Implementing synchronized methods in shared data

Synchronized Methods

import java.util.Random;

class Counter {
	private int c=0;
	public synchronized void increment() {
		c++;
	}
	
	public synchronized void decrement() {
		c--;
	}
	
	public synchronized int value() {
		return c;
	}
	
}

class Runner implements Runnable {
	Counter counter;
	
	public Runner(Counter ctr) {
		counter = ctr;
	}
	
	public void run() {
		int c = 0;
		while (c++ < 1000000)
			if (c % 200 == 0)
				counter.decrement();
			else if (c % 50 == 0)
				counter.increment();
			else if (c % 5 == 0)
				System.out.println(counter.value());
	}
}

public class CheckingSync {
	
	public static void main(String[] args) {
		Counter ctr = new Counter();
		Thread t1 = new Thread(new Runner(ctr));
		Thread t2 = new Thread(new Runner(ctr));
		t1.start();
		t2.start();
	}
}