Java Puzzle – private fields

Will following program work ?

class MyClass 
{
	private int privateId = 101;
	public static void main(String[] args) 
	{
		System.out.println("Hello World!");
		new MyClass().doStuff(new MyClass());
	}
	public void doStuff(MyClass obj){
		//accessing private instance variable
		System.out.println(obj.privateId);
	}
}
  































Comments









  1. Neil GhoshNovember 16, 2010 at 11:39 AM
    Oh Yes definitely
    ReplyDelete
  2. Yogesh DevatrajNovember 17, 2010 at 7:45 AM
    Neil you are 100% right .
    ReplyDelete
  3. Yogesh DevatrajNovember 17, 2010 at 7:50 AM
    Many other are also able to catch it.
    Actually Any private fields can be accessed by instance of same class in the same class.
    ReplyDelete











Post a Comment






























Popular posts from this blog









Composite Design Pattern by example




















Image







This post explains Composite design pattern with an example.   When to use ?  – Use Composite pattern when you have treat a collection of objects as they were once one thing. With Composite design pattern it is very easy to simplify operations over collection data structure. It reduces complexity of the code required if you were going to handle collection as special case.   How to Use?  - The Composite pattern consist of Component, Leaf and Composite Classes as shown below class diagram   Component  – Component declares the common interface that both the single and composite nodes will implements   Leaf  – The leaf class represent the singular atomic data type implementing he component interface.           Composite  – Composite is an abstract entity which declares common functionality which are needed by concrete implementation for handling collection data.   An Example -             Item.java   public interface Item {         public double getPrice();      }       ColdDrink.java   pu








Read more










State Design Pattern by Example




















Image







State pattern  falls under the category of Behavioral  patterns. State design pattern comes in picture when a system’s behavior is depends on its own state or some other resource’s state. If an implementation is depends on the states, we end up with snarl of conditional statement every where in code. A very neat approach to deal with such situation is to separate out every state’s behavior and use them where ever they are applicable.   The state pattern allows an object to alter its behavior when is internal state changes . The object is appeared to change its class.   State pattern is a way to implement the same.   Class Diagram :    As above class diagram shows, System class holds state instance. As state of system changes , all handle request delegated to respective State’s concrete implementation.   Example : Have an example of Vending machine. Vending machine has following states      No Coin Inserted     Coin Inserted     Dispensing     Empty    Following diagram explain behavior








Read more










Eclipse command framework core expression: Property tester




















Image







  Addition to Eclipse command framework series, this post explains use of property tester to control command’s enable/visible properties. In earlier post we have tried declarative way to achieve same thing but property tester gives us more control.   Property tester is associated with, tester class which implements PropertyTester.java, a namespace and set of property which it supports. We can refer this property tester using its namespace + a property name. It gives you call back to test() method with property name as parameter inside property tester class. We can configure property tester for type of input parameter.   Here is sample declaration of property tester extension point     < extension          point ="org.eclipse.core.expressions.propertyTesters" >       < propertyTester             class ="com.example.advance.cmd.EditorTester"             id ="com.example.advance.cmd.propertyTester1"             namespace ="com.example.advance.cm








Read more