三个线程同时输出12345 678910 1112131415....以此类推

package thread;

public class th {

public static int j = 0;

public static void main(String[] args) {

for (int i = 0; i < 5; i++) {

t tt = new t();

tt.start();

th.xun();

System.out.println("线程1");

d dd = new d();  dd.start();

}

}

public static synchronized void xun()

{

for (int i = 0; i < 5; i++) {

th.j++;

System.out.println(j);

}

}

}

class t extends Thread{  public void run() {

th.xun();

System.out.println("线程2");

super.run();

}

}

class d extends Thread{ public void run() {

th.xun();

System.out.println("线程3");

super.run();

}

}