Interpreter Design Pattern

The interpreter pattern is used to interpret a passed-in object using a set of definitions.

//The interpreter interface
public interface StringInterpreter {
      public void interpret(String input);
}

//The interpreter class
public class CharToNumber implements Interpreter {
 
      public void interpret(String input) {
            String result = "";
            for (int i=0; i < input.length(); i++) {
                  char c = input.charAt(i);
                  if (c == 'A') {
                        result += "1";
                  } else if (c=='B') {
                        result += "2"
                  } else {
                         result += "9";
                  }
            }
      }    
}

//The Runner
public class interpterDemo {
      public static void main (String[] args) {
            Interpreter inter = new CharToNumber();
            inter.interpret("ABABAABBCCCC");
      }
}

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