java实现123n_java三线程交替打印123……n
使用多線程交替打印1--n，a進程打印1,4,7,……(3n+1),b進程打印2,7,10,……(3n+2),c進程打印3,6,9,……(3n)
涉及到多線程的同步，阻塞，wait,notify
代碼如下
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();
}
}
} 三個線程類
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();
}
}
}
測試類
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
…………
總結
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