Added JAVA code to convert Number to Words

Number2Words/n2w.java

@@ -0,0 +1,84 @@
+import java.util.*;
+
+public class n2w {
+	static void convert_to_words(char[] num){
+		int len = num.length;
+		if (len == 0) {
+			System.out.println("empty string");
+			return;
+		}
+		if (len > 4) {
+			System.out.println(
+				"Length more than 4 is not supported");
+			return;
+		}
+		String[] single_digits = new String[] {
+			"zero", "one", "two", "three", "four",
+			"five", "six", "seven", "eight", "nine"
+		};
+		String[] two_digits = new String[] {
+			"",		 "ten",	 "eleven", "twelve",
+			"thirteen", "fourteen", "fifteen", "sixteen",
+			"seventeen", "eighteen", "nineteen"
+		};
+
+		String[] tens_multiple = new String[] {
+			"",	 "",	 "twenty", "thirty", "forty",
+			"fifty", "sixty", "seventy", "eighty", "ninety"
+		};
+
+		String[] tens_power
+			= new String[] { "hundred", "thousand" };
+		System.out.print(String.valueOf(num) + ": ");
+		if (len == 1) {
+			System.out.println(single_digits[num[0] - '0']);
+			return;
+		}
+		int x = 0;
+		while (x < num.length) {
+			if (len >= 3) {
+				if (num[x] - '0' != 0) {
+					System.out.print(
+						single_digits[num[x] - '0'] + " ");
+					System.out.print(tens_power[len - 3]
+									+ " ");
+				}
+				--len;
+			}
+			else {
+				if (num[x] - '0' == 1) {
+					int sum
+						= num[x] - '0' + num[x + 1] - '0';
+					System.out.println(two_digits[sum]);
+					return;
+				}
+				else if (num[x] - '0' == 2
+						&& num[x + 1] - '0' == 0) {
+					System.out.println("twenty");
+					return;
+				}
+				else {
+					int i = (num[x] - '0');
+					if (i > 0)
+						System.out.print(tens_multiple[i]
+										+ " ");
+					else
+						System.out.print("");
+					++x;
+					if (num[x] - '0' != 0)
+						System.out.println(
+							single_digits[num[x] - '0']);
+				}
+			}
+			++x;
+		}
+	}
+	public static void main(String[] args)
+	{
+	    Scanner sc = new Scanner(System.in);
+		String s;
+		System.out.println("Enter Number ->> ");
+		s = sc.nextLine();
+		convert_to_words(s.toCharArray());
+	}
+}