Java Control Statements MCQ

Control statements in Java are a fundamental concept. They drive the flow of execution, ensuring that our programs respond dynamically to various conditions. As any Java developer knows, mastering control statements is paramount to building efficient and functional code. In this blog post, we'll dive deep into some intriguing multiple-choice questions (MCQs) related to Java's control statements.

1. Which of the following is used to make a decision in Java?

a) if-else
b) switch
c) both a and b
d) none of the above

Answer:

Answer:c) both a and b

Explanation:

Explanation:Both if-else and switch are control statements used to make decisions based on conditions.

2. How many else if parts can an if statement have?

a) None
b) Only one
c) At most two
d) As many as needed

Answer:

d) As many as needed

Explanation:

An if statement can have multiple else-if parts. The conditions are checked in sequence until one is found to be true or all have been checked.

3. Which control statement is best used when you need to check multiple conditions sequentially?

a) if
b) for
c) switch
d) while

Answer:

c) switch

Explanation:

The switch statement is designed for scenarios where a single variable or expression is checked against multiple potential values.

4. What is the role of the break statement inside a switch?

a) To start the next case
b) To exit the switch statement
c) To skip to the default case
d) None of the above

Answer:

b) To exit the switch statement

Explanation:

The break statement is used to exit the current switch statement, ensuring that once a matching case is found, subsequent cases are not executed.

5. How many times does a do-while loop guarantee to run its block of code?

a) Never
b) Once
c) Twice
d) Until the condition becomes false

Answer:

b) Once

Explanation:

A do-while loop checks its condition at the end of the loop. This means it will always execute its block of code at least once, regardless of whether the condition is initially true or false.

6. What will happen if you don’t use a break statement inside a switch case?

a) The program will not compile.
b) It will only execute the matched case.
c) It will execute all the cases after the first match, including the default, if no other break is encountered.
d) The program will terminate.

Answer:

c) It will execute all the cases after the first match, including the default, if no other break is encountered.

Explanation:

Without a break, the switch statement will exhibit "fall-through" behavior, executing subsequent case statements until a break is encountered or it reaches the end of the switch block.

7. What does the continue statement do inside a loop?

a) Stops the loop
b) Skips the current iteration
c) Restarts the loop
d) Continues indefinitely

Answer:

b) Skips the current iteration

Explanation:

The continue statement causes the loop to skip the rest of the current iteration and jump to the next one.

8. Which control statement can be used to selectively execute a block of code?

a) switch
b) if-else
c) for
d) break

Answer:

b) if-else

Explanation:

The if-else control statement is used to selectively execute blocks of code based on a condition.

9. For how many values can a switch statement check a variable?

a) One
b) Two
c) Three
d) Any number

Answer:

d) Any number

Explanation:

A switch statement can check a variable against any number of values using different case labels.

10. What is the primary difference between if and switch statements?

a) if is a loop, a switch is conditional
b) if checks for boolean values, switch checks against constant values
c) if can only have two conditions, a switch can have multiple
d) if and switch are the same

Answer:

b) if checks for boolean values, switch checks against constant values

Explanation:

An if statement evaluates boolean expressions (true or false). In contrast, a switch statement checks a variable or expression against multiple constant values.



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