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This deck focuses on Arraylist Methods, giving you a quick way to review the definitions, rules, and examples that matter most for AP Computer Science a.
AP Computer Science a Flashcards: Arraylist Methods
Study Arraylist Methods in AP Computer Science a with focused flashcards that help you recognize the idea, recall the key rule, and apply it in practice-style prompts.
AP Computer Science a
Arraylist Methods
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QUESTION
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Identify the method that removes an element at a specified index in an ArrayList.
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ANSWER
remove(int index). Removes by index and returns the removed element.
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Flashcard 1: Identify the method that removes an element at a specified index in an ArrayList.
Answer: remove(int index). Removes by index and returns the removed element.
Flashcard 2: What exception does the set method throw if the index is out of range?
Answer: IndexOutOfBoundsException. Thrown when index < 0 or >= size().
Flashcard 3: Identify the method that removes the first occurrence of a specified element in an ArrayList.
Answer: remove(Object o). Searches and removes by value, not index.
Flashcard 4: What does the ArrayList get method return?
Answer: Returns the element at the specified index. Accesses elements without modifying the ArrayList.
Flashcard 5: Identify the method to check if an ArrayList contains a specific element.
Answer: contains(Object o). Returns true if element exists in the list.
Flashcard 6: What exception does the set method throw if the index is out of range?
Answer: IndexOutOfBoundsException. Thrown when index < 0 or >= size().
Flashcard 7: What is the return type of the ArrayList remove method?
Answer: Returns the element that was removed. Returns the element that was at the index.
Flashcard 8: Identify the method that inserts all elements of a collection into an ArrayList at a specified position.
Answer: addAll(int index, Collection<? extends E> c). Shifts existing elements to accommodate new ones.
Flashcard 9: What does the ArrayList hashCode method return?
Answer: Returns hash code value for the list. Computed from elements for hashing collections.
Flashcard 10: Which method returns the index of the last occurrence of an element in an ArrayList?
Answer: lastIndexOf(Object o). Searches backwards from the end of the list.
Flashcard 11: Find the method to clear all elements from an ArrayList.
Answer: clear(). Removes all elements, making the list empty.
Flashcard 12: What is the boolean return type of the remove method used with an object in ArrayList?
Answer: True if the element is successfully removed. Returns false if element was not found.
Flashcard 13: Identify the method to check if an ArrayList contains a specific element.
Answer: contains(Object o). Returns true if element exists in the list.
Flashcard 14: Identify the method that inserts all elements of a collection into an ArrayList at a specified position.
Answer: addAll(int index, Collection<? extends E> c). Shifts existing elements to accommodate new ones.
Flashcard 15: Which method in ArrayList appends all elements in a specified collection?
Answer: addAll(Collection<? extends E> c). Adds all elements to the end sequentially.
Flashcard 16: Which method retains only the elements in an ArrayList that are in a specified collection?
Answer: retainAll(Collection<?> c). Keeps only common elements between collections.
Flashcard 17: What is the consequence of modifying an ArrayList while iterating over it?
Answer: Throws ConcurrentModificationException. Prevents corruption from simultaneous modifications.
Flashcard 18: Identify the method that removes an element at a specified index in an ArrayList.
Answer: remove(int index). Removes by index and returns the removed element.
Flashcard 19: Find the method to clear all elements from an ArrayList.
Answer: clear(). Removes all elements, making the list empty.
Flashcard 20: What is the consequence of modifying an ArrayList while iterating over it?
Answer: Throws ConcurrentModificationException. Prevents corruption from simultaneous modifications.
Flashcard 21: What does the ArrayList isEmpty method check?
Answer: Checks if the ArrayList is empty. Returns true if size equals zero.
Flashcard 22: Which method in ArrayList returns an iterator over the elements?
Answer: iterator(). Enables traversal through enhanced for loops.
Flashcard 23: Which method in ArrayList returns an iterator over the elements?
Answer: iterator(). Enables traversal through enhanced for loops.
Flashcard 24: Which method returns the index of the last occurrence of an element in an ArrayList?
Answer: lastIndexOf(Object o). Searches backwards from the end of the list.
Flashcard 25: What does the toString method return for an ArrayList?
Answer: String representation of the list. Shows elements in bracket-separated format.
Flashcard 26: In which scenario does the ArrayList get method throw an exception?
Answer: Throws IndexOutOfBoundsException if index is out of range. When index is negative or >= size().
Flashcard 27: Which method replaces an element at a specified position in an ArrayList?
Answer: set(int index, E element). Replaces existing element and returns old value.
Flashcard 28: What is the purpose of the toArray method in ArrayList?
Answer: Converts the ArrayList to an array. Creates Object array containing list elements.
Flashcard 29: What does the ArrayList indexOf method return?
Answer: Returns index of first occurrence of an element. Returns -1 if element is not found.
Flashcard 30: What does the toString method return for an ArrayList?
Answer: String representation of the list. Shows elements in bracket-separated format.
Flashcard 31: What does the subList method in ArrayList return?
Answer: Returns a view of a portion of the list. Creates sublist that reflects changes to original.
Flashcard 32: What is the purpose of the toArray method in ArrayList?
Answer: Converts the ArrayList to an array. Creates Object array containing list elements.
Flashcard 33: What is the purpose of the ArrayList add method?
Answer: Adds an element to the ArrayList. Inserts elements at the end or specified position.
Flashcard 34: Find the method that checks if two ArrayLists are equal.
Answer: equals(Object o). Compares element-by-element for structural equality.
Flashcard 35: Which method returns a shallow copy of an ArrayList?
Answer: clone(). Creates independent copy with same elements.
Flashcard 36: Which method returns a shallow copy of an ArrayList?
Answer: clone(). Creates independent copy with same elements.
Flashcard 37: What is the boolean return type of the remove method used with an object in ArrayList?
Answer: True if the element is successfully removed. Returns false if element was not found.
Flashcard 38: What does the subList method in ArrayList return?
Answer: Returns a view of a portion of the list. Creates sublist that reflects changes to original.
Flashcard 39: What does the ArrayList isEmpty method check?
Answer: Checks if the ArrayList is empty. Returns true if size equals zero.
Flashcard 40: What does the ArrayList hashCode method return?
Answer: Returns hash code value for the list. Computed from elements for hashing collections.
Flashcard 41: What does the ArrayList get method return?
Answer: Returns the element at the specified index. Accesses elements without modifying the ArrayList.
Flashcard 42: Which method returns the number of elements in an ArrayList?
Answer: size(). Returns the current number of stored elements.
Flashcard 43: Find the method to add an element at a specific position in an ArrayList.
Answer: add(int index, E element). Inserts element and shifts existing elements right.
Flashcard 44: Identify the method to remove all elements from an ArrayList that are in a specified collection.
Answer: removeAll(Collection<?> c). Removes elements that exist in both collections.
Flashcard 45: Which method sorts the elements of an ArrayList based on a specified comparator?
Answer: sort(Comparator<? super E> c). Orders elements according to comparison logic.
Flashcard 46: Which method returns the number of elements in an ArrayList?
Answer: size(). Returns the current number of stored elements.
Flashcard 47: Which method sorts the elements of an ArrayList based on a specified comparator?
Answer: sort(Comparator<? super E> c). Orders elements according to comparison logic.
Flashcard 48: What is the return type of the ArrayList remove method?
Answer: Returns the element that was removed. Returns the element that was at the index.
Flashcard 49: Find the method that checks for equality between an ArrayList and another object.
Answer: equals(Object o). Compares element-by-element for structural equality.
Flashcard 50: Which method retains only the elements in an ArrayList that are in a specified collection?
Answer: retainAll(Collection<?> c). Keeps only common elements between collections.
Flashcard 51: What does the ArrayList indexOf method return?
Answer: Returns index of first occurrence of an element. Returns -1 if element is not found.
Flashcard 52: Identify the method that removes the first occurrence of a specified element in an ArrayList.
Answer: remove(Object o). Searches and removes by value, not index.
Flashcard 53: Find the method that checks for equality between an ArrayList and another object.
Answer: equals(Object o). Compares element-by-element for structural equality.
Flashcard 54: In which scenario does the ArrayList get method throw an exception?
Answer: Throws IndexOutOfBoundsException if index is out of range. When index is negative or >= size().
Flashcard 55: Which method replaces an element at a specified position in an ArrayList?
Answer: set(int index, E element). Replaces existing element and returns old value.
Flashcard 56: Identify the method to remove all elements from an ArrayList that are in a specified collection.
Answer: removeAll(Collection<?> c). Removes elements that exist in both collections.
Flashcard 57: Which method in ArrayList appends all elements in a specified collection?
Answer: addAll(Collection<? extends E> c). Adds all elements to the end sequentially.
Flashcard 58: What is the purpose of the ArrayList add method?
Answer: Adds an element to the ArrayList. Inserts elements at the end or specified position.
Flashcard 59: Find the method to add an element at a specific position in an ArrayList.
Answer: add(int index, E element). Inserts element and shifts existing elements right.
Flashcard 60: Find the method that checks if two ArrayLists are equal.
Answer: equals(Object o). Compares element-by-element for structural equality.