Question

Write a Java program that is able to apply a hash function to a first and last name (key) of a person, and lookup the appropriate index in a hash table modeling a telephone directory. The telephone number (value) should be returned on doing a lookup (you can pre-populate the table with 20 entries for this purpose). You can use existing Java code (or libraries) to model the hash table, however, your program should be customized to use the hash table structure appropriately.

Demonstrate that your program works by providing meaningful console messages that walk the tester through the search function in the directory.

Call your primary tester file HashTableImplementation.java

Answer 1

Hi... The code for the above requirement is below.The Code is tested and verified.Pls add more console messages if required. If any more details are required, comment. Hit a "LIKE" if found useful

import java.util.*;
  
public class HashTableImplementation {
public static void main(String[] args)
{
  
// Creating an empty Hashtable
Hashtable<String,String> hash_table =
new Hashtable<String,String>();
  
// Putting values in the table
hash_table.put("Ram vare", "9600189673");
hash_table.put("Veer pin", "918876545");
hash_table.put("Sham lea", "789009123");
hash_table.put("Reyaan rea", "7899076543");
hash_table.put("Ryan pil", "786666666");
  
// Displaying the Hashtable
System.out.println("Initial Table is: " + hash_table);
  
// Display the Value
System.out.println("The telephone number is " + hash_table.get("Ram vare"));
  
  
  
}
}

Output

------

$javac HashTableImplementation.java

Initial Table is: {Sham lea=789009123, Ryan pil=786666666, Reyaan rea=7899076543, Veer pin=918876545, Ram vare=9600189673}
The telephone number is 9600189673