GEMS Quiz

What is the difference between String and StringBuilder in Java?

• a) String is mutable, and StringBuilder is immutable
• b) String is thread-safe, and StringBuilder is not
• c) String is faster than StringBuilder
• d) String has more methods than StringBuilder

How do you handle exceptions in Java?

• a) Using throws keyword
• b) Using try-catch blocks
• c) Ignoring exceptions
• d) Using finally block

What is the purpose of JUnit's @Test annotation?

• a) It specifies the order of execution
• b) It marks a method as a test case
• c) It defines a timeout for the test
• d) It skips the test case

How can you create a custom exception in Java?

• a) By extending RuntimeException
• b) By implementing the Exception interface
• c) By using the throw keyword
• d) By calling System.exit()

What is the use of static keyword in Java?

• a) To define a variable with constant value
• b) To create objects of a class
• c) To access class members without creating an instance
• d) To implement singleton pattern

How do you write a for loop in Java?

• a) for (int i = 0; i < n; i++)
• b) for (int i = n; i >= 0; i--)
• c) for (int i = 1; i <= n; i++)
• d) for (int i = n; i > 0; i--)

What is the purpose of the equals() method in Java?

• a) To compare two objects for identity
• b) To compare two objects for equality
• c) To check if an object is null
• d) To clone an object

How do you convert a String to an int in Java?

• a) Using Integer.parseInt()
• b) Using String.valueOf()
• c) Using int.valueOf()
• d) Using Integer.valueOf()

What is the output of the following Java code? public class Main { public static void main(String[] args) { int x = 10; int y = x++ + ++x; System.out.println(y); } }

• a) 10
• b) 20
• c) 30
• d) 40

What is Spring Framework primarily used for?

• a) Front-end
• b) Back-end
• c) Mobile
• d) Game