Java Coding Questions

Quiz
•
Computers
•
University
•
Hard
karthi jegadeesan
Used 6+ times
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20 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Given the following class, what’s the output when creating a book with no parameters?
java
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class Book { String title; Book() { this("Untitled"); System.out.println("Default constructor called"); } Book(String title) { this.title = title; System.out.println("Title constructor called: " + title); } }
java
CopyEdit
Book b = new Book();
Only “Default constructor called”
Only “Title constructor called: Untitled”
Both lines, in order
Compilation error
2.
MULTIPLE CHOICE QUESTION
10 sec • 1 pt
You want to store a list of books borrowed by a user. Which of the following is the most appropriate collection?
A. HashSet<Book>
B. ArrayList<Book>
C. TreeMap<Book>
D. Vector<Book>
3.
MULTIPLE CHOICE QUESTION
10 sec • 1 pt
When a user tries to borrow a book that’s not available, a BookNotAvailableException should be thrown. Which is the correct way to define and throw a custom exception?
A. throw new Exception("Not available");
B. class BookNotAvailableException extends RuntimeException
C. throw new BookNotAvailableException(); after defining the class extending Exception
D. All of the above are correct
4.
MULTIPLE CHOICE QUESTION
10 sec • 1 pt
What will happen when the following code is executed?
int[] arr = {10, 20, 30}; for (int i = 0; i <= arr.length; i++) { System.out.println(arr[i]); }
A. Prints all elements successfully
B. Compiles but throws ArrayIndexOutOfBoundsException at runtime
C. Compile-time error
D. Prints garbage values
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following lines will throw a NullPointerException?
String s = null;
A. if (s == null)
B. if ("test".equals(s))
C. if (s.equals("test"))
D. System.out.println(s)
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the output of the following code?
boolean flag = false; if (flag = true) { System.out.println("Flag is true"); } else { System.out.println("Flag is false"); }
A. Flag is true
B. Flag is false
C. Compile-time error
D. Runtime exception
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the result of the code below?
public class Test { public static void main(String[] args) { return; System.out.println("This won't print"); } }
A. Code runs normally
B. Compilation error: unreachable code
C. Prints the statement
D. Runtime exception
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