equals() : Objects Equality

boolean equals(Object obj)

Returns true if two objects are equal. The implementation like below.

   public boolean equals(Object obj) {

        return (this == obj);

    }

class Equals{
 public static void main(String args[]){
  Equals obj1 = new Equals();
  Equals obj2 = new Equals();
  Equals obj3 = obj1;
  
  System.out.println("Is obj1 and obj2 are equals " + obj1.equals(obj2));
  System.out.println("Is obj1 and obj3 are equals " + obj1.equals(obj3));
 }
}

Output

Is obj1 and obj2 are equals false
Is obj1 and obj3 are equals true

If the parameter for the equals is null, then equals method return false.

class ObjectEquals{
 public static void main(String args[]){
  Equals obj1 = new Equals();
  Equals obj2 = null;
  
  System.out.println("Is obj1 and obj2 are equals " + obj1.equals(obj2));
 }
}

Output

Is obj1 and obj2 are equals false

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