What is built in method?

A function which is already defined in a program or programming framework with a set of statements, which together performs a task and it is called Build-in function. So users need not create this type of function and can use directly in their program or application.

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What are Java library functions?

The Functional Java library provides the usual set of types for managing data like lists, sets, arrays, and maps . The key thing to realize is that these data types are immutable. Additionally, the library provides convenience functions to convert to and from standard Java Collections classes if needed.

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