String problem... again..

[MysticVegeta]

This is really weird. I dont know whats going on! I go soemthing like this

code:

String a = "abcde"; String ab = a.substring(1,2); System.out.println(ab); if (ab == "a") { System.out.println (a); //doesnt go here!!! }

Note: Pseudocode, anyways, what is the problem, ab = "a" but "a" not= ab? what the hell?

[Tony]

common mistake in Java.

ab is an object of class String, while "a" is a string native value.

== checks for equality, but Object instance is not the same as an instance of a value. You have to compare their content explicitly.

Something like ab.equals("a")

It's been a while since I've done Java

[wtd]

Tony wrote:

common mistake in Java.

ab is an object of class String, while "a" is a string native value.

Wrong.

Strings are always objects. The thing is, "==" on objects checks to see if they're exactly the same object, not that their contents are identical.

As mentioned, use the "equals" method.

[Tony]

[MysticVegeta]

omg you are joking!! I thought .equals and "==" meant the same! Why do they have to make it so confusing?!

[wtd]

MysticVegeta wrote:

omg you are joking!! I thought .equals and "==" meant the same! Why do they have to make it so confusing?!

Because there's no operator overloading.