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MysticVegeta

Fri Dec 16, 2005 12:11 pm


String problem... again..

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


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Tony

Fri Dec 16, 2005 12:41 pm



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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


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wtd

Fri Dec 16, 2005 2:50 pm



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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.


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Tony

Fri Dec 16, 2005 3:34 pm



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:)


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MysticVegeta

Fri Dec 16, 2005 4:29 pm



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


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wtd

Fri Dec 16, 2005 6:27 pm



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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.