facebook: prints all possible string codes of given numeric string

CodingBlocks Training/Day11/codesOfString.java

@@ -0,0 +1,40 @@
+package Lecture11;
+
+public class codesOfString {
+
+	public static void main(String[] args) {
+
+		String inputStr = "1234";
+		printCodesOfString(inputStr, "");
+	}
+
+	public static void printCodesOfString(String str, String result) {
+		if (str.equals("")) {
+			System.out.println(result);
+			return;
+		}
+
+		String firstChar = str.substring(0, 1);
+		String restStr = str.substring(1);
+
+		char code1 = getCode(firstChar);
+
+		printCodesOfString(restStr, result + code1);
+
+		if (str.length() > 2) {
+			String twoChar = str.substring(0, 2);
+			String restStr2 = str.substring(2);
+
+			if (Integer.valueOf(twoChar) < 27) {
+				char code2 = getCode(twoChar);
+				printCodesOfString(restStr2, result + code2);
+			}
+		}
+	}
+
+	public static char getCode(String firstChar) {
+		int charValue = Integer.valueOf(firstChar);
+		int ascii = 96 + charValue;
+		return (char) ascii;
+	}
+}