Static Nested Classes
A nested class that is declared static
is called a static nested class. Memory to the objects of any static nested classes
are
allocated independently of any particular outer class object. A static nested class use
the instance variables or methods defined in its enclosing class only through an object
reference. A static nested class interacts with the
instance members of its outer class or any other class just like a top-level
class.
Given below is the syntax of the Static nested class
that defines static nested class having keyword static in the outer class.
class OuterClass {
....
static class StaticNestedClass {
....
}
class InnerClass {
....
}
} |
Static nested classes can be
accessed by using the enclosing class name:
| OuterClass.StaticNestedClass |
If we want to make an object of the static
nested class then we have to write down the following code:
|
OuterClass.StaticNestedClass nestedObject = new
OuterClass.StaticNestedClass();
|
Here is an example of the Static
nested class that processes of accessing the instance of the outer class inside
the inner class. The example creates an "Outer" class
with an instance x of value 100 and after that we call this value in inner class
method check. Apart from that the example also creates another function check and call the
inner class check() method inside it. When the example calls the check() with Outer
class, it shows the value of Outer class instance x.
Here is the code of the Example :
Outer.java
import java.lang.*;
public class Outer{
int x = 100;
class Inner{
int x = 200;
public void check(){
System.out.println("Value of x is: "+ Outer.this.x );
}
}
public void check(){
new Inner().check();
}
public static void main(String args[]){
new Outer().check();
}
}
|
Here is the output of the Example :
C:\roseindia>javac
Outer.java
C:\roseindia>java Outer
Value of x is: 100
|
Download this Example:
The advantage of a static nested
class is that it doesn't need an object of the containing class to work.
This can help you to reduce the number of objects your application creates at
runtime.
|
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