init

lab/lab3/Question2/Student.java

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+/*
+ * Author: CHEN Yongyuan (Walter) 1930006025 from OOP(1007)
+ * Date: 2022/03/03
+ * Description: Student class
+ */
+
+public class Student {
+    /**
+     * Student's ID number
+     */
+    private int ID;
+
+    /**
+     * Constructor A public constructor with one parameter
+     * 
+     * @param id   the ID of the student, only accept positive integer if the id is
+     *             not positive, it will be set to 0
+     */
+    public Student(int ID) {
+        if (ID > 0) {
+            this.ID = ID;
+        } else {
+            this.ID = 0;
+        }
+    }
+
+    /**
+     * Getter A public getter for the ID.
+     * 
+     * @return the ID of the student
+     */
+    public int getID() {
+        return ID;
+    }
+
+    /**
+     * Test method A public method to test the class
+     *
+     * @return void
+     */
+    public static void testStudent() {
+        Student s1 = new Student(-39);
+        Student s2 = new Student(114514);
+        Student s3 = new Student(0);
+
+        // print true
+        System.out.println(s1.getID() == 0);
+        System.out.println(s2.getID() == 114514);
+        System.out.println(s3.getID() == 0);
+    }
+}