Decimal to Binary, Hexadecimal and Octal Converter

DecimalToOtherBaseUsingIntegerClass.java

package com.javamultiplex.baseconversion;

import java.util.Scanner;

/**
 * 
 * @author Rohit Agarwal
 * @category Base Conversion
 * @problem Convert Decimal to Binary, Octal and Hexadecimal
 */

public class DecimalToOtherBaseUsingIntegerClass {

	public static void main(String[] args) {

		Scanner input = null;
		try {
			input = new Scanner(System.in);
			System.out.println("Enter decimal number : ");
			String decimal = input.next();
			if (isDecimalNumber(decimal)) {

				int dec = Integer.parseInt(decimal);
				// Decimal to Binary conversion
				String binary = Integer.toBinaryString(dec);
				System.out.println("Binary number : " + binary);
				// Decimal to Octal conversion
				String octal = Integer.toOctalString(dec);
				System.out.println("Octal number : " + octal);
				// Decimal to Hexadecimal conversion
				String hexadecimal = Integer.toHexString(dec);
				System.out.println("Hexadecimal number : " + hexadecimal);
			} else {
				System.out.println("Please enter valid decimal number.");
			}
		} finally {
			if (input != null) {
				input.close();
			}
		}

	}

	private static boolean isDecimalNumber(String number) {

		// Regular expression that matches String containing only digits [0-9].
		String pattern = "^[0-9]+$";
		boolean result = false;
		if (number.matches(pattern)) {
			result = true;
		}
		return result;
	}

}