Java APIs

Question

can any one give me another useful api class?

Answer 1

I found this useful class
"Arrays" This class contains various methods for manipulating arrays (such as sorting and searching).
one of that methods called binarySearch(ine[] a, int key)
Searches the specified array of ints for the specified value using the binary search algorithm. and Of course it's a static methods

Answer 2

look at java documention at oracle website to get full explanation about Java api

Answer 3

thanks @Mahmoud Heretani