a) To refer to the superclass of the current object.

b) To invoke the superclass constructor.

c) To access the superclass's static methods.

d) All of the above.

a) float x;

b) double x;

c) float x = 5.0;

d) double x = 5.0;

a) It is used to compare the memory addresses of two objects.

b) It is a method of the Object class.

c) It is used to compare the values of two objects.

d) It is only applicable to primitive data types.

a) array = [1, 2, 3];

b) int array[] = new int[]{1, 2, 3};

c) int array[3] = {1, 2, 3};

d) int[] array = {1, 2, 3};

a) To handle exceptions.

b) To execute code regardless of whether an exception is thrown or not.

c) To specify code that will throw an exception.

d) To indicate that the code is unreachable.

a) ArrayList is a synchronized collection.

b) Elements in an ArrayList must be of the same data type.

c) ArrayList automatically resizes itself when elements are added or removed.

d) ArrayList does not allow duplicate elements.

a) true

b) false

c) null

d) 0

a) interface

b) class

c) implements

d) extend

a) It indicates that a variable is constant.

b) It is used to define a class within another class.

c) It is used to declare a method that can be called without creating an instance of the class.

d) It is used to make a class immutable.

a) parseInt()

b) parseInteger()

c) toInteger()

d) valueOf()

a) It refers to the current instance of the class.

b) It is used to create a new instance of a class.

c) It is used to call a method of the superclass.

d) It refers to the parent class of the current class.

a) Interfaces

b) Abstract classes

c) Enums

d) Packages

a) Using the constant keyword

b) Using the final keyword

c) Using the const keyword

d) Constants cannot be declared in Java

a) equalsIgnoreCase()

b) equals()

c) compareToIgnoreCase()

d) compareTo()

a) To allocate memory for a new object

b) To declare a new variable

c) To create a new class

d) To invoke a static method

a) ArrayList

b) LinkedList

c) HashMap

d) Vector

a) It refers to the subclass.

b) It refers to the current instance of the class.

c) It refers to the superclass.

d) It refers to the static context.

a) length()

b) size()

c) count()

d) strlen()

a) FTP

b) HTTP

c) HTTPS

d) SMTP