FA1_Arrays and ArrayLists in Java

What is the primary purpose of an array in Java?

• To manage memory allocation efficiently.

• To perform mathematical calculations.

• To store multiple values of the same type.

• To store values of different types.

How do you declare an array in Java?

• You declare an array in Java using the syntax: 'type[] arrayName;' or 'type arrayName[];'. For example, 'int[] numbers;'. You can also initialize it with 'new type[size]' or with values like 'new type[]{value1, value2, ...}'.

• Arrays in Java are declared using 'arrayName: type[];'

• You declare an array in Java with 'arrayName = new type[size];'

• You can only declare arrays with fixed sizes in Java.

What is the main difference between an array and an ArrayList?

• An ArrayList is always faster than an array in all operations.

• The main difference is that an array has a fixed size, whereas an ArrayList can grow and shrink dynamically.

• An array is a type of ArrayList that is optimized for performance.

• An array can hold different data types, while an ArrayList can only hold one type.

Can an array in Java hold different data types?

• An array can hold objects of different classes.

• Java arrays can be heterogeneous by default.

• Yes, an array can hold different data types.

• No, a standard array cannot hold different data types.

How do you access the first element of an array?

• Use arrayName(1) to access the first element of an array.

• Access the first element with arrayName.first() method.

• The first element can be accessed using arrayName[-1].

• Use arrayName[0] to access the first element of an array.

What method is used to find the length of an array?

• Use the 'size' function of the array.

• Access the first element to determine length.

• Count the number of elements manually.

• Use the 'length' property of the array.

How do you iterate through an array using a for loop?

• for (int i = 0; i < array.length; i += 2) { // process array[i] }

• for (int i = 0; i < array.length; i++) { // process i }

• for (int i = 1; i <= array.length; i++) { // process array[i] }

• Use a for loop like: for (int i = 0; i < array.length; i++) { // process array[i] }

What is the syntax to create an ArrayList in Java?

• ArrayList listName = new ArrayList();

• ArrayList listName = new ArrayList<>();

• ArrayList listName = ArrayList<>();

• ArrayList = new ArrayList();

How do you add an element to an ArrayList?

• Use the push() method, e.g., list.push(element);

• Add elements using the append() method, e.g., list.append(element);

• Use the add() method, e.g., list.add(element);

• Use the insert() method, e.g., list.insert(index, element);

What happens if you try to access an index that is out of bounds in an array?

• The array automatically expands to accommodate the index.

• An error or exception is thrown.

• The program continues without any issues.

• The value at the last index is returned instead.