Java implemented number wording translator

gistfile1.java

public class NumberWordingTranslator {

	private final static String[] hundredWords={
		"Zero", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine",
		"Ten", "Eleven", "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen", "Seventeen", "Eighteen", "Nineteen",
		"Twenty", null, null, null, null, null, null, null, null, null,
		"Thirty", null, null, null, null, null, null, null, null, null,
		"Forty", null, null, null, null, null, null, null, null, null,
		"Fifty", null, null, null, null, null, null, null, null, null,
		"Sixty", null, null, null, null, null, null, null, null, null,
		"Seventy", null, null, null, null, null, null, null, null, null,
		"Eighty", null, null, null, null, null, null, null, null, null,
		"Ninety", null, null, null, null, null, null, null, null, null,
		"Hundred"
	};
	
	private final static int[] places={1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 100000000};
	
	public static String translateToDigitWords(int number) {
		StringBuffer str=new StringBuffer();
		int numTemp=number;
		int placeIndex=places.length-1;	
		while(numTemp>0)
		{
			int mod=numTemp%places[placeIndex];			
			int digit=(numTemp-mod)/places[placeIndex];			
			placeIndex--;
			
			if(str.length()==0 && digit==0) continue;
			
			str.append(hundredWords[digit]);
			str.append(" ");			
			numTemp=numTemp-(numTemp-mod);			
		}		
		if(str.length()>0)
			str.deleteCharAt(str.length()-1);		
		return str.toString();
	}
	
	
	
	public static String translateToNumberWords(int number) {				
		
		StringBuffer str=new StringBuffer();			
				
		if(number>=1000000 && number<1000000000)
		{
			int mod=number%1000000;
			int restNumber=(number-mod)/1000000;
			str.append(translateToNumberWords(restNumber));
			str.append(" Million ");
			str.append(translateToNumberWords(mod));
			return str.toString();
		}
		
		if(number>=1000 && number<1000000)
		{
			int mod=number%1000;
			int restNumber=(number-mod)/1000;
			str.append(translateToNumberWords(restNumber));
			str.append(" Thousand ");
			str.append(translateToNumberWords(mod));
			return str.toString();
		}
		if(number>=100 && number<1000)
		{
			int mod=number%100;
			int restNumber=(number-mod)/100;
			str.append(translateToNumberWords(restNumber));
			str.append(" Hundred ");
			str.append(translateToNumberWords(mod));
			return str.toString();
		}
		if(number>=20 && number<100)
		{
			int mod=number%10;
			int restNumber=number-mod;
			str.append(hundredWords[restNumber]);
			str.append(" ");
			str.append(translateToNumberWords(mod));
			return str.toString();
		}
		if(number>0 && number<20)
		{		
			str.append(hundredWords[number]);
			return str.toString();
		}
		
		return str.toString();
	}
}