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Object Reference Instance Variables
In the object Reference instance Variables are very diff , we can see in this code : 
public class Book {
private String title;
public String getTitle() {
return title;
public static void main(String [] args) {
Book b = new Book();
System.out.println("The title is " + b.getTitle());
The output of this code is : 
The title is null
           In this output title is not a explicitly initialised with a string assignment, so the instance variable value is null. 
Posted By: Name:Rajesh Kr URL: Object Reference Instance Variables