java 兩個線程交替打印1-100輸出到控制台：
package com.thread;
public class TestThread {
public static void main(String[] args) {
test();
}
static long sum=0l;
Boolean falg=false;
public static void test() {
PrintNum printNum = new PrintNum();
System.out.println("開始進入th1線程--");
Thread th1=new Thread(new Runnable() {
@Override
public void run() {
while(true) {
try {
printNum.printO();
} catch (InterruptedException e) {
e.printStackTrace();
}
// System.out.println("sum:"+sum);
}}
});
th1.start();
System.out.println("開始進入th2線程--");
Thread th2=new Thread(new Runnable() {
@Override
public void run() {
while(true) {
try {
sum= printNum.printJ();
} catch (InterruptedException e) {
e.printStackTrace();
}
if(sum==100) {
break;
}
}
}});
th2.start();
}
}
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package com.thread;
public class PrintNum {
private long num=0l;
//打印奇數
public synchronized long printJ() throws InterruptedException {
//當num 是偶數時 ，線程等待
while(num % 2==0) {
try {
this.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
System.out.println("打印奇數");
System.out.println(Thread.currentThread().getName()+" :"+ num);
num++;
this.notify();
return num;
}
//打印偶數
public synchronized void printO() throws InterruptedException {
//當num 是奇數時 ，線程等待
while(num % 2==1) {
try {
this.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
System.out.println("打印偶數");
System.out.println(Thread.currentThread().getName()+" :"+ num);
num++;
this.notify();
}
}
