How to do base conversion using library method in Java?

Problem Description :

Write a program in Java that converts the Decimal number to Binary, Octal and Hexadecimal numbers using a library function.

Base conversion using library method

Concept :

We are using following methods of Integer class.

• public static String toBinaryString(int decimal); 
• public static String toOctalString(int decimal);
• public static String toHexString(int decimal);

Java Program :

	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;
	}
	}

view raw DecimalToOtherBaseUsingIntegerClass.java hosted with ❤ by GitHub

Output :

Output - How to do base conversion using library function in Java?

References :

https://docs.oracle.com/javase/7/docs/api/java/lang/Integer.html

https://docs.oracle.com/javase/7/docs/api/java/lang/Integer.html#parseInt(java.lang.String)

https://docs.oracle.com/javase/7/docs/api/java/lang/Integer.html#toBinaryString(int)

https://docs.oracle.com/javase/7/docs/api/java/lang/Integer.html#toHexString(int)

https://docs.oracle.com/javase/7/docs/api/java/lang/Integer.html#toOctalString(int)

Thank you friends, I hope you have clearly understood the solution of this problem. If you have any doubt, suggestion or query please feel free to comment below. You can also discuss this solution in our forum.

Tags : Conversion problems, Decimal to Binary, Decimal to Octal, Decimal to Hexadecimal, Solution in Java, String, Integer, if else statement.

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