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Showing content from https://www.geeksforgeeks.org/java/list-clear-method-in-java-with-examples/ below:

List clear() method in Java with Examples

Last Updated : 29 Nov, 2024

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()

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