Question

谁帮我实现以下Java中的线程交替执行控制，要求按顺序输出1到100，代码如下。

package com.leejiliang.HomeworkDemo2;
/**
* 定义打印输出类，定义两个数据输出方法，分别用于输出偶数和奇数
* @author Administrator
* even偶数 uneven奇数
*/
class PrintNumber{

public void printEven(){
for(int i=0;i<=100;i++){
if(i%2==0){
System.out.println("偶数："+i);
}
}
}
//输出1到100之间的奇数
public void printUnEven(){
for(int i=1;i<=100;i++){
if(i%2!=0){
System.out.println("奇数："+i);
}
}
}
}
/**
*
* @author Administrator
* 定义输出偶数的线程类
*/
class ThreadForEven implements Runnable{
private PrintNumber pn=null;
public ThreadForEven(PrintNumber pn) {
this.pn=pn;
}
@Override
public void run() {
pn.printEven();

}
}
/**
* 定义输出奇数的线程类
* @author Administrator
*
*/
class ThreadForUneven implements Runnable{
private PrintNumber pn=null;
public ThreadForUneven(PrintNumber pn) {
this.pn=pn;
}
@Override
public void run() {
pn.printUnEven();
}
}

//主函数，执行两个线程
class ZeroToOneHundred{
public static void main(String[] args) {
PrintNumber pn=new PrintNumber();
ThreadForEven te=new ThreadForEven(pn);
ThreadForUneven tu=new ThreadForUneven(pn);
Thread threadeven=new Thread(te);
Thread threaduneven =new Thread(tu);
threadeven.start();
threaduneven.start();
}
}

Answer 1

稍微修改下   未测试

package com.leejiliang.HomeworkDemo2;

/**
 * 定义打印输出类，定义两个数据输出方法，分别用于输出偶数和奇数
 * 
 * @author Administrator even偶数 uneven奇数
 */
class PrintNumber {

    boolean isEven = true;

    public void printEven() {

        for (int i = 0; i <= 100; i = i + 2) {
            if (i % 2 == 0) {
                synchronized (this) {
                    while (!isEven) {
                        try {
                            this.wait();
                        } catch (InterruptedException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }
                    }
                    System.out.println("偶数：" + i);
                    isEven = false;
                    this.notify();
                }
            }
        }

    }

    // 输出1到100之间的奇数
    public void printUnEven() {

        for (int i = 1; i <= 99; i = i + 1) {
            if (i % 2 != 0) {
                synchronized (this) {
                    while (isEven) {
                        try {
                            this.wait();
                        } catch (InterruptedException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }
                    }
                    System.out.println("奇数：" + i);
                    isEven = true;
                    this.notify();
                }
            }
        }
    }
}

/**
 * 
 * @author Administrator 定义输出偶数的线程类
 */
class ThreadForEven implements Runnable {
    private PrintNumber pn = null;

    public ThreadForEven(PrintNumber pn) {
        this.pn = pn;
    }

    @Override
    public void run() {
        pn.printEven();

    }
}

/**
 * 定义输出奇数的线程类
 * 
 * @author Administrator
 *
 */
class ThreadForUneven implements Runnable {
    private PrintNumber pn = null;

    public ThreadForUneven(PrintNumber pn) {
        this.pn = pn;
    }

    @Override
    public void run() {
        pn.printUnEven();
    }
}

// 主函数，执行两个线程
class ZeroToOneHundred {
    public static void main(String[] args) {
        PrintNumber pn = new PrintNumber();
        ThreadForEven te = new ThreadForEven(pn);
        ThreadForUneven tu = new ThreadForUneven(pn);
        Thread threadeven = new Thread(te);
        Thread threaduneven = new Thread(tu);
        threadeven.start();
        threaduneven.start();
    }
}

Answer 2

感觉是要两个线程。。。。。。。。但楼主这那么多线程，看着迷糊了

追问

就两个线程啊，可能我描述的不清楚！