Java 8 New Features Tutorials - 08 : Method reference | Static Method Reference | Part - 1
In this video we are discussing about Method Reference .
Types of Method References :
Static Method Reference
Non Static Method Refrence
Bound Reciever
Unbound Reciever
Constructor Reference
This Refrence
Super Reference
Functional Interface : • Java 8 New Features Tutorials - 01 : ...
Lambda Expression Part -1 : • Java 8 New Features Tutorials - 04 : ...
Lambda Expression Part -2 : • Java 8 New Features Tutorials - 05 : ...
Lambda as Method parameter : • Java 8 New Features Tutorials - 06 : ...
Passing Lambda function as Method parameter :
static predicateCheck(int a, MyPredicate ref){
ref.test(a);
}
Case- 1 :
MyPredicate pred =(a)-a%2==0;
predicateCheck(10, pred);
Case- 2 :
predicateCheck(10, (a)-a%2==0);
Problem Statement :
we have a list of interger and wanted to perform some operations
1 - Sum of all numbers
2 - Sum of all Even Numbers
3 - Sum of all Odd Numbers
Lambda Expression is enabling Functional Programming in java 8.
Through Lambda Expression we can pass block of code as parameter of a method.
Lambda Expression is also known as Method Anonymous implementation.
Lambda Supports Higher Order Function implementation and Lazy Evaluation methods.
Lambda Expression :
Block of code which take some inputs and return output.
Enabling Functional Programming.
Anonymous Method implementation.
Pre-Condition :
can work on FunctionalInterface only
Pro :
More readable code
Store block of code in a variable
we can pass an implentation as an argument of a method
Cons : in some cases we dont get methods in IDE
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Lambda Expression Syntax :: (args)-{stmnt};
==========================================================
Lambda Expression works with Functional Interface only .
Case -1 :a) No Method Argument with no return type (void method_name();)
b) No Method Argument with return type (R method_name();)
Case -2 :a) One Method Argument with no return type (void method_name(T t);)
b) One Method Argument with return type (R method_name(T t);)
Case -3 :a) More Than One Arguments with no return type (void method_name(args...);)
b) More Than One Arguments with return type (R method_name(arg..);)
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