Java 8 Interview Questions and Answers

Answer:

So we can divide structure of Lambda expression to three parts:

1. Argument list or parameters

Lambda expression can have zero or more arguments. First part before '->' is called as argument list or parameters.

()->{System.out.println("Hello")}; //Without argument, will print hello

(int a)->{System.out.println(a)} //; One argument, will print value of a

(int a,int b)-> {a+b};//two argument, will return sum of these two integers

2. Array token (->)

3. Body

Body can have expression or statements.
If there is only one statement in body, curly brace is not needed and return type of the anonymous function is same as of body expression.
If there are more than one statements, then it should be in curly braces and return type of anonymous function is same as value return from code block, void if nothing is returned.

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