Java ArrayList removeAll() method with Examples

by Online Tutorials Library July 22, 2022

Java ArrayList removeAll() Method

The removeAll() method of Java ArrayList class removes all the elements from a list that are contained in the specified collection.

Syntax:

Parameter:

“c”: collection that contained elements to be removed from this list.

Return:

True if the original list changed as a result of this call.

Exception:

java.lang.NullPointerException: If the specified collection is null, or if the original list contains null elements and the specified collection does not permit null elements.

ClassCastException: if the class of an element of the original list is incompatible with the specified collection.

Example 1

  import java.util.ArrayList;  public class ArrayListRemoveAllExample1  {  ArrayList<String> letters = new ArrayList<>();  letters.add(“A”);  letters.add(“B”);  letters.add(“C”);  letters.add(“D”);  letters.add(“E”);  System.out.println(letters);// [A, B, C, D, E]  ArrayList<String>removedLetters = new ArrayList<>();  removedLetters.add(“C”);  removedLetters.add(“D”);  removedLetters.add(“E”);  System.out.println(removedLetters);// [C, D, E]  System.out.println(letters.removeAll(removedLetters)); //true  System.out.println(letters);// [A, B]  }  

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Output:

[A, B, C, D, E]  [C, D, E]  true  [A, B]

Example 2

  import java.util.ArrayList;  public class ArrayListRemoveAllExample2  {  ArrayList<String> letters = new ArrayList<>();  letters.add(“A”);  letters.add(“B”);  letters.add(“C”);  letters.add(“D”);  System.out.println(letters);// [A, B, C, D]  ArrayList<Integer> numbers = new ArrayList<>();  numbers.add(1);  numbers.add(2);  letters.removeAll(numbers);// throw  ClassCastException  }  

Test it Now

Output:

[A, B, C, D]

Example 3

  import java.util.ArrayList;  public class ArrayListRemoveAllExample3  {  ArrayList<String> letters = null;      System.out.println(letters);// null  ArrayList<String>removedLetters = new ArrayList<>();  removedLetters.add(“a”);  removedLetters.add(“b”);  System.out.println(removedLetters);// [a, b]  letters.removeAll(removedLetters);// throw NullPointerException  }  

Test it Now

Output:

null  [a, b]

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Java ArrayList removeAll() method with Examples

Java ArrayList removeAll() Method

Syntax:

Parameter:

Return:

Exception:

Example 1

Example 2

Example 3

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