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

46 votes336 views2 answers
Java how to print an array
Java
1 vote374 views1 answer
Internal Exception: java.sql.SQLSyntaxErrorException: Table 'sql4409754.SEQUENCE' doesn't exist Error Code: 1146
Java
-1 vote337 views1 answer
Compile java code with package in cmd
Java
0 vote330 views1 answer
Strictfp java example
Java
1 vote301 views1 answer
Latest dependency for snackbar android
Java
1 vote402 views4 answers
Get last day of month java
Java
1 vote313 views1 answer
Overload and override in java
Java
0 vote344 views1 answer
Create EntityManager Hibernate
Java
1 vote332 views1 answer
How to draw a rectangle in libgdx
Java
0 vote336 views2 answers
How to remove null values collections
Java