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1 Answer(s)      8 years ago
Posted in : Java Beginners
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September 10, 2008 at 4:28 PM


Many. A design patterns at least 250 existing are used in Object oriented world, including Spaghetti which refers to poor coding habits. The 23 design patterns by GOF(Gang Of Four) are well known, and more are to be discovered on the way.

As software developers design and build different applications, we come across the same or similar problem domains. This leads us to find a solution for the same/similar problem everytime, and we end up "reinventing the wheel" again and again.

The use of design patterns related to J2EE applications offer the added advantage of providing solutions for J2EE platform technologies.


This is code of using thread

public class ThreadTest{
public static void main(String[] args){
Thread th = new Thread();
System.out.println("Numbers are printing line by line : ");
for(int i = 1;i <= 10;i++)
catch(InterruptedException e){


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