List removeAll() method in Java with Examples

This method is used to remove all the elements present in the collection from the specified list.

Syntax:

boolean removeAll(Collection c)

Parameters: This method has only argument, collection of which elements are to be removed from the given list.



Returns: This method returns True if elements are removed and list changes.

Below programs show the implementation of this method.

Program 1:

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// Java code to show the implementation of
// removeAll method in list interface
import java.util.*;
public class GfG {
  
    // Driver code
    public static void main(String[] args)
    {
  
        // Initializing a list of type Linkedlist
        List<Integer> l = new LinkedList<>();
        l.add(10);
        l.add(30);
        l.add(50);
        l.add(70);
        l.add(90);
        System.out.println(l);
  
        ArrayList<Integer> arr = new ArrayList<>();
        arr.add(30);
        arr.add(50);
        l.removeAll(arr);
  
        System.out.println(l);
    }
}

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Output:

[10, 30, 50, 70, 90]
[10, 70, 90]

Program 2: Below is the code to show implementation of list.removeAll() using Linkedlist.

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// Java code to show the implementation of
// removeAll method in list interface
import java.util.*;
public class GfG {
  
    // Driver code
    public static void main(String[] args)
    {
  
        // Initializing a list of type Linkedlist
        List<String> l = new LinkedList<>();
        l.add("10");
        l.add("30");
        l.add("50");
        l.add("70");
        l.add("90");
        System.out.println(l);
  
        ArrayList<String> arr = new ArrayList<>();
        arr.add("30");
        arr.add("50");
        l.removeAll(arr);
  
        System.out.println(l);
    }
}

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Output:

[10, 30, 50, 70, 90]
[10, 70, 90]

Reference:
Oracle Docs



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