Originally posted by Chinmay Bajikar: What is the difference between how Vector.contains() searches in the vector and how Vector.indexOff() searches in the vector? Also which one is efficient??
From the source code of Vector:
You can see that Vector's contains() calls its two-argument indexOf() method. (And the single-argument version of indexOf() also calls the two-argument indexOf().) So they search the same way! Can't imagine that the extra method calls of contains() or single-argument indexOf() have any (measurable) performance impact. I'd base my decision between the two on which return type I need: contains() returns a boolean and indexOf() returns an integer index.
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