?
Solved

nested class vs inner class

Posted on 2016-08-16
5
Medium Priority
?
116 Views
Last Modified: 2016-08-20
Hi,

What are differenced between nested class vs inner class. when and how and where we use each one. please advise
0
Comment
Question by:gudii9
  • 2
  • 2
5 Comments
 
LVL 14

Expert Comment

by:CPColin
ID: 41758794
There's no difference; the two terms mean the same thing.
0
 
LVL 28

Accepted Solution

by:
dpearson earned 1000 total points
ID: 41758828
To me "nested class" can mean either "static class" or "inner class".

So like this:
public class Outer {
   public static class StaticNested { }    // Note: "static" keyword here.  This is a static nested class.
}

public class Outer {
   public class Inner { }     // Can also be considered a non-static nested class
}

Open in new window


You asked a similar question a little while ago gudii9 about when to use these two and my advice was "always use the static version" - because they behave like normal classes.

Inner classes have special and confusing behaviors.  In my opinion they're a mistake in the Java language design and best avoided.

Doug
0
 
LVL 7

Author Comment

by:gudii9
ID: 41759476
To me "nested class" can mean either "static class" or "inner class".

so inner class means non static one right which is one kind of nested class right ? ( while static lass is other kind right?)
0
 
LVL 14

Assisted Solution

by:CPColin
CPColin earned 1000 total points
ID: 41759499
Looks like Doug is right. Per the language specification:
An inner class is a nested class that is not explicitly or implicitly declared static.
If you do GUI work, you'll become pretty familiar with inner (non-static) classes. If you use lambda expressions, you're secretly using inner classes, too. The key with them being non-static is that they can access stuff in the outer class, while static nested classes cannot.
0
 
LVL 7

Author Comment

by:gudii9
ID: 41763713
To me "nested class" can mean either "static class" or "inner class".

So like this:
public class Outer {
   public static class StaticNested { }    // Note: "static" keyword here.  This is a static nested class.
}

public class Outer {
   public class Inner { }     // Can also be considered a non-static nested class
}


above is clear
0

Featured Post

Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

For beginner Java programmers or at least those new to the Eclipse IDE, the following tutorial will show some (four) ways in which you can import your Java projects to your Eclipse workbench. Introduction While learning Java can be done with…
Introduction This article is the first of three articles that explain why and how the Experts Exchange QA Team does test automation for our web site. This article explains our test automation goals. Then rationale is given for the tools we use to a…
Viewers learn about the “for” loop and how it works in Java. By comparing it to the while loop learned before, viewers can make the transition easily. You will learn about the formatting of the for loop as we write a program that prints even numbers…
This tutorial covers a step-by-step guide to install VisualVM launcher in eclipse.

568 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question