JAVA CONCEPTS

Important Java Mcq 1

How many times will the following code print “Welcome to Java”?

int count = 0;
while (count < 10) {
    System.out.println("Welcome to Java");
    count++;

}

a. 13

b. 12

c. 11

d. 10

Answer:

d. 10

Explanation:

The value of count is getting incremented by 1 every time starting from 0 till it reaches 10 which would lead to 10 print statements.

Which keyword is used to import a package from the Java API library?

a) lib b) package c) getlib d) import Answer d) import

Which of the following is not a valid interface?

a. ResultSet b. DriverManager c. Statement d. Connection Answer: b. DriverManager Explanation: DriverManager is a class that acts as an interface between users and Drivers. It

All subclasses are a subtype in object-oriented programming.

a) True b) False Answer b) False Explanation: A subtype is something that is substituted for and behaves as its parent type. All subclass may

Which statement is true for object code?

i) It is used as its fundamental building block ii) Similar objects are classified using a concept of class iii) Polymorphism and abstraction are not