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
When to use LinkedList or ArrayList?
Accessing elements are faster with ArrayList, because it is index based. But accessing is difficult with LinkedList. It is slow access. This is to access any element, you need to navigate through the elements one by one. But insertion and deletion is much faster with LinkedList, because if you know the node, just change the pointers before or after nodes. Insertion and deletion is slow with ArrayList, this is because, during these operations ArrayList need to adjust the indexes according to deletion or insetion if you are performing on middle indexes. Means, an ArrayList having 10 elements, if you are inserting at index 5, then you need to shift the indexes above 5 to one more.
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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java is registered trademark of Oracle.
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