AbstractList clear() method in Java with Examples

Last Updated : 22 Aug, 2019

The clear() method of java.util.AbstractList class is used to remove all of the elements from this list. The list will be empty after this call returns.

Syntax:

public void clear()

Returns Value: This method does not return anything.

Below are the examples to illustrate the clear() method.

Example 1:

// Java program to demonstrate 
// clear() method 
// for String value 
  
import java.util.*; 
  
public class GFG1 { 
    public static void main(String[] argv) 
        throws Exception 
    { 
  
        try { 
  
            // Creating object of AbstractList<String> 
            AbstractList<String> 
                arrlist1 = new ArrayList<String>(); 
  
            // Populating arrlist1 
            arrlist1.add("A"); 
            arrlist1.add("B"); 
            arrlist1.add("C"); 
            arrlist1.add("D"); 
            arrlist1.add("E"); 
  
            // print the ArrayList 
            System.out.println("Original ArrayListlist : "
                               + arrlist1); 
  
            // Removing all the elements 
            // using clear() method 
            arrlist1.clear(); 
  
            // print the new ArrayList 
            System.out.println("New ArrayList : "
                               + arrlist1); 
        } 
  
        catch (NullPointerException e) { 
            System.out.println("Exception thrown : "
                               + e); 
        } 
    } 
} 

Output:

Original ArrayListlist : [A, B, C, D, E]
New ArrayList : []

Example 2:

// Java program to demonstrate 
// clear() method 
// for Integer value 
  
import java.util.*; 
  
public class GFG1 { 
    public static void main(String[] argv) 
        throws Exception 
    { 
  
        try { 
  
            // Creating object of AbstractList<Integer> 
            AbstractList<Integer> 
                arrlist1 = new ArrayList<Integer>(); 
  
            // Populating arrlist1 
            arrlist1.add(10); 
            arrlist1.add(20); 
            arrlist1.add(30); 
            arrlist1.add(40); 
            arrlist1.add(50); 
  
            // print the ArrayList 
            System.out.println("Original ArrayListlist : "
                               + arrlist1); 
  
            // Removing all the elements 
            // using clear() method 
            arrlist1.clear(); 
  
            // print the new ArrayList 
            System.out.println("New ArrayList : "
                               + arrlist1); 
        } 
  
        catch (NullPointerException e) { 
            System.out.println("Exception thrown : " + e); 
        } 
    } 
} 

Output:

Original ArrayListlist : [10, 20, 30, 40, 50]
New ArrayList : []

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