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 is built in Java class?

In Java, all classes (built-in or user-defined) are (implicitly) subclasses of Object . Using an array of Object in the List class allows any kind of Object (an instance of any class) to be stored in the list. However, primitive types (int, char, etc) cannot be stored in the list.

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