program for convert number to word in java

class no_to_word
{
public static  void notoword(int n)
{
String once[]={"zero","one","two","three","four","five","six","seven","eight","nine","ten","eleven","twelve","thirteen","fourteen","fifteen","sixteen","seventeen","eighteen","nineteen","twenty",};
String tens[]={"twenty","thirty","forty","fifty","sixty","seventy","eighty","ninety"};
if(!(n<=1)&&(n>=100))
System.out.println("invalid");
else
{
if(n<20)
System.out.println(once[n]);
else
{
int i=n/10;
n=n%10;
if(n==0)
System.out.print(tens[i-2]);
else
System.out.println(tens[i-2]+" "+once[n]);
    }
}
    }
}