;

    public Coumter(Stack s) {
        stackOne = s;
    }

    public void run() {
        String s;
        for (int i = 0; i < 20; i++) {
            s = stackOne.get();
            System.out.println("Coumet:" + s + "   count=" + stackOne.count);
            try {
                Thread.sleep((int) (Math.random() * 100));
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}

StackTest类：
Java代码
public class StackTest {

    public static void main(String[] args) {
        Stack s = new Stack();
        Producer p = new Producer(s);
        Coumter c = new Coumter(s);
        Thread t1 = new Thread(p);
        Thread t2 = new Thread(c);
        t1.start();
        t2.start();
    }
}