Test Student Marks Using Private Keyword - Java Example Program

class TestStudentMarksImproved
{
    public static void main(String arg[])
    {
        Student madhavan = new Student("Madhavan");
        
        madhavan.setMarks(87, 65, 93);
        
        System.out.println("Subject 1 = " + madhavan.getSubject1Marks());
        System.out.println("Subject 2 = " + madhavan.getSubject2Marks());
        System.out.println("Subject 3 = " + madhavan.getSubject3Marks());
        System.out.println("Total = " + madhavan.getTotalMarks());
        
        
        // LINE X - THROWS COMPILATION ERROR
        // madhavan.subject1 = 87; 
        // LINE Y - THROWS COMPILATION ERROR
        // System.out.println("Subject 1 = " + madhavan.subject1);
        
    
    }
}

class Student
{
    private String name;
    private int subject1;
    private int subject2;
    private int subject3;
    private int total_marks;

    Student(String name)
    {
        this.name = name;
    }

    void setMarks(int subject1, int subject2, int subject3)
    {
        this.subject1 = subject1;
        this.subject2 = subject2;
        this.subject3 = subject3;

        this.total_marks = subject1 + subject2 + subject3; // LINE A
    }

    int getSubject1Marks()
    {
        return subject1; // LINE B
    }

    int getSubject2Marks()
    {
        return subject2;
    }

    int getSubject3Marks()
    {
        return subject3;
    }

    int getTotalMarks()
    {
        return total_marks;
    }
}