Java Collection, HashSet Exercises: Get the number of elements in a hash set

Java Collection, HashSet Exercises: Exercise-3 with Solution

Write a Java program to get the number of elements in a hash set.

Sample Solution:

Java Code:

import java.util.*;
import java.util.Iterator;
  public class Exercise3 {
  public static void main(String[] args) {
         // Create a empty hash set
     HashSet<String> h_set = new HashSet<String>();
   // use add() method to add values in the hash set
    System.out.println("Original Hash Set: " + h_set);
    System.out.println("Size of the Hash Set: " + h_set.size());

Sample Output:

Original Hash Set: [Red, White, Pink, Yellow, Black, Green]            
Size of the Hash Set: 6 

Pictorial Presentation:

Java Collection, ArrayList Exercises: Get the number of elements in a hash set


Flowchart: Get the number of elements in a hash set.

Java Code Editor:

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What is the difficulty level of this exercise?

Java: Tips of the Day

Choice between Float and Double:

Data type Bytes used Significant figures (decimal)
Float 4 7
Double 8 15

Double is often preferred over float in software where precision is important because of the following reasons:
Most processors take nearly the same amount of processing time to perform operations on Float and Double. Double offers far more precision in the same amount of computation time.

Ref: https://bit.ly/3oj7K2K