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