Java 8 - KNOWARTH

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By Dinesh Radadiya

Java 8

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Lambda Expressions

Default Methods

Date & Time API

Streams

Nashorn JavaScript Engine

PermGen to Metaspace

Agenda

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Lambda Expression

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It is similar to method; it has Arguments, a Body and Return type.

It also called as anonymous methods, A method without name.

It enables passing a Method as an argument to another Method.

What is Lambda Expression?

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Why do we need Lambda Expression ?

Reduced Line of Code.

Sequential and Parallel Execution Support.

Passing Behaviours into Methods.

Replace anonymous class.

More readable and reusable code.

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Sample Code

Lambda Expression

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Default Methods

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It is possible to add method bodies into Interfaces!

What is Default Methods?

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Why we need Default Methods?

What about Multiple Inheritance?

Now what are the Different between Abstract class and

Inheritance?

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Date & Time API

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Java Date & Time are not defined consistently.

There are no clearly defined classes for time, timestamp,

formatting and parsing.

All the Date classes are mutable, so they are not thread

safe.

Date class doesn’t provide internationalization, there is no

Time-Zone support.

Why do we need new Date & Time API?

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Immutability.

Separation of Concerns.

Clarity

Utility Operations

Expendability

What are the new features?

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Sample Code

Date & Time

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Streams(java.util.stream)

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For Internal Iteration.

It has various Filtering and mapping methods which increase

efficiency

Why it is required?

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Before Java 8

After Java 8

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Nashorn JavaScript Engine

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Ability to communicate to java directly.

It can be used java using “javax.script” API

It also can be used new command line tool jjs.

It support Full JavaFx

Features

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PermGen To Metaspace

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This memory space is completely removed.

No more java.lang.OutOfMemoryError: PermGen.

The PermSize and MaxPermSize JVM arguments are ignored

and a warning is issued if present at start-up

PermGen Space

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Class metadata are now allocated to available native

memory.

MaxMetaspaceSize

Dynamically re-size at runtime.

Metaspace

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THANK YOU

Java 8 - KNOWARTH

Technology

Transcript of Java 8 - KNOWARTH