Java ArrayList - removeAll() Method
The java.util.ArrayList.removeAll() method is used to remove from the given list all of its elements that are contained in the specified collection.
Syntax
public boolean removeAll(Collection<?> c)
Parameters
c |
Specify the collection of elements to be removed from the list. |
Return Value
Returns true if the list changed as a result of the call.
Exception
Throws NullPointerException, if the specified collection is null.
Example:
In the example below, the java.util.ArrayList.removeAll() method is used to remove from the given list all of its elements that are contained in the specified collection.
import java.util.*;
public class MyClass {
public static void main(String[] args) {
//creating ArrayList
ArrayList<Integer> ArrList1 = new ArrayList<Integer>();
ArrayList<Integer> ArrList2 = new ArrayList<Integer>();
//populating ArrList1
ArrList1.add(10);
ArrList1.add(20);
ArrList1.add(30);
ArrList1.add(40);
ArrList1.add(50);
//populating ArrList2
ArrList2.add(20);
ArrList2.add(40);
ArrList2.add(60);
//printing ArrList1
System.out.println("Before removeAll, ArrList1 contains: " + ArrList1);
//apply removeAll method on ArrList1
ArrList1.removeAll(ArrList2);
//printing ArrList1
System.out.println("After removeAll, ArrList1 contains: " + ArrList1);
}
}
The output of the above code will be:
Before removeAll, ArrList1 contains: [10, 20, 30, 40, 50] After removeAll, ArrList1 contains: [10, 30, 50]
❮ Java.util - ArrayList
