Java Programming Test! Hardest Trivia Questions Quiz
Below is what is seen by many as the hardest trivia questions java programming test. It is not designed for beginners when it comes to this course but for the professionals who think they understand this programming language and how to use it. How about you give it a shot and get to see if you are a novice or an accrual pro when it comes to all things java.
- 1.
Given: public class Test{ public static void main(String[] args) { Test obj = new Test(); short letter = 97; int letter2 = 98; int long = 99; System.out.print((char) letter + " "); System.out.print((char) letter2); } } What is the result?
- A.
A b
- B.
A followed by an exception
- C.
Compilation fails.
- D.
A ClassCastException is thrown at runtime.
Correct Answer
C. Compilation fails.Explanation
The code fails to compile because "long" is a reserved keyword in Java and cannot be used as a variable name.Rate this question:
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- 2.
Given the code fragment: public static void main(String[] args) { short s1 = 200; int s2 = 400; long s3 = (long) s1 + s2; // line n1 String s4 = (String) (s3 * s2 ); // line n2 System.out.println("Sum is " + s4); } What is the result?
- A.
Sum is 600
- B.
Compilation fails at line n1.
- C.
Compilation fails at line n2.
- D.
A exception is thrown at line n1.
- E.
A exception is thrown at line n2.
Correct Answer
C. Compilation fails at line n2.Explanation
The code will fail to compile at line n2 because it is attempting to cast a long value to a String, which is not allowed.Rate this question:
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- 3.
Given: public class Test{ public static void main(String[] args) { short letter; int letter2 = letter + 2; // line n1 System.out.print((short) letter2); // line n2 } } What is the result?
- A.
Compilation fails at line n1.
- B.
Compilation fails at line n2.
- C.
A exception is thrown at line n1.
- D.
A exception is thrown at line n2.
Correct Answer
A. Compilation fails at line n1.Explanation
The compilation fails at line n1 because the variable "letter" is declared but not initialized before it is used in the expression "letter + 2". Since the value of "letter" is not known at this point, the compiler cannot perform the addition and assign the result to "letter2". To fix this error, the variable "letter" should be assigned a value before line n1.Rate this question:
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- 4.
Given the code fragment: public static void main(String[] args) { int a = 10; float b = 10.25f; double c = 100; a = b; // line 7 b = a; // line 8 c = b; // line 9 c = a; // line 10 } Which change enables the code fragment to compile successfully?
- A.
Replace line 10 with c = (double) a;
- B.
Replace line 8 with b = (float) a;
- C.
Replace line 7 with a = (int) b;
- D.
Replace line 9 with c = (double) b;
Correct Answer
C. Replace line 7 with a = (int) b;Explanation
The code fragment does not compile successfully because there are incompatible data types being assigned to variables. In order to fix this, we need to explicitly cast the incompatible data types to compatible ones. In this case, replacing line 7 with "a = (int) b;" will cast the float variable b to an int, allowing it to be assigned to the int variable a.Rate this question:
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- 5.
Given: public class Test{ public static void main(String[] args) { Test obj = new Test(); short letter = 97; int letter2 = 98; System.out.print((char) letter + " "); System.out.print((char) letter2); } } What is the result?
- A.
A b
- B.
A followed by an exception
- C.
Compilation fails
- D.
A ClassCastException is thrown at runtime.
Correct Answer
A. A bExplanation
The code first creates an instance of the Test class. It then assigns the value 97 to a variable named "letter" of type short, and assigns the value 98 to a variable named "letter2" of type int.
In the first print statement, the value of "letter" is casted to a char, which corresponds to the ASCII value of 'a'. The second print statement directly prints the char value of "letter2", which corresponds to the ASCII value of 'b'.
Therefore, the result of the code is "a b".Rate this question:
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Current Version
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Mar 20, 2023Quiz Edited by
ProProfs Editorial Team -
Jul 07, 2018Quiz Created by
Catherine Halcomb
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