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

0 vote213 views1 answer
How to use set ForceDarkAllowed(false); in android studio
Java
0 vote218 views1 answer
Activitycompat.requestpermissions not working
Java
1 vote208 views1 answer
Java create file
Java
0 vote199 views1 answer
Get all keys from pbject javascirpt
Java
0 vote211 views1 answer
Concat result of List to one text java
Java
0 vote205 views1 answer
Minecraft addlayer(u) in the type rendererlivingentity<t> is not applicable for the arguments
Java
150 votes292 views4 answers
How to scan a String in Java
Java
6 votes187 views1 answer
Set size of a jframe
Java
1 vote196 views1 answer
Internal Exception: java.sql.SQLSyntaxErrorException: Table 'sql4409754.SEQUENCE' doesn't exist Error Code: 1146
Java
0 vote201 views1 answer
Frequency of each element from list in java
Java