Grow a study session

Your goal is to add a data object to an array and trace the app's session state.

Back up your current work. Copy study Main, Question and the original shared ScoreDisplay into src/main/java/ using the switching steps.

Run the original session. Its answers are 3, true, 0. Predict whether a wrong answer loses a point and whether Next works before a correct answer. Try both. Wrong answers can retry; a correct answer awards one point and unlocks Next. This score counts questions eventually answered correctly, not first-try accuracy.

Question stores a prompt, answer and explanation. Its accepts() method compares the attempted text after trimming spaces and ignoring letter case. Main's Question[] stores references to these ordinary objects.

Find questionIndex, points, answered and finished. Explain why the array starts at index 0 while the displayed question number starts at 1. Trace checkAnswer(), nextQuestion(), showQuestion() and restartSession(). The boolean guard at the start of checkAnswer() prevents duplicate scoring.

Add this entry at the end of the questions array in Main. Put a comma after the previous entry to separate the two objects; keep the final }; that ends the array.

new Question("What is 9 % 4?", "1", "The remainder after division is 1.")

Leave the event handlers unchanged. Find the uses of questions.length that make progress, navigation and the final summary adapt to four questions. Replace your new question with one on another topic once this version works; update its answer and explanation together.

Action	Expected result for the four-question version
Wrong or blank answer	No point lost or gained; retry available; Next disabled
Correct answer, then try Check/Enter again	Exactly one point; input and Check disabled; Next enabled
Next before the last question	Next prompt; blank input; checking enabled; Next disabled again
Answer fourth question, then Next	Completion summary and score 4; no fifth question
Restart after completion	First question, score 0, blank input, Check enabled and Next disabled
Restart partway through a second run	Same reset behavior; no old score or answer survives

Finish the second run too. Check TRUE on the boolean question to test space and case handling. See the study app guide for the baseline rules.

Show your new question in a complete run. Explain what one Question object owns, what Main owns, and how the array length prevents a hard-coded three-question limit. Record a retry, a final summary and a restart check.