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