There are 4 threads A, B, C, D, respectively printing 1, 2, 3, 4, please start them at the same time, but required to output the results in 1234 order

1. There are 4 Threads a,B,C,D, print separately 1,2,3,4, please start them at the same time, but require to follow The sequential output of the 1234.

public class TestABCThread3 {

Private Object lock = new Object ();

private int count;

public static void Main (string[] args) {

TESTABCTHREAD3 ABC = new TESTABCTHREAD3 ();

New Thread (Abc.new Run ("C", 3)). Start ();

New Thread (Abc.new Run ("D", 4)). Start ();

New Thread (Abc.new Run ("A", 1)). Start ();

New Thread (Abc.new Run ("B", 2)). Start ();

}

Class Run implements Runnable {

Private String _name = "";

private int _threadnum;

Public Run (String name, int threadnum) {

_name = name;

_threadnum = Threadnum;

}

@Override

public void Run () {

Synchronized (lock) {

while (true) {

if (count% 4 = = _threadnum-1) {

System.out.println ("Thread-name:" + _name+ ", No:" +this._threadnum);

count++;

Lock.notifyall ();

Break

} else {

try {

Lock.wait ();

} catch (Interruptedexception e) {

E.printstacktrace ();

}

}

}

}

}

}

}

There are 4 threads A, B, C, D, respectively printing 1, 2, 3, 4, please start them at the same time, but required to output the results in 1234 order