Java Equals Operators / Chapter -5/Operator & Assignments

Java Equals Operator

1. The result of Equality Operator is boolean either true or false.These are Equality operators in java.

= =, !=
 2.We can apply Equality Operators for primitive type and boolean type.
example:-
System.out.println(10==20) ;       output is             false
System.out.println(10!=20) ;        output is              true
System.out.println('a'=='b') ;      output is             false
System.out.println('a'==97) ;        output is              true
System.out.println(false==false) ;  output is            true

3. We can apply equality operator for objects.
If both references are pointing to the same object then equality operator returns true.
If both references are not pointing to the same object then equality operator returns false.
example:-
Test t1=new Test( );
Test t2=new Test( );
Test t3=t1;

                  System.out.println(t1==t2) ; output is false
System.out.println(t1==t3) ; output is true

Difference between Equality Operator and .equals( ) method

In java Equality operators( == , != )are meant for reference comparison(address comparison).
.equals( ) method is meant for content comparison .
example:-
String s1= new String("javabychetan");
String s2 =new String ("javabychetan");

        System.out.println(s1==s2) ;             output is false

        System.out.println(s1.equals(s2)) ;           output is true