Introduction to Nested Class

This section contains the description about Nested Class in java

Introduction to Nested Class

The Nested classes are classes which are defined within another class. A nested class has access to the members including private members of the class in which it is reside. But the enclosing class does not have access to the members of the nested class. 

Nested classes are of two types :

1. Static

2. Non-static

Static nested class : The nested class which is defined with 'static' modifier is known as 'static nested class'. Static nested class can access the member of it's enclosing class through an object. It can't access these member directly.

Non-Static nested class : The non-static nested class or  inner class  has access to all the members of it's enclosing class or outer class directly in the same way that other non-static member of outer class do.

Example : Simple inner class

class Outer {
	int x = 100;

	void test() {
		Inner inner = new Inner();
		inner.display();
	}

	// Inner Class
	class Inner {
		void display() {
			System.out.println("display : x = " + x);
		}
	}

}

public class SimpleInnerClass {
	public static void main(String args[]) {
		Outer outer = new Outer();
		outer.test();
	}

}

Output :

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