Thread counter, Java

Thread counter

//'main' method must be in a class 'Rextester'.
//Compiler version 1.8.0_111

import java.util.*;
import java.lang.*;

class Rextester
{  
    public static synchronized void main(String args[])
    {
        System.out.println("Hello, World!");
       
        CounterImpl c = new CounterImpl();
        System.out.println(c.get());
        c.inc();
        System.out.println(c.get());
        c.inc();
        c.inc();
        System.out.println(c.get());
       
        RunTest t0 = RunTest.getThread("0", c, Thread.MIN_PRIORITY);
        RunTest t1 = RunTest.getThread("1", c, Thread.MAX_PRIORITY);
        RunTest t2 = RunTest.getThread("2", c, Thread.NORM_PRIORITY);
        t1.sleeped(1000);
        try{
            //c.notifyAll();
            
            t0.join();
            t1.join();
            t2.join();
        }catch(InterruptedException e){
            System.out.println(e);
        }
    }

}

class RunTest extends Thread{
    private CounterImpl _counter;
    private String _name;
    private boolean _sleep;
    private int _sleepDuration;
    
    public void run(){
        test();
    }
    
    private void test(){
        for(int i=0; i<50; i++){
            _counter.inc();
            System.out.println(String.format("Thread: %s iteration: %s counter: %s", _name, i, _counter.get()));
            if(_sleep){
                _sleep = false;
                try{
                    System.out.println(String.format("Thread: %s sleeped by %s ...", _name, _sleepDuration));
                    Thread.sleep(_sleepDuration);
                    System.out.println(String.format("Thread: %s weakup ...", _name));
                }catch(InterruptedException e){
                    System.out.println(e);
                }
            }
        }
        System.out.println(String.format("Thread: %s is end!", _name));
    }
    
    public void sleeped(int duration){
        _sleep = true;
        _sleepDuration = duration;
    }
    
    
    public static RunTest getThread(String name, CounterImpl counter, int priority){
        RunTest th = new RunTest(name, counter);
        th.setPriority(priority);
        th.start();
        return th;
    }
    
    public static RunTest getThread(String name, int priority){
        return getThread(name, null, priority);
    }
    
    private RunTest(String name, CounterImpl counter){
        _name = name;
        _counter = counter;
    }
}

class CounterImpl implements Counter{
    private static int _counter;
    
    public synchronized int get(){return _counter;}
    public synchronized void inc(){_counter++;}
    
    CounterImpl(int startValue){
        _counter = startValue;
    }
    
    CounterImpl(){
    }
}

interface Counter{
    public int get();
    public void inc();
}


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