Code demos from Lecture 3

src/main/java/uk/ac/cam/acr31/oop/democode1920/complicated/BadDate.java

+package uk.ac.cam.acr31.oop.democode1920.complicated;
+
+import java.util.Date;
+
+public class BadDate {
+
+  public static void main(String[] args) {
+
+    // Current date: 2019-11-13 11:00
+    Date d = new Date(2019, 11, 13, 11, 0);
+    System.out.println(d);
+  }
+}

src/main/java/uk/ac/cam/acr31/oop/democode1920/lecture3/MultipleChoiceQuestion.java

+package uk.ac.cam.acr31.oop.democode1920.lecture3;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class MultipleChoiceQuestion {
+
+  private final String prompt;
+  private final List<String> choices;
+  private final int correct;
+
+  public MultipleChoiceQuestion(String prompt, List<String> choices, int correct) {
+    this.prompt = prompt;
+    this.choices = new ArrayList<>(choices);
+    this.correct = correct;
+  }
+
+  void ask() {
+    System.out.println(prompt);
+    int i = 0;
+    for (String choice : choices) {
+      System.out.println(i + " " + choice);
+    }
+  }
+
+  boolean check(String response) {
+    int r = Integer.parseInt(response);
+    return r == correct;
+  }
+}

src/main/java/uk/ac/cam/acr31/oop/democode1920/lecture3/PrivateDemo.java

+package uk.ac.cam.acr31.oop.democode1920.lecture3;
+
+public class PrivateDemo {
+
+  private int x;
+
+  void add(PrivateDemo p) {
+    p.x = 6;
+  }
+}

src/main/java/uk/ac/cam/acr31/oop/democode1920/lecture3/Question.java

 package uk.ac.cam.acr31.oop.democode1920.lecture3;
 
 public class Question {
+
+  private final String prompt;
+  private final String solution;
+
+  public Question(String prompt, String answer) {
+    this.prompt = prompt;
+    this.solution = answer;
+  }
+
+  public void ask() {
+    System.out.println(prompt);
+  }
+
+  public boolean check(String solution) {
+    return this.solution.equals(solution);
+  }
+
+  String getPrompt() {
+    return prompt;
+  }
 }

src/main/java/uk/ac/cam/acr31/oop/democode1920/lecture3/Quiz.java

 package uk.ac.cam.acr31.oop.democode1920.lecture3;
 
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Scanner;
+
 public class Quiz {
+
+  void doQuiz() {
+
+    List<String> choices = new ArrayList<>(List.of("one", "two", "three"));
+    MultipleChoiceQuestion q = new MultipleChoiceQuestion("p", choices, 1);
+    choices.set(1, "hahaha!");
+
+    List<Question> questions =
+        List.of(
+            new Question("Should I indent source code with tabs or spaces?", "tabs"),
+            new Question("Which is the best college?", "mine"));
+
+    Scanner scanner = new Scanner(System.in);
+    int correct = 0;
+    for (Question question : questions) {
+      question.ask();
+      String response = scanner.nextLine();
+      if (question.check(response)) {
+        correct++;
+      }
+    }
+    System.out.printf("You got %d correct %n", correct);
+  }
+
+  public static void main(String[] args) {
+    Quiz quiz = new Quiz();
+    quiz.doQuiz();
+  }
 }