hashCode Functions in JAVA

//This code is to calculate the no of object created ....How one can calculate the number of object created in java program

class HashCode
{
	public static void main(String[] args)
	{
		String s1=new String("abc");
		String s2=new String("abc");
		String s3=s1+s2;

		int a;


		System.out.println(s1.hashCode());
		System.out.println(s2.hashCode());
		System.out.println(s3.hashCode());
	}
}