The LinkedHashSet.add()
method in Java is used to add elements to a LinkedHashSet
.
Table of Contents
- Introduction
add
Method Syntax- Examples
- Adding Elements to a LinkedHashSet
- Handling Duplicate Elements
- Conclusion
Introduction
The LinkedHashSet.add()
method is a member of the LinkedHashSet
class in Java. It allows you to add elements to a LinkedHashSet
. If the element is not already present in the set, it is added and the method returns true
; otherwise, it returns false
.
add Method Syntax
The syntax for the add
method is as follows:
public boolean add(E e)
- The method takes a single parameter
e
of typeE
, which represents the element to be added to theLinkedHashSet
. - The method returns a boolean value:
true
if the element was added to the set (it was not already present).false
if the element was not added (it was already present in the set).
Examples
Adding Elements to a LinkedHashSet
The add
method can be used to add elements to a LinkedHashSet
.
Example
import java.util.LinkedHashSet;
public class AddExample {
public static void main(String[] args) {
// Creating a LinkedHashSet of Strings
LinkedHashSet<String> animals = new LinkedHashSet<>();
// Adding elements to the LinkedHashSet
animals.add("Lion");
animals.add("Tiger");
animals.add("Elephant");
// Printing the LinkedHashSet
System.out.println("LinkedHashSet: " + animals);
}
}
Output:
LinkedHashSet: [Lion, Tiger, Elephant]
Handling Duplicate Elements
The add
method returns false
if the element is already present in the LinkedHashSet
.
Example
import java.util.LinkedHashSet;
public class DuplicateExample {
public static void main(String[] args) {
// Creating a LinkedHashSet of Strings
LinkedHashSet<String> animals = new LinkedHashSet<>();
// Adding elements to the LinkedHashSet
boolean added1 = animals.add("Lion");
boolean added2 = animals.add("Tiger");
boolean added3 = animals.add("Lion"); // Attempt to add a duplicate
// Printing the results of adding elements
System.out.println("Added Lion first time: " + added1);
System.out.println("Added Tiger: " + added2);
System.out.println("Added Lion second time (duplicate): " + added3);
// Printing the LinkedHashSet
System.out.println("LinkedHashSet: " + animals);
}
}
Output:
Added Lion first time: true
Added Tiger: true
Added Lion second time (duplicate): false
LinkedHashSet: [Lion, Tiger]
Conclusion
The LinkedHashSet.add()
method in Java provides a way to add elements to a LinkedHashSet
. By understanding how to use this method, you can efficiently manage collections of unique elements in your Java applications. The method ensures that no duplicate elements are added to the set, maintaining the uniqueness of the elements.