Basic Java 8 Features

Main Java 8 features: Lambda expressions, Stream API, and Date Time API explained.

Java Stream API with Lambda Operations[9]

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Lambda Expressions

Lambda expressions are inline functions. They provide a straightforward and concise approach to use an expression to represent one method interface. It helps to iterate, filter, and extract data from a collection. [1]

We employ lambda expressions in order to give a functional interface with minimal coding.[2]

Syntax[2]:

For a single line of code:

(parameter1, parameter2) -> expression

Or for multiple lines of codes:

(parameter1, parameter2) -> { 
  code block 
}

Constraints

There are a few limitations for expression. They must return a value immediately and cannot contain variables, assignments, or phrases like if or for. A code block containing curly brackets can be used to do more sophisticated actions..[2]

//Without lambda, Drawable implementation using anonymous class
Drawable d=new Drawable(){
  public void draw(){
   System.out.println(“Drawing “+width);
   }
});
d.draw();

//with lambda
Drawable d2=()->{
  System.out.println(“Drawing “+width);
};
d2.draw();

If there is only one statement, the return keyword may or may not be used. When a lambda expression contains several statements, you must use the return keyword.[1]

// Lambda expression without the return keyword.
Addable ad1=(a,b)->(a+b);
System.out.println(ad1.add(10,20));

// Lambda expression with return keyword.
Addable ad2=(int a,int b)->{
return (a+b);
};
//Example with collections
public static void…