Cracking the interview 19.8

gistfile1.txt

import java.util.Hashtable;

public class Question198
{
  public static Hashtable<String, Integer> createHashtable(String[] book) {
    Hashtable<String, Integer> table = new Hashtable<String, Integer>();
    for(int i = 0; i < book.length; i++) {
      book[i] = book[i].toLowerCase();
      if(book[i].trim() != "") {
        if( !table.containsKey(book[i])) {
          table.put(book[i], 1);
        } 
        else{
          table.put(book[i], table.get(book[i]) + 1);
        }
      }
    }
    return table;
  }
  
  public static int getFrequency(Hashtable<String, Integer> table, String word) {
    if( table == null || word == null) return -1;
    word = word.toLowerCase();
    if( table.containsKey(word)) {
      return table.get(word);
    }
    return 0;
  }
  
  public static void main(String[] args) {
    String[] book1 = {"This", "is", "a", "is", "case",};
    Hashtable<String, Integer> test1 = createHashtable(book1);
    String word1 = "is";
    String word2 = "a";
    String word3 = "case";
    System.out.println("Expected(2): " + getFrequency(test1, word1));
    System.out.println("Expected(1): " + getFrequency(test1, word2));
    System.out.println("Expected(1): " + getFrequency(test1, word3));
  }
  
}