Open In App

List clear() method in Java with Examples

Last Updated : 29 Nov, 2024
Comments
Improve
Suggest changes
1 Likes
Like
Report

The clear() method of List interface in Java is used to remove all of the elements from the List container. This method does not deleted the List container, instead it just removes all of the elements from the List. 

Example:

Java 
// Java Program to Demonstrate // List clear() import java.util.*; class Main  {  public static void main (String[] args)   {  // Created List  List<Integer> l=new ArrayList<Integer>();    // Adding Element  l.add(1);  l.add(2);    // Original List  System.out.println("Original : " + l);    // Clearing the List  l.clear();    // Printing the List  System.out.println("After Operation : " + l);  } }

Output
Original : [1, 2] After Operation : []


Syntax of Method

public void clear()

Parameter: This method accepts does not accepts any parameter.

Return Value: The return type of the function is void and it does not returns anything. 

Exceptions: This method throws an UnsupportedOperationException if the clear() operation is not supported by this list. 

Example of List.clear() method 

Program 1: 

Java 
// Java code to illustrate clear() method import java.io.*; import java.util.*; public class ListDemo {  public static void main(String[] args)  {  // Create an empty list with an initial capacity  List<String> l = new ArrayList<String>(5);  // Use add() method to initially  // add elements in the list  l.add("Geeks");  l.add("For");  l.add("Geeks");  // Original List  System.out.println("Original : " + l);    // Removing elements from the List  l.clear();    // Printing the List  System.out.println("After Operation : " + l);  } }

Output
Original : [Geeks, For, Geeks] After Operation : []

Program 2: 

Java 
// Java code to illustrate clear() method import java.io.*; import java.util.*; public class ListDemo  {  public static void main(String[] args)  {  // Create an empty list with an initial capacity  List<Integer> l = new ArrayList<Integer>(5);  // Use add() method to initially  // add elements in the list  l.add(10);  l.add(20);  l.add(30);  // Original List  System.out.println("Original : " + l);    // Removing elements from the List  l.clear();    // Printing the List  System.out.println("After Operation : " + l);  } }

Output
Original : [10, 20, 30] After Operation : []

Reference: https://docs.oracle.com/javase/7/docs/api/java/util/List.html#clear()


G

gopaldave
Improve
Article Tags :

Explore

Lightbox