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EJB Interview Questions and Answers

Ques. What is lazy loading?
Ans. Lazy loading means not creating an object until the first time it is accessed. Lazy loading typically looks like this:

public class Example {
private Vector data = null;
public Vector getData() {
if (this.data == null) {
this.data = new Vector();
// Load data into vector
return this.data;

This technique is most useful when you have large hierarchies of objects (such as a product catalog). You can lazy-load subordinate objects as you navigate down the hierarchy, and thereby only create objects when you need them.
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