.equals ( ) and ==

[Himabindu Devulapalli]

Hi Java gurus.,
When should I use .equals() and == in Java.
Is .equals() used for String objects alone ?
Thanks in adv...
--Bindu

[Anonymous]

== does shallow comparison. Whereas .equals() does deep comparison only if you override this method. As the .equals() of Object class does the same thing as == does, need to override this method.
boolean equals(Object�obj) Indicates whether some other object is "equal to" this one.
Hope this helps!

[SaiRam NageshKumar]

Just execute the following to clear ur doubt. If u're not cleared dig it again. Try with & without the commented(//) statement.

[pre]
public class ex {
          public static void main(String args[]) {
                String str1 = "STRING ONE";
                String str3;
                str3 = new String("STRING ONE");
                a = str1;
                //str1 = str3;
                if(str1 == str3)
                System.out.println("== resulting!");
                else
                System.out.println("== not-resulting!");
                if(str1.equals(str3))
                System.out.println(".equals() resulting!");
                else
                System.out.println(".equals() not-resulting!");

          }
  }
[/pre]