COLLECTIONS FRAMEWORK
Between ArrayList and LinkedList, which collection would you choose for fast random access to elements?

• ArrayList

• LinkedList

COLLECTIONS FRAMEWORK
What is the primary characteristic of a HashMap in Java?

• It sorts the keys in natural order.

• It allows duplicate keys.

• It maintains the order of its keys in the order they were inserted.

• It provides constant-time performance for basic operations (get and put).

OBJECTS
Which of the following statements is true about the relationship between equals() and hashCode()?

• hashCode() and equals() are independent and do not affect each other.

• Two objects with the same hash code must be equal.

• Two objects that are equal must have the same hash code.

• If two objects are unequal according to the equals() method, they must have the same hashCode().

EXCEPTIONS

Which of the following is a checked exception?

• NullPointerException

• IOException

• ArithmeticException

• ArrayIndexOutOf
  BoundsException

I/O STREAMS
Which class should be used to improve the performance of character input stream?

• BufferedReader

• FileReader

• FileInputStream

• InputStreamReader

NETWORKING
What identifies a running process in a machine and helps direct network traffic to it?

• Port Number

• IP Address

• MAC address

• Ethernet Frame

NETWORKING
What is the primary advantage of using UDP over TCP?

• Reliable delivery

• Faster data transmission

• Data encryption

• Data recovery features

NETWORKING

Which of the following protocols guarantees delivery of data packets?

• TCP

• UDP

NETWORKING
In a client-server model, the server:

• Initiates communication with clients and controls the client’s actions

• Only responds to requests when the client is offline

• The server shares its resources with other servers instead of clients

• Processes requests from the client

WEB

HTTP is considered a stateless protocol because:

• It can work with both TCP and UDP.

• It operates on port 80 by default.

• Client requests to the server are treated independently of each other.

• It stores session information on the server between requests.