Java: Iterate through all elements in a hash list

Last update on May 22 2025 13:14:33 (UTC/GMT +8 hours)

2. Iterate HashSet Elements

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:

For more Practice: Solve these Related Problems:

• Write a Java program to iterate over a HashSet using an Iterator and print only the elements that satisfy a given condition.
• Write a Java program to iterate through a HashSet using Java 8 forEach() and a lambda expression, printing each element with its hash code.
• Write a Java program to convert a HashSet to a stream, filter the elements by a specific pattern, and then print the filtered results.
• Write a Java program to iterate over a HashSet, convert each element to uppercase, and collect the results into a new HashSet.

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