Compare 2 string within DECODE

Hi All,
Is there anyone else able to guide me on how to compare 2 strings inside DECODE function? Currently I need to check whether string1 = string2.
I need a DECODE function which has similar function like below,
eg: IF(string1 = String2? 1, 2) => java code

DECODE(string1,string2,1,2)If string1=string2 then 1 will be returned else 2 will be returned.

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