IT-OOPRGO21 PRELIM

What are the basic operations that can be performed on a two-dimensional array?

• Converting to strings

• Creating three-dimensional arrays

• Sorting elements

• Accessing elements, modifying elements, traversing, adding/removing rows and columns, and performing mathematical operations.

How do you declare and initialize a two-dimensional array in Java?

• int[3,4] array = new int[][];

• int array = new int[3][4];

• int array[][] = new int[4][3];

• int[][] array = new int[3][4]; // Declaration and initialization

What is the Array class in Java and what are its main features?

• The Array class in Java provides utility methods for array manipulation, including sorting, searching, and filling, but cannot be instantiated.

• The Array class can be instantiated like other classes in Java.

• The Array class only provides methods for array creation.

• The Array class is used for managing collections of objects in Java.

List some common methods provided by the Array class in Java.

• split

• copyOf, copyOfRange, fill, sort, equals

• reverse

• merge

What is an ArrayList and how does it differ from a regular array?

• An ArrayList can only store primitive data types.

• A regular array can change its size dynamically.

• An ArrayList is a dynamic array that can resize itself, while a regular array has a fixed size.

• An ArrayList is a type of linked list.

Describe the process of adding an element to an ArrayList in Java.

• arrayList.addItem(element);

• arrayList.insert(element);

• Use arrayList.add(element);

• arrayList.push(element);

What are some key methods of the ArrayList class?

• add(), remove(), get(), size(), clear()

• update()

• insert()

• find()

How do you remove an element from an ArrayList?

• Use arrayList.delete(index) to remove an element from an ArrayList.

• Use arrayList.remove(index) or arrayList.remove(element) to remove an element from an ArrayList.

• Use arrayList.removeAt(index) to delete an element from an ArrayList.

• Call arrayList.clear() to remove a specific element from an ArrayList.

What are the advantages of using dynamic arrays over static arrays?

• Dynamic arrays offer flexibility in size, allowing for dynamic memory allocation and efficient use of resources.

• Static arrays are easier to implement than dynamic arrays.

• Dynamic arrays require more memory than static arrays.

• Static arrays can grow in size during runtime.

Explain the concept of sorting techniques in programming.

• Sorting techniques are algorithms for compressing data files.

• Sorting techniques are used to delete elements from a list.

• Sorting techniques are methods for searching elements in a database.

• Sorting techniques are algorithms for arranging elements in a specific order.