file.java

import java.util.*;
/**
 * LeetTranslator translates text into leetspeak
 */
public class LeetTranslator {
  public static void main(String[] args) {
    // Ask the user whether to convert between normal -> leet or leet -> normal
    Scanner scan = new Scanner(System.in);
    System.out.print("Type N to convert from (N)ormal text to Leetspeak, or L to convert from (L)eetspeak to Normal: ");
    String type = scan.nextLine().replace("\n", "").replace("\r", "");

    // Create the mapping between normal characters and leet speak
    Map<Character, Character> leetMap = new HashMap<Character, Character>();
    System.out.println(type == "N");
    if(type == "N") {
      leetMap.put('a', '@');
      leetMap.put('e', '3');
      leetMap.put('i', '1');
      leetMap.put('s', '5');
      leetMap.put('o', '0');
    }
    else if(type == "L") {
      leetMap.put('@', 'a');
      leetMap.put('3', 'e');
      leetMap.put('5', 's');
      leetMap.put('0', 'o');
      leetMap.put('1', 'i');
    }

    // Get the user input
    System.out.print("Enter text to translate: ");
    String input = scan.nextLine();
    String output = input;

    // Iterate over leetMap and replace characters in the string
    Iterator<Character> leetIterator = leetMap.keySet().iterator();
    while(leetIterator.hasNext()) {
      Character key = leetIterator.next();
      output = output.replace(key, leetMap.get(key));
    }

    System.out.println(output);
  }
}