package thread;
/**
* 有四个线程1、2、3、4。线程1的功能就是输出1，线程2的功能就是输出2，以此类推.........现在有四个文件ABCD。初始都为空。现要让四个文件呈如下格式：
* A：1 2 3 4 1 2....
* B：2 3 4 1 2 3....
* C：3 4 1 2 3 4....
* D：4 1 2 3 4 1....
*/
public class Thread1test {
private static volatile int printKey = 0;
private static volatile int countLimit = 0;
private static class Thread1 extends Thread
{
Thread1(){}
@Override
public void run() {
while (countLimit<20)
{
if(printKey==1)
{
countLimit++;
System.out.println(printKey);
printKey+=1;
}
}
}
}
private static class Thread2 extends Thread
{
Thread2(){}
@Override
public void run() {
while (countLimit<20)
{
if(printKey==2)
{
countLimit++;
System.out.println(printKey);
printKey+=1;
}
}
}
}
private static class Thread3 extends Thread
{
Thread3(){}
@Override
public void run() {
while (countLimit<20)
{
if(printKey==3)
{
countLimit++;
System.out.println(printKey);
printKey+=1;
}
}
}
}
private static class Thread4 extends Thread
{
Thread4(){}
@Override
public void run() {
while (countLimit<20)
{
if(printKey==4)
{
countLimit++;
System.out.println(printKey);
printKey=1;
}
}
}
}
public static void main(String[] args)
{
printKey=1;
Thread1 thread1 = new Thread1();
thread1.start();
Thread2 thread2 = new Thread2();
thread2.start();
Thread3 thread3 = new Thread3();
thread3.start();
Thread4 thread4 = new Thread4();
thread4.start();
}
}
