Hashset java

// Java program to demonstrate working of HashSet
import java.util.*;
  
class HashSetDemo {
  
    // Main Method
    public static void main(String[] args)
    {
        HashSet<String> h = new HashSet<String>();
  
        // Adding elements into HashSet usind add()
        h.add("India");
        h.add("Australia");
        h.add("South Africa");
        h.add("India"); // adding duplicate elements
  
        // Displaying the HashSet
        System.out.println(h);
        System.out.println("List contains India or not:"
                           + h.contains("India"));
  
        // Removing items from HashSet using remove()
        h.remove("Australia");
        System.out.println("List after removing Australia:"
                           + h);
  
        // Iterating over hash set items
        System.out.println("Iterating over list:");
        Iterator<String> i = h.iterator();
        while (i.hasNext())
            System.out.println(i.next());
    }
}

Source: geeksforgeeks.org

Hashset usage

- HashSet can have null, order is not guaranteed
- HashSet is commonly used if you want to access elements randomly or store a list of items which cannot contain duplicate values

What is hashset in java

- HashSet can have null, order is not guaranteed

-2

Similar codes

1 vote122 views1 answer
Border bottom android xml
Java
30 votes132 views6 answers
Retrofit android
Java
0 vote115 views1 answer
Javafx listview get item index
Java
2 votes122 views2 answers
Spigot run task later
Java
9 votes138 views3 answers
Function in java
Java
67 votes131 views3 answers
For javascipt
Java
0 vote218 views1 answer
Ternary operator in java for null check
Java
2 votes127 views1 answer
Java random unique key
Java
1 vote118 views1 answer
Java jshell run string as code
Java
0 vote124 views1 answer
Join table in where clause criteria in java hibernate
Java