JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Program: How to access top level class variables from static member classes?


Description:
Since static code does not have a this reference, you can not access
instance variable of a top level class. You can only access static
members of a top level class.

Code:
package com.java2novice.nested.classes;

public class MyStatMemClassAcsVars {
	
	public static String staticVar = "You can access me!!!";
	private String privVar = "You cannot access me";
	
	public static class ChildClass{
		
		public void myMethod(){
			//you can access all static members of 
			//top level class
			System.out.println(staticVar);
			//you cannot access instance members of
			//top level class
			//below line gives compile error
			//System.out.println(privVar);
		}
	}
	
	public static void main(String a[]){
		MyStatMemClassAcsVars.ChildClass cc = new MyStatMemClassAcsVars.ChildClass();
		cc.myMethod();
	}
}

Output:
You can access me!!!
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Java Nested Classes Sample Code Examples

  1. How to initialise or call a static member class?
  2. How to implement a static member interface?
  3. How to access top level class variables from static member classes?
  4. Give an example of basic non-static member class.
  5. How to initialise non-static member (local class) class?
Knowledge Centre
What is abstract class or abstract method?
We cannot create instance for an abstract class. We can able to create instance for its subclass only. By specifying abstract keyword just before class, we can make a class as abstract class.

public abstract class MyAbstractClass{

}

Abstract class may or may not contains abstract methods. Abstract method is just method signature, it does not containes any implementation. Its subclass must provide implementation for abstract methods. Abstract methods are looks like as given below:

public abstract int getLength();
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected] or you can comment on the page.

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java is registered trademark of Oracle.
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