public class Person{

　　　　~~~~~

}

public class Person extends Object{

　　　　~~~~~

}

public class TestEquals{
  public static void main (String args[]){
    Cat cat1 = new Cat(1,2,3);
    Cat cat2 = new Cat(1,2,3);
    System.out.println(cat1 == cat2);
    System.out.println(cat1.equals(cat2  ));
    
    String s1 = new String("hello");
    String s2 = new String("hello");
    System.out.println(s1 == s2);
    System.out.println(s1.equals(s2));
    
  }
}
class Cat{
  int color;
  int height,weight;
  
  Cat(int color , int height , int weight){
    this.color= color;
    this.height = height;
    this.weight = weight;
  }
  
  public boolean equals(Object obj){
    if(obj == null) return false;
    else{
      if( obj instanceof Cat){
        Cat c = (Cat)obj;
        if(c.color == this.color && c.height == this.height && c.weight == this.weight){
          return true;
        }
      }
    }
    return false;
  }
}