Pages

Tuesday, 14 February 2017

Chapter 27 Exercise 9, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

27.9 (Implement hashCode for string) Write a method that returns a hash code for string using the approach described in Section 27.3.2 with b value 31 . The function header is as follows:
public static int hashCodeForString(String s)


public class Exercise09 {
 public static void main(String[] args) {
  // Create a list if string
  String[] list = {"Mark", "Smith", "tops", "pots", "tod", "dot"};

  // Print the hash code for each string
  for (String e : list) {
   System.out.println("The hash code for \"" + e +
    "\" is " + hashCodeForString(e));
  }

 }

 /** Retrun the hash code for string */
 public static int hashCodeForString(String s) {
  int b = 31;
  int hashCode = 0;
  for (int i = 0; i < s.length(); i++) { 
   hashCode = b * hashCode + (int)s.charAt(i); 
  }
  return hashCode;
 }
}

No comments :

Post a Comment