Difference in if statements

[mental hinge]

Hey hey, what exactly is the different between

(someVariable == someValue)
(someVariable.equals(someValue))
(someVariable.equalsIgnoreCase(someValue))

[zinc parrot]

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[molten kettle]

== used with objects only compares by reference equality, e.g.

"a" == new String("a") // false

because they both are different objects in memory.
obj1.equals(obj2) calls the equals() implementation of obj1, which for Strings checks if they contain the same characters in the same order.
equalsIgnoreCase() is a method of the String class which checks if both Strings contain the same characters using the UTF-16 or Latin-1 casing rules to identify uppercase with lowercase charactes. It does not take Locales into account (e.g. dotless vs dotted i are all seen the same)

"a".equals("A") // false
"a".equalsIgnoreCase("A") // true

[mental hinge]

Thanks for that great explanation! Do I get this right, the difference between .equals and equals Ignore Case is just that the second one doesn't care about uppercase / lowercase letters?

[zinc parrot]

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[molten kettle]

Yes, just as the method name says. Note that equals is a general method on any Object though while equalsIgnoreCase is only available on Strings.

[mental hinge]

Thanks. Makes sense, an intrger doesn't have upper numbers xd