Convert Between Base 10, Base 62, Base 36, Base 16, Base 8, Base 2 in Java

I've already written how you can Convert Between Base 10 and Base 62 in PL/SQL, and in this post I'll show you how to convert between base 10 and base 62 in Java. Well, actually you can pretty much convert between anything you want using the Java utility class below. Enjoy!

package org.javaconfessions.baseconverter;


public class BaseConverterUtil {

    private static final String baseDigits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";

    public static String toBase62( int decimalNumber ) {
        return fromDecimalToOtherBase( 62, decimalNumber );
    }

    public static String toBase36( int decimalNumber ) {
        return fromDecimalToOtherBase( 36, decimalNumber );
    }

    public static String toBase16( int decimalNumber ) {
        return fromDecimalToOtherBase( 16, decimalNumber );
    }

    public static String toBase8( int decimalNumber ) {
        return fromDecimalToOtherBase( 8, decimalNumber );
    }

    public static String toBase2( int decimalNumber ) {
        return fromDecimalToOtherBase( 2, decimalNumber );
    }

    public static int fromBase62( String base62Number ) {
        return fromOtherBaseToDecimal( 62, base62Number );
    }

    public static int fromBase36( String base36Number ) {
        return fromOtherBaseToDecimal( 36, base36Number );
    }

    public static int fromBase16( String base16Number ) {
        return fromOtherBaseToDecimal( 16, base16Number );
    }

    public static int fromBase8( String base8Number ) {
        return fromOtherBaseToDecimal( 8, base8Number );
    }

    public static int fromBase2( String base2Number ) {
        return fromOtherBaseToDecimal( 2, base2Number );
    }

    private static String fromDecimalToOtherBase ( int base, int decimalNumber ) {
        String tempVal = decimalNumber == 0 ? "0" : "";
        int mod = 0;

        while( decimalNumber != 0 ) {
            mod = decimalNumber % base;
            tempVal = baseDigits.substring( mod, mod + 1 ) + tempVal;
            decimalNumber = decimalNumber / base;
        }

        return tempVal;
    }

    private static int fromOtherBaseToDecimal( int base, String number ) {
        int iterator = number.length();
        int returnValue = 0;
        int multiplier = 1;

        while( iterator > 0 ) {
            returnValue = returnValue + ( baseDigits.indexOf( number.substring( iterator - 1, iterator ) ) * multiplier );
            multiplier = multiplier * base;
            --iterator;
        }
        return returnValue;
    }

}