10/13

Balloon.java

@@ -0,0 +1,23 @@
+public class Balloon {
+    private double radius;
+
+    public Balloon() {
+        radius = 0;
+    }
+
+    public void inflate(double amount) {
+        radius += amount;
+    }
+
+    public double getVolume() {
+        return 4.0 / 3.0 * Math.PI * Math.pow(radius, 3);
+    }
+
+
+    public static void main(String... args) {
+        Balloon balloon = new Balloon();
+        balloon.inflate(10);
+        System.out.println("Balloon volume: " + balloon.getVolume());
+    }
+}
+

Student.java

@@ -0,0 +1,28 @@
+public class Student {
+    private String name;
+    private int totalQuizScore;
+    private int numberOfQuizzes;
+
+    public Student(String name) {
+        this.name = name;
+        this.totalQuizScore = 0;
+        this.numberOfQuizzes = 0;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void addQuiz(int score) {
+        totalQuizScore += score;
+        numberOfQuizzes++;
+    }
+
+    public int getTotalScore() {
+        return totalQuizScore;
+    }
+
+    public int getAverageScore() {
+        return totalQuizScore / numberOfQuizzes;
+    }
+}

StudentTester.java

@@ -0,0 +1,11 @@
+public class StudentTester {
+    public static void main(String... args) {
+        Student student = new Student("John Doe");
+        student.addQuiz(10);
+        student.addQuiz(20);
+        student.addQuiz(30);
+        System.out.println("Student name: " + student.getName());
+        System.out.println("Student total score: " + student.getTotalScore());
+        System.out.println("Student average score: " + student.getAverageScore());
+    }
+}