Hashtable Class in Java

April 6, 2022 Java

In this post, you will learn how to work with the Hashtable class so that you can use that same knowledge and thus evolve.

this class represents a collection of associations between pairs of values;
the first element of the pair is called the key (identifier) and the other is called the content;
the collection of associations between value pairs are organized according to the hash code of the key.

package com.caffeinealgorithm.programminginjava;

import java.util.Hashtable;

public class HashtableClass {
  private Hashtable<String, Integer> people = new Hashtable<>();

  public void Run() {
    people.put("Nelson Silva", 25);
    people.put("Larissa Fernandes", 37);
    people.put("Pedro Henrique", 52);
    people.put("Raquel Soares", 68);

    people.replace("Pedro Henrique", 100);
    people.remove("Larissa Fernandes");
    // people.clear();

    System.out.printf("Number of people: %s\n", people.keySet());
    System.out.printf("Age of people: %s", people.values());
  }
}

/*
  Number of people: [Nelson Silva, Raquel Soares, Pedro Henrique]
  Age of people: [25, 68, 100]
*/

Don’t forget to watch the video and you can always read this post in Portuguese.

Hashtable Class in Java

Happy coding!