concat

[Pratiti Naphade]

11. The statement ...
String s = "Hello" + "Java";
yields the same value for s as ...
String s = "Hello";
String s2= "Java";
s.concat( s2 );
True
False
why??
these things really confuse me...

[Bala Arul]

Hi Pratiti,
False.
i) String s = "Hello" + "Java"; yields "HelloJava" as the value of s.
ii) String s = "Hello";
String s2= "Java";
s.concat( s2 );
After all the above 3 statements executed, s still refer to the value "Hello". s.concat(s2) does not change the s's value, but return new String object whose value is "HelloJava"
Bala.

[kapil apshankar]

Hi Pratiti,
The '+' operator is inherently overloaded by Java for String objects.
Also the Java API defines a concat method for String objects which concatenates the specified string to the end of the first string.
The effect of both these is bound to be the same.
I guess because the overloaded '+' operator implicitly calls the concat() method of String objects.
So you can use either of these, as long as you are comfprtable with it.
Please correct me if I am wrong.
Cheers
Kapil