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Lambda expressions in java 8

One of the key elements of the functional programing is that we can treat functions as objects. In a typical functional language we can have a variable with type of function. The benefits are that we can use functions as:

  • • parameter
  • • return type
  • • variable

The type Function in Java is interface with one abstract method. If we want to be sure that an interface can be used as a function type we can add annotation @FunctionalInterface before the header of the interface. It will throw compilation error if the interface contains more then one abstract method.

If a method has a parameter with function type we can use lambda expression instead of creating an anonymous class. Lambda expression represents an anonymous class in a shorter and readable way. Lambda expression consists from parameter definition, small right arrow “->”, and the body of the method.