Collections v1

What are some of the data structures mentioned in Chapter 7 - Collections?

• Arrays, Lists, and Sets

• Graphs, Trees, and Hashmaps

• Stacks, Queues, and Heaps

• Linked Lists, Dictionaries, and Tuples

The Java API helps in working with data structures according to Chapter 7 - Collections by:

• providing a set of interfaces and classes for storing and manipulating groups of data as a single unit

• offering a graphical user interface for data manipulation

• allowing direct access to memory for faster data processing

• enabling the use of SQL queries directly on Java objects

In Chapter 7 - Collections, you will learn about:

• Data Structures

• Algorithms

• Networking

• Operating Systems

A list is a sequential collection in which each element has a(n) ________.

• integer index.

• unique identifier.

• random value.

• fixed size.

Which implementations does Java provide for a set?

• A) HashMap and TreeMap

• B) HashSet and TreeSet

• C) LinkedHashMap and TreeMap

The purpose of the add(Object) method in Java collections is to:

• Add an element to the collection

• Remove an element from the collection

• Check if the collection is empty

• Sort the elements in the collection

The 'contains' method in the provided Java code example is used to:

• Check if a string contains a specified sequence of char values.

• Add a new element to a collection.

• Remove an element from a collection.

• Compare two strings for equality.

The purpose of the equals(Object o) method in Java is to:

• compare two objects for equality

• compare two objects for memory address

• convert an object to a string

• initialize an object

The isEmpty() method in Java:

• Checks if a string is empty or not

• Removes all elements from a collection

• Returns the size of a collection

• Checks if a file is empty

True or False: The isEmpty() method returns true if the collection contains elements.

• True

• False