w3resource

Java Collection, HashSet Exercises: Iterate through all elements in a hash list

Java Collection, HashSet Exercises: Exercise-2 with Solution

Write a Java program to iterate through all elements in a hash list.

Sample Solution:

Java Code:

import java.util.*;
import java.util.Iterator;
  public class Exercise2 {
  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
          h_set.add("Red");
          h_set.add("Green");
          h_set.add("Black");
          h_set.add("White");
          h_set.add("Pink");
          h_set.add("Yellow");

  // set Iterator 
    Iterator<String> p = h_set.iterator();
  // Iterate the hash set
   while (p.hasNext()) {
   System.out.println(p.next());
   }
   }
}

Sample Output:

Red                                                                    
White                                                                  
Pink                                                                   
Yellow                                                                 
Black                                                                  
Green

Flowchart:

Flowchart: Iterate through all elements in a hash list.

Java Code Editor:

Contribute your code and comments through Disqus.

Previous: Append the specified element to the end of a hash set.
Next: Get the number of elements in a hash set.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.



Share this Tutorial / Exercise on : Facebook and Twitter

Java: Tips of the Day

getEnumMap

Converts to enum to Map where key is the name and value is Enum itself.

public static <E extends Enum<E>> Map<String, E> getEnumMap(final Class<E> enumClass) {
    return Arrays.stream(enumClass.getEnumConstants())
            .collect(Collectors.toMap(Enum::name, Function.identity()));
}

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