Question

JAVA PROGRAMMING

Part 1

1. Create a class Student, with attributes id, first name, last name. (All the attributes must be String)
   1. Create a constructor that accepts first name and last name to create a student object.
   2. Create appropriate getters and setters
2. Create another class StudentOperationClient, that contains a main program. This is the place where the student objects are created and other activities are performed.

• In the main program, create student objects, with the following first and last names.
• Chris Evans
• Mila Kunis
• Adam Sandler
• Emma Watson
• Jennifer Lawrence
• Dwayne Johnson.

• Once you create the student objects, use System.out.println, function to print the values in following format:
• First Name: XXXXXX , Last Name: XXXXXXXX

Part 2

3.       Create an integer attribute to student class, name it as studentScore. No getters and setters are needed for this attribute.

4.       When you create the Student object using the constructor, assign a random number to score attribute – random number should be between, 50 and 100.

5.       Create a new method in Student object, called getGrade(), that returns a String.

a.       The output method should return the following

If the score is >91, the return should be A,

Likewise B for >81 , C > 71, D > 61, and F for all others.

6.       Modify the StudentOperationsClient’s main program, to print the following.

First Name: XXXXXX , Last Name: XXXXXXXX    Letter Grade: XX

Part 3

1. Perform the steps 2, and 6, using arrays in Java. So instead of 6 different objects, you will create an array of 6 student objects and iterate them using a for loop.
2. Create a new method in student, getGradeDescription() – that returns a string and takes a String as input.

Use switch case control statements to return the following,

• A – Excellent
• B – Fair
• C – Average
• D – Poor
• F – Fail,

•&νβσπ;&νβσπ;&νβσπ;&νβσπ;&νβσπ;&νβσπ;&νβσπ;&νβσπ; and any other input as “INVALID”

• Once you create the student objects in the ARRAY, use System.out.println, function to print the values in following format:

First Name: XXXXXX , Last Name: XXXXXXXX Class Performance: <GradeDescription>

Answer 1

Thanks for the question.


Here is the completed code for this problem. 

Comments are included, go through it, learn how things work and let me know if you have any doubts or if you need anything to change. 

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Thanks


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public class Student {

    //Create a class Student, with attributes id, first name, last name. (All the attributes must be String)
    private String id;
    private String firstName;
    private String lastName;
    //Create an integer attribute to student class, name it as studentScore.
    private int studentScore;

    //Create a constructor that accepts first name and last name to create a student object.
    public Student(String firstName, String lastName) {
        this.firstName = firstName;
        this.lastName = lastName;
        id = "";
    }

    //Create a new method in student, getGradeDescription() – that returns a string and takes a String as input.

    public String getGradeDescription(String input) {

        char grade = input.charAt(0);
        switch (grade) {
            case 'A':
                return "A - Excellent";
            case 'B':
                return "B - Fair";
            case 'C':
                return "C - Average";
            case 'D':
                return "D - Poor";
            case 'F':
                return "F - Fail";
            default:
                return "INVALID";
        }
    }

    public Student(String firstName, String lastName, int studentScore) {
        this.firstName = firstName;
        this.lastName = lastName;
        this.studentScore = studentScore;
    }

    // Create a new method in Student object, called getGrade(), that returns a String.

    public String getGrade() {
        if (studentScore > 91) return "A";
        else if (studentScore > 81) return "B";
        else if (studentScore > 71) return "C";
        else if (studentScore > 61) return "D";
        else return "F";
    }


    //Create appropriate getters and setters
    public String getId() {
        return id;
    }

    public String getFirstName() {
        return firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setId(String id) {
        this.id = id;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }
}

====================================================================

public class StudentOperationClient {

    public static void main(String[] args) {


        Student ce = new Student("Chris","Evans");
        Student mk = new Student("Mila","Kunis");
        Student as = new Student("Adam","Sandler");
        Student ew = new Student("Emma","Watson");
        Student jl = new Student("Jennifer","Lawrence");
        Student dj = new Student("Dwayne","Johnson");

        Student[] students = new Student[6];
        students[0]=ce;
        students[1]=mk;
        students[2]=as;
        students[3]=ew;
        students[4]=jl;
        students[5]=dj;

        //Once you create the student objects, use System.out.println,
        // function to print the values in following format:
        //First Name: XXXXXX , Last Name: XXXXXXXX
        for(Student student:students)
            System.out.println("First Name: "+student.getFirstName()+", Last Name: "+student.getLastName());


         ce = new Student("Chris","Evans",91);
         mk = new Student("Mila","Kunis",81);
         as = new Student("Adam","Sandler",71);
         ew = new Student("Emma","Watson",61);
         jl = new Student("Jennifer","Lawrence",50);
         dj = new Student("Dwayne","Johnson",92);
        students[0]=ce;
        students[1]=mk;
        students[2]=as;
        students[3]=ew;
        students[4]=jl;
        students[5]=dj;

         for(Student student:students){
             System.out.println("First Name: "+student.getFirstName()+
                     ", Last Name: "+student.getLastName()+
                     ", Letter Grade: "+student.getGrade());
         }

        for(Student student:students){
            System.out.println("First Name: "+student.getFirstName()+
                    ", Last Name: "+student.getLastName()+
                    ", Class Performance: "+student.getGradeDescription(student.getGrade()));
        }

    }
}

===========================================================================

thank you !

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