Interview questions on java 8 Primitive Functions for experienced.

 Part 1

Interview questions on Java 8 Primitive Functions for experienced covered in this post:

    What are the primitive functions?

-          Primitives cannot use generic type argument, Java 8 has provided some primitives functions for performance improvement.

-          There are 15 primitive functions.

1.       IntFunction<R> :

§  If your input is always int primitive then we should use this function.

§  Method: R apply(int value);

2.       LongFunction<R>:

§  If your input is always long primitive then we should use this function.

§  Method: R apply(long value);

3.       DoubleFunction<R>:

§  If your input is always double primitive then we should use this function.

§  Method: R apply(double value);

4.       ToIntFunction<T>:

§  Input type can be anything but return type is always int.

§  Method: int applyAsInt(T value);

5.       ToLongFunction<T>:

§  Input type can be anything but return type is always long.

§  Method: long applyAsLong(T value);

6.       ToDoubleFunction<T>:

§  Input type can be anything but return type is always double.

§  Method: double applyAsDouble(T value);

7.       IntToLongFunction<T>:

§  Input type must Int and output type must long then we should use this function.

§  Method: long applyAsLong(int value);

8.       IntToDoubleFunction<T>:

§  Input type must Int and output type must double then we should use this function.

§  Method: double applyAsDouble(int value);

9.       longToIntFunction<T>:

§  Input type must long and output type must int then we should use this function.

§  Method: int applyAsInt(long value);

 

10.   longToDoubleFunction<T>:

§  Input type must long and output type must double then we should use this function.

§  Method: double applyAsDouble(long value);

11.   doubleToIntFunction<T>:

§  Input type must double and output type must int then we should use this function.

§  Method: int applyAsInt(double value);

12.   doubleToLongFunction<T>:

§  Input type must double and output type must long then we should use this function.

§  Method: long applyAsLong(double value);

13.   ToIntBiFunction<T,U>:

§  Method: int applyAsInt(T t, U u);

14.   ToLongBiFunction<T,U>:

§  Method: long applyAsLong(T t, U u);

15.   ToIntBiFunction<T,U>:

§  Method: int applyAsInt(T t, U u);

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    What is the difference between IntFunction, ToIntFunction and IntToDoubleFunction?

	IntFunction	ToIntFunction	IntToDoubleFunction
1.	If your input is always int primitive then we should use this function.	Input type can be anything but return type is always int.	Input type must be Int and output type must double then we should use this function.
2.	Method: R apply(int value);	Method: int applyAsInt(T value);	Method: double applyAsDouble(int value);

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• Basic Java Interview Questions and Answers - Click here

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• Interview questions on multithreading in java for experienced - Click here

• Interview questions on serialization in java for experienced - Click here

• Interview questions on inner class in java for experienced - Click here

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Upcoming questions in next post:

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