Nested loops

Introduction

A nested loop is simply just more than one loop inside another; this may sound complicated but after you start using nested loops it will seem like second nature. The best way to start learning about nested loops is to look at an example using matrices.

Example Program

/**********************************
* NestedX:
* Prints out a fancy "ascii art"
* picture in the shape of an X where
* the user supplies the size of the X.
***********************************/

import javax.swing.*;

public class NestedX
{
	public static void main(String[] args)
	{
		int size = 0;
		int i, j;

		// Keep asking for input until it is greater or equal to 3.
		while(size < 3)
		{
			size = Integer.parseInt(JOptionPane.showInputDialog("Enter a number greater or equal to 3"));
		}

		for(i = 0; i < size; i++)
		{
			for (j = 0; j < size; j++)
			{
				if(i == j)
				{
					System.out.print("*");
				}
				else if(j == (size - (i + 1)))
				{
					System.out.print("*");
				}
				else
				{
					System.out.print(" ");
				}
			}
			System.out.println();
		}

		System.out.println("\n~~~End of processing~~~");
		System.exit(0);

	}// end main
}// end NestedX

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