# Very easy straightforward Java solution.

• ``````public class Solution {
public String numberToWords(int num) {
String[] di = new String[]{"Zero", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine"};
String[] ten = new String[]{"Ten", "Eleven", "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen", "Seventeen","Eighteen", "Nineteen"};
String[] tens = new String[]{"","","Twenty", "Thirty", "Forty", "Fifty", "Sixty", "Seventy", "Eighty", "Ninety"};
String[] e = new String[]{"Billion","Million","Thousand"};
int exp = 1000000000;
StringBuilder res = new StringBuilder();
if(num==0)return di[0];
for(int i=0;i<4;i++){
int tmp = num/exp;
num %= exp;
if(tmp>0){
int h=tmp/100;
int t=(tmp%100)/10;
int d=tmp%10;
if(h!=0)res.append(di[h]+" Hundred ");
if(t==1)res.append(ten[tmp%100-10]+" ");
else{
if(t!=0)res.append(tens[t]+" ");
if(d!=0)res.append(di[d]+" ");
}
if(i<3)res.append(e[i]+" ");
}
exp /= 1000;
}
return res.toString().trim();
}
}
``````

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