Question

Key Takeaways

-To create 2 groups of 4 students (8 students in total)

-NEEDS random GPAs for each student

-No arrays

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app.java, student.java, and group.java as requested below.

app student group 1- creates 4 student objects First name 2- create a group object g1 using these 4 students name member 1 Last name 3- Using the group object g1 (instance, variable) in app.java member 2 Age member 3 GPA 3.1- Display the group name,and information about each student in the group member 4 getlnfo() semesterGPA() 3.2-Display the group average GPA getlnfo() averageGPA() 3.3-Display the semesterGPA of the third student in the group (retrieving information from the student class variables in the group, not from student variables in app) 4- create 4 new student objects (different from the previous 4 used to create g1) 5- create a group object g2 using these 4 students 6-repeat step #3 for the second group object g2

Please use the diagram above to help answer the Question:

Create a project that:

• Has a student class
  • Instance variables for Firstname, last name , and age
  • random generated GPA
  • methods to return getinfo and semesterGPA
    • Build upon the solutions of the previous labs (e.g., using app.java and student.java)
    • You will need a version of student.java that has a working semesterGPA( ) method as specified in the last assignment
      • Very important:
        • For this lab it is important that you run semesterGPA() just once.
        • When semesterGPA() is executed, it should update the GPA attribute
        • Again, for this lab it is necessary that the student GPA is calculated just once. Otherwise, the group average GPA will never match with the displayed values because of the randomness in semesterGPA
        • When should you run semesterGPA then?
          • Running it in the constructor seems a good choice
• Has a group class
  • group has a name
  • group has 4 students
  • group has at least 2 methods
    • A method that displays the group name and the name of each student in the group
    • A method that calculates and displays the average GPA of a group. Group average GPA is the average of all the group members' (students') GPA.
      • group GPA starts in student using the student GPA attribute.
      • For instance, we may have:
        • student #1, John, with a semesterGPA of 3.2;
        • student #2, Mary, with a semesterGPA of 3.5;
        • student #3, Emily, with a semesterGPA of 3.0, and
        • student #4, Peter, with a semesterGPA of 2.5,
        • which will give a group average GPA of (3.2 + 3.5 + 3.0 + 2.5)/4 = 3.05.
• in app.java (the class with the main method)
  • Create 4 student objects
  • Create a group object g1 using the 4 student objects above
  • Using the group object (instance, variable) in app.java:
    • Display the group name, and information about each student in the group
    • Display the group average GPA
    • Display the semesterGPA of the third student in the group (retrieving information from the student class variables in the group, not from student variables in the app).
    • Pay attention, you have to use the group object (instance, variable) in app.java
      • Something like System.out.println(g1.______________);
  • Repeat the same process for another group object g2.

Answer 1

code

solution

// Group.java public class Group String name; Student numberl; Student number2; Student number3; Student number4; public Group (String theName, Student thenumberl, Student thenumber2, Student thenumber3, Student thenumber4) name theName; number1 thenumberl; number2 thenumber2; number3 thenumber3; number4 - thenumber4; public String get_Info) f String groupInfo"Name of Group"name + "\n"+ "Name of Students in the Group" + "In"number1.get_Info () + "In"+ number2.get_Info) + "n"+ "\n" + number4.get Info(); number3.get Info return groupInfo;

public double average_GPAO double (number1 .зете 3ter-GPA ( ) number3.semester GPA () + average- number2.semester GPA) number. зете 3ter GPA ( ) ) return average; public double spStudentGPA (String theName) if (numberl.get_Name )-equals (theName)) number1 .зете 3ter GPA(); return else if (number2.get_Name ().equals (theName)) return number2.semesterGPA else if (number3.get_Name ().equals (theName)) return number3.semester GPA else return number4.semester GPA //App.java public class App f public static void main (String args])

Student stobji new Student ("Johny", "Bravo", 21, 3.2); Student stobj2 new Student ("Snoggle", "Joy", 17, 3.5) Student stobj3 new Student ("Dwayne", "Johnson", 21, 3.0) Student stobj4 new Student ("Sej", "Jai", 25, 2.5); // Create gl Group grl new Group ("grl", stobji, stobj2, stobj3, stobj4) // Display System.out.println("Group Information") System.out.println (gr1.get Info) System.out.println(" \nGroup Average:"+ gr1.average_GPA)) System.out.println(" \nSemester GPA "+ stobj3.get_Name () 18 + grl.spStudentGPA (stobj3.get_Name))) // Create 4 student Student stobj5 new Student ("John","Boy", 21, 7.86) Student stobj6 new Student ("Mary",Jni", 17, 8.97); Student 3tobj7 Student ("Emily", "Sharmi", 28, new 3.15) Student stobj8new Student ("Peter", "John", 20, 3.42);

// Create g2 Group gr2 ne Group ("g2", stobj5, stobj6, stobj7, stobj8); // Display System.out.println("\n\n\nGroup Information ") System.out.println(gr2. get Info)); System.out.println(" \nGroup Average: "+ gr2.average_GPA)) // Display System.out.println("\nSemester GPA of student"+ stobj7.get_Name)+"is" + gr2.spStudentGPA (stobj7.get_Name))) // Student.java public class Student l String fname; String lname; int age; double GPA; public Student (String fName, string IName, int the_age, double the_GPAt fname fName; lname 1Name; aqe the age GPA the GPA;

public String get_Info) f return fname +""+ lname "of age"+age+"scored GPA" GPA; public double semester_GPA) return GPA; public String get _Name return fname +" lname;

//output

E:javac Group.java E:\>javac Student-Java E:\>javac App-Java E:\〉java App Group Information Name of Group gr1 Name of Students in the Group Johny Bravo of age 21 scored GPA 3.2 Snoggle Joy of age 17 scored GPA 3.5 Dwayne Johnson of age 21 scored GPA 3.0 Sej Jai of age 25 scored GPA 2.5 roup Average: 3.05 Sene ster GPA Dwayne Johnson is - 3.0 Group Information Name of Group g2 Name of Students in the Group John Boy of age 21 scored GPA 7.86 Mary Janani of age 17 scored GPA 8.97? Emily Sharmi of age 28 scored GPA 3.15 Peter John of age 20 scored GPA 3.42 roup Average: 5.85 Semeste GPA of student Enily Sharmi is-3.15

//copyable code

// Group.java

public class Group {

   

    String name;

    Student number1;

    Student number2;

    Student number3;

    Student number4;

  

    public Group(String theName, Student thenumber1, Student thenumber2, Student thenumber3, Student thenumber4) {

        name = theName;

        number1 = thenumber1;

        number2 = thenumber2;

        number3 = thenumber3;

        number4 = thenumber4;

    }

  

    public String get_Info() {

       

        String groupInfo = "Name of Group " + name + "\n" + "Name of Students in the Group" + "\n" + number1.get_Info()

                + "\n" + number2.get_Info() + "\n" + number3.get_Info() + "\n" + number4.get_Info();

      

        return groupInfo;

    }

    public double average_GPA() {

      

        double average = (number1.semester_GPA() + number2.semester_GPA() + number3.semester_GPA() + number4.semester_GPA())

                / 4;

        return average;

    }

    public double spStudentGPA(String theName) {

        if (number1.get_Name().equals(theName))

            return number1.semester_GPA();

       else if (number2.get_Name().equals(theName))

            return number2.semester_GPA();

       else if (number3.get_Name().equals(theName))

            return number3.semester_GPA();

       else

            return number4.semester_GPA();

    }

}

//App.java

public class App {

   

    public static void main(String args[]) {

       

        Student stobj1 = new Student("Johny", "Bravo", 21, 3.2);

        Student stobj2 = new Student("Snoggle", "Joy", 17, 3.5);

        Student stobj3 = new Student("Dwayne", "Johnson", 21, 3.0);

        Student stobj4 = new Student("Sej", "Jai", 25, 2.5);

       // Create g1

        Group gr1 = new Group("gr1", stobj1, stobj2, stobj3, stobj4);

       // Display

        System.out.println("Group Information ");

        System.out.println(gr1.get_Info());

     

        System.out.println("\nGroup Average: " + gr1.average_GPA());

     

        System.out.println("\nSemester GPA " + stobj3.get_Name() + " is = "

                + gr1.spStudentGPA(stobj3.get_Name()));

       // Create 4 student

        Student stobj5 = new Student("John", "Boy", 21, 7.86);

        Student stobj6 = new Student("Mary", "Janani", 17, 8.97);

        Student stobj7 = new Student("Emily", "Sharmi", 28, 3.15);

        Student stobj8 = new Student("Peter", "John", 20, 3.42);

       // Create g2

        Group gr2 = new Group("g2", stobj5, stobj6, stobj7, stobj8);

       // Display

        System.out.println("\n\n\nGroup Information ");

        System.out.println(gr2.get_Info());

      

        System.out.println("\nGroup Average: " + gr2.average_GPA());

       // Display

        System.out.println("\nSemester GPA of student " + stobj7.get_Name() + " is = "

                + gr2.spStudentGPA(stobj7.get_Name()));

    }

}

// Student.java

public class Student {

   

    String fname;

    String lname;

    int age;

    double GPA;

    public Student(String fName, String lName, int the_age, double the_GPA) {

        fname = fName;

        lname = lName;

        age = the_age;

        GPA = the_GPA;

    }

    public String get_Info() {

        return fname + " " + lname + " of age " + age + " scored GPA " + GPA;

    }

    public double semester_GPA() {

        return GPA;

    }

    public String get_Name() {

        return fname + " " + lname;

    }

}