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.

Java program that converts decimal number to binary, octal and hexadecimal using library method.

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; } }

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)

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

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