Lambda Expression

• Java lambda expression is treated as a function, so compiler does not create .class file.

• It helps to iterate, filter and extract data from collection.

• Lambda expression provides implementation of functional interface which has functional Interface.

• An interface which has only one abstract method is called declare an interface as functional interface.

• @FunctionalInterface, which is used to declare an interface as functional interface.

• (argument-list) -> {body}

• Argument-list: It can be empty or non-empty as well.
• Arrow-token: It is used to link arguments-list and body of expression.
• Body: It contains expressions and statements for lambda expression.