java多線程小例子

相信研究多線程的人都會首先從這個經典事例開始：
Stack類：
Java代碼
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類：
Java代碼
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類：
Java代碼
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類：
Java代碼
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();  
    }  
}