What are the differences between Java and JavaScript?

Learning Java courses presents numerous advantages in the realm of programming and software development.

Firstly, Java courses are renowned for its platform independence, allowing developers to write code that can run on any device or platform supporting Java, thanks to its “write once, run anywhere” (WORA) philosophy.

20 mcq’s for java

Secondly, Java’s robustness and reliability make it a preferred choice for building large-scale, mission-critical applications, as it emphasizes strong error-checking and handling mechanisms.

Thirdly, Java’s vast community support, extensive libraries, and frameworks simplify development, enabling programmers to leverage pre-existing solutions for various functionalities.

Moreover, Java’s versatility spans across diverse domains, including web development, mobile app development (Android), enterprise systems, and more, offering ample career opportunities and flexibility for developers.

Its object-oriented nature, scalability, and performance contribute to its significance as a language, making Java a cornerstone skill in the programming landscape.

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Here are twenty multiple-choice questions (MCQs) related to Java, along with their respective answers:

Which of the following is not a Java primitive data type?
a) int
b) string
c) double
d) boolean
Answer: b) string

What is the superclass for all classes in Java?
a) Super
b) Main
c) Object
d) Base
Answer: c) Object

Which keyword is used for inheritance in Java?
a) super
b) inherit
c) extends
d) implements
Answer: c) extends

What is the correct way to declare a constant variable in Java?
a) constant int x = 5;
b) const int x = 5;
c) static final int x = 5;
d) final int x = 5;
Answer: d) final int x = 5;

Which method is called automatically when an object is created in Java?
a) start()
b) init()
c) main()
d) constructor()
Answer: d) constructor()

What is the output of the code snippet: System.out.println(10 == 5 + 5); ?
a) 10
b) true
c) false
d) 5
Answer: c) false

Which Java keyword is used to explicitly throw an exception?
a) throws
b) raise
c) throw
d) exception
Answer: c) throw

What is the purpose of the static keyword in Java?
a) To create dynamic variables
b) To define a class member that belongs to the class, not instances
c) To access instance variables
d) To prevent inheritance
Answer: b) To define a class member that belongs to the class, not instances

What is the correct syntax to create an object in Java?
a) Object obj = new Object();
b) Object obj = Object.create();
c) Object obj = create Object;
d) Object obj = Object.create;
Answer: a) Object obj = new Object();

Which method is used to compare two strings for equality in Java?
a) equals()
b) isEqual()
c) compare()
d) equalTo()
Answer: a) equals()

Which collection class in Java uses a hash table for storage?
a) ArrayList
b) TreeMap
c) HashSet
d) LinkedList
Answer: c) HashSet

What is the return type of the main method in Java?
a) void
b) int
c) String
d) static
Answer: a) void

What is the correct way to comment multiple lines in Java?
a) /– comment –/
b) /* comment */
c) // comment //
Answer: b) / comment /

Which loop is used for iterating over a collection of items in Java?
a) for loop
b) while loop
c) do-while loop
d) foreach loop
Answer: d) foreach loop

What is the output of the code snippet: System.out.println(10 / 3); ?
a) 3
b) 3.33
c) 3.0
d) 4
Answer: c) 3.0

Which keyword is used to define a method that cannot be overridden in Java?
a) protected
b) final
c) private
d) abstract
Answer: b) final

Which of the following is an example of a Java wrapper class?
a) Integer
b) Double
c) Character
d) All of the above
Answer: d) All of the above

What is the correct way to exit a loop in Java?
a) break
b) exit
c) stop
d) end
Answer: a) break

What does the super keyword refer to in Java?
a) Refers to the current object
b) Refers to the superclass object
c) Refers to the subclass object
d) Refers to the base class object
Answer: b) Refers to the superclass object

Which method is used to convert a string to uppercase in Java?
a) toUpperCase()
b) upperCase()
c) convertUpperCase()
d) caseUpper()
Answer: a) toUpperCase()