Java 8

Introduction to new things in java 8.

Use link to see example of relevant title.

What is lambda expression ?

Lambda expression is nothing but an anonymous function.

Functional Interface

Functional Interface is an Interface having only one abstract method.

Default static method

Default static method method with default static and defined in an interface. 

Built in Functional Interface

java.util.function.*
java.util.function.Predicate
java.util.function.Consumer

Method Reference

Static Method Reference

list.forEach(p -> Person::getInfo)

Instance Method Reference

list.forEach(p -> personObject::getInfo)

Optional

Way to deal with null value.
java.util.Optional.of(new Person(23, "Sumit"))

Traveling Collection

forEach(Consumer con) method added to collection  

Stream API

Sequential Stream

Traveling and aggregating collection sequentially.
new ArrayList(). stream()

Parallel Stream

Traveling and aggregating collection parallel.
new ArrayList(). parallelStream()

Time API

//The Classes
java.util.Instance
java.util.Duration
java.util.LocalTime
java.util.LocalDate
java.util.LocalDateTime
java.util.DateTimeFormatter
java.util.DateTimeFormatterBuilder

Local Date and Time

Dealing with time and date without time zone information.

Date Formatter

How for format date and time using DateTimeFormatter ?

Zoned Time

Date and Time with zone information.

Introduction to Nashorn, a replacement for Rhino

//nashorn command line using jjs
Sumits-MacBook-Air:~ sumit$ jjs
jjs> var welcome = 'Welcome to Nashorn';
jjs> welcome 

Execute Js file using nashorn

How execute javscript file using nashorn ?

Improvements

String.join

Adding delimiter between string. join() static method on string. 

StringJoiner Class

Joining using  java.util.StringJoiner class. We can add delimiter, prefix, suffix

New Methods on Object class

Base64 class

New Method on collection