Interview Question: What is lazy loading?

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Question:What is lazy loading?


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 ( == null) { = new Vector();
// Load data into vector …
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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