java三线程交替打印123……n

使用多线程交替打印1--n，a进程打印1,4,7,……（3n+1）,b进程打印2,7,10,……（3n+2）,c进程打印3,6,9,……（3n）

涉及到多线程的同步，阻塞，wait,notify

代码如下

Num.java

public class Num {
private int num = 0;

public Num(int num) {
this.num = num;
}

public synchronized void printOne() {
try {
while (num%3!=1) {
this.wait();
}
System.out.println(Thread.currentThread().getName() + "------->"
+ (num++));
Thread.sleep(1000);
this.notifyAll();
} catch (Exception e) {
e.printStackTrace();
}
}

public synchronized void printTwo() {
try {
while (num%3!=2) {
this.wait();
}
System.out.println(Thread.currentThread().getName() + "------->"
+ (num++));

Thread.sleep(1000);

this.notifyAll();
} catch (Exception e) {
e.printStackTrace();
}
}

public synchronized void printThr() {
try {
while (num%3!=0) {
this.wait();
}
System.out.println(Thread.currentThread().getName() + "------->"
+ (num++));
Thread.sleep(1000);
this.notifyAll();
} catch (Exception e) {
e.printStackTrace();
}
}
}三个线程类
public class PrintOne implements Runnable {
private Num num;

public PrintOne(Num num) {
this.num = num;
}

@Override
public void run() {
while (true) {
num.printOne();
}
}
}

public class PrintTwo implements Runnable {
private Num num;

public PrintTwo(Num num) {
this.num = num;
}

@Override
public void run() {
while (true) {
num.printTwo();
}
}
}

public class PrintThr implements Runnable {
private Num num;

public PrintThr(Num num) {
this.num = num;
}

@Override
public void run() {
while (true) {
num.printThr();
}
}
}

测试类
public class Test {
public static void main(String[] args) {
Num num = new Num(0);
Thread pOne = new Thread(new PrintOne(num));
Thread pTwo = new Thread(new PrintTwo(num));
Thread pThr = new Thread(new PrintThr(num));

pOne.setName("3n+1");
pTwo.setName("3n+2");
pThr.setName("3n ");

pOne.start();
pTwo.start();
pThr.start();
}
}

效果

3n  ------->0
3n+1------->1
3n+2------->2
3n  ------->3
3n+1------->4
3n+2------->5

…………