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AbstractSequentialList removeAll() method in Java with Example

Last Updated : 30 Sep, 2019
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The removeAll() method of java.util.AbstractSequentialList class is used to remove from this list all of its elements that are contained in the specified collection. Syntax: 
public boolean removeAll(Collection c)
Parameters: This method takes collection c as a parameter containing elements to be removed from this list. Returns Value: This method returns true if this list changed as a result of the call. Exception: This method throws NullPointerException if this list contains a null element and the specified collection does not permit null elements (optional), or if the specified collection is null. Below are the examples to illustrate the removeAll() method. Example 1: Java 
// Java program to demonstrate
// removeAll() method for Integer value

import java.util.*;

public class GFG1 {
    public static void main(String[] argv) throws Exception
    {

        try {

            // Creating object of AbstractSequentialList<Integer>
            AbstractSequentialList<Integer>
                arrlist1 = new LinkedList<Integer>();

            // Populating arrlist1
            arrlist1.add(1);
            arrlist1.add(2);
            arrlist1.add(3);
            arrlist1.add(4);
            arrlist1.add(5);

            // print arrlist1
            System.out.println("AbstractSequentialList before "
                               + "removeAll() operation : "
                               + arrlist1);

            // Creating another object 
// of  AbstractSequentialList<Integer>
            AbstractSequentialList<Integer>
                arrlist2 = new LinkedList<Integer>();
            arrlist2.add(1);
            arrlist2.add(2);
            arrlist2.add(3);

            // print arrlist2
            System.out.println("Collection Elements"
                               + " to be removed : "
                               + arrlist2);

            // Removing elements from arrlist
            // specified in arrlist2
            // using removeAll() method
            arrlist1.removeAll(arrlist2);

            // print arrlist1
            System.out.println("AbstractSequentialList after "
                               + "removeAll() operation : "
                               + arrlist1);
        }

        catch (Exception e) {
            System.out.println(e);
        }
    }
}
Output: 
AbstractSequentialList before removeAll() operation : [1, 2, 3, 4, 5]
Collection Elements to be removed : [1, 2, 3]
AbstractSequentialList after removeAll() operation : [4, 5]
Example 2: For NullPointerException Java 
// Java program to demonstrate
// removeAll() method for Integer value

import java.util.*;

public class GFG1 {
    public static void main(String[] argv) throws Exception
    {

        try {

            // Creating object of AbstractSequentialList<Integer>
            AbstractSequentialList<Integer>
                arrlist1 = new LinkedList<Integer>();

            // Populating arrlist1
            arrlist1.add(1);
            arrlist1.add(2);
            arrlist1.add(3);
            arrlist1.add(4);
            arrlist1.add(5);

            // print arrlist1
            System.out.println("AbstractSequentialList before "
                               + "removeAll() operation : "
                               + arrlist1);

            // Creating another object of  AbstractSequentialList<Integer>
            AbstractSequentialList<Integer>
                arrlist2 = null;

            // print arrlist2
            System.out.println("Collection Elements"
                               + " to be removed : "
                               + arrlist2);

            System.out.println("\nTrying to pass "
                               + "null as a specified element\n");

            // Removing elements from arrlist
            // specified in arrlist2
            // using removeAll() method
            arrlist1.removeAll(arrlist2);

            // print arrlist1
            System.out.println("AbstractSequentialList after "
                               + "removeAll() operation : "
                               + arrlist1);
        }

        catch (Exception e) {
            System.out.println(e);
        }
    }
}
Output: 
AbstractSequentialList before removeAll() operation : [1, 2, 3, 4, 5]
Collection Elements to be removed : null

Trying to pass null as a specified element

java.lang.NullPointerException

C

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