What is the LinkedList.set method in Java?
LinkedList
Linked List is a collection of linear data elements. Each element (or node) contains a data part and a reference part.
The data part has the value and the reference part has the address link to the next element.
The elements are not indexed, so random access like in an array is not possible. Instead, we traverse from the beginning of the list and access the elements.
In Java, the LinkedList is the LinkedList class is present in the java.util package.
What is the set method of LinkedList class?
The set method can be used to set/replace the element at the specified index with the specified element in the LinkedList.
Syntax
public E set(int index, E element)
This method takes the index and the element to be replaced as an argument.
This method returns the previous element at the specified index of the list.
The IndexOutOfBoundsException exception is thrown if the index is negative or greater than the list size (index < 0 || index >= size()).
Code
The code below demonstrates how to use the set method:
import java.util.LinkedList;class LinkedListSetExample {public static void main( String args[] ) {LinkedList<String> list = new LinkedList<>();list.add("1");list.add("2");list.add("3");System.out.println("The list is " + list);System.out.println("The old element at index 0 " + list.set(0, "10"));System.out.println("The list is " + list);}}
Explanation
In the above code:
-
In line number 1, we import the
LinkedListclass. -
In line number 4, we create a
LinkedListobjects with the namelist. -
From line number 5 to 7, we use the
addmethod of thelistobject to add three elements ("1","2","3") to the list. -
In line number 10, we use the
setmethod of thelistobject to replace the element at index0with the element"10". Thesetmethod replaces the first element with"10"and returns the old element"1".
