CSA College Board MCQ Blog

[TDWolff]

Overall Score: 27/40

Main Questions Incorrect:

• Q4
  • Answer Chosen: B
  • Correct Answer: C
  • Explanation: The code used int, not double, so there would be no decimal points, and the values would round down.
• Q6
  • Answer Chosen: C
  • Correct Answer: E
  • Explanation: To find the positive distance between two values, we need to use Math.abs to take the absolute value of the difference.
• Q7
  • Answer Chosen: E
  • Correct Answer: D
  • Explanation: The setName method is non-static, so it must be called with an object of Person using the dot operator.
• Q9
  • Answer Chosen: C
  • Correct Answer: B
  • Explanation: Since i starts at 1 instead of 0, the element at index 0 will be excluded from the sum.
• Q14
  • Answer Chosen: C
  • Correct Answer: E
  • Explanation: The ArrayList is named myVehicles, not Vehicle. The type Vehicle is an interface and does not contain a static get method.
• Q16
  • Answer Chosen: B
  • Correct Answer: D
  • Explanation: Using the value of k means some or all of the elements from a1 will not be in result, as they’ll be replaced with a2 values.
• Q18
  • Answer Chosen: E
  • Correct Answer: B
  • Explanation: The Math.random() method does not take parameters, so this statement will cause a compile-time error.
• Q22
  • Answer Chosen: E
  • Correct Answer: B
  • Explanation: The element at index 1 was initialized as a new Book object on line 3.
• Q23
  • Answer Chosen: D
  • Correct Answer: B
  • Explanation: List is an interface that ArrayList implements. This would be correct if the loop condition was k > 1 instead of k > 0.
• Q24
  • Answer Chosen: A
  • Correct Answer: D
  • Explanation: This answer would be correct if the algorithm filled newArray in row-major order rather than column-major order.
• Q30
  • Answer Chosen: B
  • Correct Answer: C
  • Explanation: The result chosen would occur if the first call to substring was word.substring(howFar, word.length()).
• Q37
  • Answer Chosen: E
  • Correct Answer: D
  • Explanation: Both Choice I and III work. However, Choice II will cause the while loop to iterate as long as x is not equal to 6.
• Q38
  • Answer Chosen: B
  • Correct Answer: A
  • Explanation: The expression will always evaluate to true since x is always either greater than 1000 or less than 1500.

Improvement Plan

To improve my score, I should focus on being more careful with syntax and understanding the specific requirements of methods, particularly around:

• Data Types, Method Parameters, and Return Types
• Static vs. Non-Static Contexts: Recognize when a method or variable requires an instance of the class versus when it can be accessed directly.
• Loops and Conditionals: Practice tracing through loops and conditionals to avoid mistakes in initialization and flow control, especially when dealing with arrays and ArrayLists.

  Study and Practice Recommendations

• Java Documentation Review: Familiarize myself with commonly used classes like Math and ArrayList to better understand method constraints.
• Practice Exercises: Small exercises on platforms like LeetCode will help reinforce my skills with indexing, initialization, and logical flow.
• By focusing on these areas, I’ll improve my precision in understanding exactly what each code-related question asks.

[Th35py27]

Explanation is brief, it tells what he missed on, and talks about study procedures to get a better score. Could've added image to reference back the questions and add code blocks from last trimester for the second part of the assignment, which is to talk about important code.