Lab Assignment #7 :: CPTR 105 :: 5/1/09

Write a class Student that represents, of course, a student. The attributes that a student should have (implemented as instance variables) are:

• name,
• id (which is a number), and
• names and percentage grades for three courses that the student is taking this semester.

You will probably have 8 instance variables to represent these attributes.

You will also implement these methods:

• setupValues(): similar to a method in the Person class we wrote, this will ask the user for values for the instance variables for a Student object (using the Scanner class).
• printInfo(): when this method is called on a Student object it will print out all its information (the attributes).
• getName(): this method simply returns the name of the student.
• getAverage(): when this method is called on a Student object it will return the average percentage grade of all three courses.

After implementing the class, test it by creating Student objects in a separate test class’s main() method, and calling methods on these objects. For example:

// create objects for 
Student s1 = new Student();
Student s1 = new Student();

// setup attribute values
s1.setupValues();
s2.setupValues();

// print out student info
s1.printInfo();
s2.printInfo();

// print out the average grades
System.out.println("Average grade for " + s1.getName() + " is " + s1.getAverage());
System.out.println("Average grade for " + s2.getName() + " is " + s2.getAverage());

Solution

import java.util.Scanner;
public class Student {


    String name;
    int id;
    String class1;
    int grade1;
    String class2;
    int grade2;
    String class3;
    int grade3;

    void setupValues(){
        Scanner keyboard = new Scanner(System.in);
        System.out.println("Enter the student's name.");
        name = keyboard.nextLine();
        System.out.println("Enter the student's ID.");
        idnumber = keyboard.nextInt();
        keyboard.nextLine();
        System.out.println("Enter the student's classes.");
        class1 = keyboard.nextLine();
        class2 = keyboard.nextLine();
        class3 = keyboard.nextLine();
        System.out.println("Enter the student's grades.");
        grade1 = keyboard.nextInt();
        grade2 = keyboard.nextInt();
        grade3 = keyboard.nextInt();
    }
    void printInfo(){
        System.out.println("Student name: " + name);
        System.out.println("Student ID: " + idnumber);
        System.out.println("Student's classes: " + class1 + ", " + class2 + ", " + class3 + ".");
        System.out.println("Student grades: " + grade1 + ", " + grade2 + ", " + grade3 + ".");
    }
    String getName(){
        return name;
    }
    int getAverage(){
        return (grade1 + grade2 + grade3)/3;
    }
}