LeetTranslator.java

import java.util.*;
/**
 * LeetTranslator translates text into leetspeak
 */
public class LeetTranslator {
  public static void main(String[] args) {
    // Create the mapping between normal characters and leet speak
    Map<Character, Character> leetMap = new HashMap<Character, Character>();
    leetMap.put('a', '@');
    leetMap.put('e', '3');
    leetMap.put('i', '1');
    leetMap.put('s', '5');
    leetMap.put('o', '0');

    Scanner scan = new Scanner(System.in);
    System.out.print("Enter text to translate: ");
    String normalInput = scan.nextLine();
    String output = normalInput;

    Iterator leetIterator = leetMap.keySet().iterator();
    while(leetIterator.hasNext()) {
      Character key = (Character)leetInterator.next();
      output = output.replace(key, leetMap.get(key));
    }

    System.out.println(output);
  }
}