RGBConverter.java

public class RGBConverter {
	
	public static class RGBCode{
		
		public int red;
		public int blue;
		public int green;
		
		public RGBCode(int red, int blue, int green){
			this.red = red;
			this.blue = blue;
			this.green = green;
		}
	}
	
	/**
	 * 
	 * Decimal -> Hexadecimal
	 *	0	0
	 *	1	1
	 *	...
	 *	9	9
	 *	10	A
	 *	11	B
	 *	12	C
	 *	13	D
	 *	14	E
	 *	15	F
	 */
	
	public static  int hexToInt(char a, char b){
	    int x = a < 65 ? a-48 : a-55;
	    int y = b < 65 ? b-48 : b-55;
	    return x*16+y;
	}
	
	public static int[] getRGB(String rgb){
	    int[] ret = new int[3];
	    for(int i=0; i<3; i++){
	        ret[i] = hexToInt(rgb.charAt(i*2), rgb.charAt(i*2+1));
	    }
	    return ret;
	}
	
	public static void main(String[] args) {
		// sample input
		String input = "#444444";
		
		// remove possible hashmark "#", any other characters.
		String hexString = input.replaceAll("[^A-Za-z0-9]", "");
				
		// get a 3 element array of integers
		int[] rgbCodes = getRGB(hexString);
		
		// pass in values to constructor
		RGBCode rgbCode = new RGBCode(rgbCodes[0],rgbCodes[1],rgbCodes[2]);
		System.out.println("red = "+rgbCode.red);
		System.out.println("blue = "+rgbCode.blue);
		System.out.println("green = "+rgbCode.green);
			
	}
}