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What is the Use of Inner classes

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Join Date: Apr 2008

Posts: 7

Reputation: painless is an unknown quantity at this point

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painless

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What is the Use of Inner classes

Jul 2nd, 2009

Can any one justify the use of inner classes with example(if possible)

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Join Date: Aug 2006

Posts: 2,065

Reputation: Ramy Mahrous is just really nice

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Ramy Mahrous Ramy Mahrous is offline

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Re: What is the Use of Inner classes

Jul 2nd, 2009

To be visible to just parent class.

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 C# Syntax (Toggle Plain Text) 
namespace Example
{
class Parent 
{
void Method()
{
Child c = new Child();//No error
}
class Child
{
}
}
class Painless
{
void Method()
{
Child c = new Child();//error
}
}
}
namespace Example
{
class Parent 
{
void Method()
{
Child c = new Child();//No error
}
class Child
{
}
}
class Painless
{
void Method()
{
Child c = new Child();//error
}
}
}

BI Developer | LINKdotNET
B.Sc Computer Science, Helwan University
Technical blog | http://ramymahrous.wordpress.com
LinkedIn | http://www.linkedin.com/in/ramymahrous

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Join Date: Apr 2008

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JamesCherrill JamesCherrill is offline

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Re: What is the Use of Inner classes

Jul 2nd, 2009

Sometimes you need an instance of a class - eg as a Listener for a Swing Event,, or a Runnable for a Thread - and these are most conveniently and compactly created locally as inner classes, often anonymous inner classes.