codewars061 - Resistor Color Codes

Instructions

https://www.codewars.com/kata/resistor-color-codes/train/java

Solution:

import java.util.HashMap;
import java.util.Map;
public class DecodeResistorColors {

	private static Map<String,String> map = new HashMap<String, String>();
	
	static {
		map.put("black", "0");
		map.put("brown", "1");
		map.put("red", "2");
		map.put("orange", "3");
		map.put("yellow", "4");
		map.put("green", "5");
		map.put("blue", "6");
		map.put("violet", "7");
		map.put("gray", "8");
		map.put("white", "9");
		map.put("gold", "5%");
		map.put("silver", "10%");

	}
	private static String third(String power){
		int count = Integer.valueOf(power);
		StringBuilder sb = new StringBuilder();
		for(int i = 0; i < count; i++){
			sb.append("0");
		}
		return sb.toString();
	}
	public static String decodeResistorColors(String bands){
		String[] arr = bands.split(" ");
		String temp = map.get(arr[0]) + map.get(arr[1]) + third(map.get(arr[2]));
		Float num = Float.valueOf(temp);
		String suffix = "";
		if(num >= 1000 && num < 1000000){
			num = num / 1000;
			suffix = "k";
		}else if(num >= 1000000){
			num = num / 1000000;
			suffix = "M";
		}
		StringBuilder sb = new StringBuilder();
		String str = String.valueOf(num);
		str = str.replaceAll("\\.0", "");
		sb.append(str);
		sb.append(suffix);
		sb.append(" ohms, ");
		if(arr.length == 4){
			 sb.append(map.get(arr[3]));
		}else{
			sb.append("20%");
		}
	   		
		return sb.toString();
	}

}

Sample Tests:

https://www.codewars.com/kata/resistor-color-codes/train/java