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Author: M-F-Tushar

OOP in Java/Chapter 10 - Object-Oriented Thinking/Code_Example/Exercise10_09.java

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+package ch_10;
+
+import java.util.Arrays;
+import java.util.Objects;
+
+/**
+ * Write a test program that creates a course, adds three students, removes one,
+ * and displays the students in the course.
+ */
+public class Exercise10_09 {
+    public static void main(String[] args) {
+        Course statistics = new Course("Statistics 341");
+        statistics.addStudent("Jillian Frometorgai");
+        statistics.addStudent("Shrezen Maticut");
+        statistics.addStudent("Phi Wazi");
+        statistics.dropStudent("Jillian Frometorgai");
+
+        System.out.println("Students in the course " + statistics.getCourseName() + " are: ");
+        for (String s : statistics.getStudents()) {
+            if (Objects.nonNull(s)) {
+                System.out.print(s + " ");
+            }
+        }
+    }
+}
+/**
+ * **10.9 (The Course class) Revise the Course class as follows:
+ * ■ The array size is fixed in Listing 10.6. Improve it to automatically increase
+ * the array size by creating a new larger array and copying the contents of the
+ * current array to it.
+ * ■ Implement the dropStudent method.
+ * ■ Add a new method named clear() that removes all students from the
+ * course.
+ */
+class Course {
+    private String courseName;
+    private String[] students = new String[100];
+    private int numberOfStudents;
+
+    public Course(String courseName) {
+        this.courseName = courseName;
+    }
+
+    public void addStudent(String student) {
+        if (student.length() < (numberOfStudents + 1)) {
+            students = Arrays.copyOf(students, students.length * 2);
+        }
+        students[numberOfStudents] = student;
+        numberOfStudents++;
+        System.out.println("Added student: " + student + " to the course: " + getCourseName());
+    }
+
+    public String[] getStudents() {
+        return students;
+    }
+
+    public int getNumberOfStudents() {
+        return numberOfStudents;
+    }
+
+    public String getCourseName() {
+        return courseName;
+    }
+
+    /**
+     * ■ Implement the dropStudent method.
+     *
+     * @param student to drop
+     */
+    public void dropStudent(String student) {
+        for (int i = 0; i < numberOfStudents; i++) {
+            if (students[i].equals(student)) {
+                students[i] = null;
+                break;
+            }
+        }
+        System.out.println("Dropped student: " + student + " has been dropped from " + getCourseName());
+    }
+
+    /**
+     * ■ Add a new method named clear() that removes all students from the
+     */
+    protected void clear() {
+        Arrays.fill(students, null);
+    }
+
+
+}