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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
wait Vs sleep methods
sleep(): It is a static method on Thread class. It makes the current thread into the "Not Runnable" state for specified amount of time. During this time, the thread keeps the lock (monitors) it has acquired.

wait(): It is a method on Object class. It makes the current thread into the "Not Runnable" state. Wait is called on a object, not a thread. Before calling wait() method, the object should be synchronized, means the object should be inside synchronized block. The call to wait() releases the acquired lock.
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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].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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