Thread interference example

counterThreadClash.java

class counterThreadClash
{
	
	static Counter count = new Counter();
         
	static class t1 extends Thread
        {
	     	public void run()
            {
                for (int i=0;i<50000;i++) {
                 	count.increment();
                }
	         	System.out.println("t1 " + count.value());	     
            }

        }
	
	static class t2 extends Thread
        {
	        public void run() 
	        {
	                for (int i=0;i<50000;i++) {
	                 	count.increment();
	                }
	         	System.out.println("t2 " + count.value());	     
	        }
	}

	public static void main(String [] args)
	{
		new t1().start(); 
        	new t2().start(); 
	}
}

class Counter {
    private int c = 0;

    public void increment() {
        c++;
    }

    public void decrement() {
        c--;
    }

    public int value() {
        return c;
    }

}