Equals

public class Equals{
public static void main(String args[]){
    Calculator c1=new Calculator();
    Calculator c2=c1;//new Calculator();
    if(c1==c2){
       System.out.println("c1==c2");
    }else{
    System.out.println("c1!=c2");
    }
    if(c1.equals(c2)){
       System.out.println("c1.equals(c2)");
    }else{
      System.out.println(" c1 not equal to (c2)");
    }
}
}