import java.text.DecimalFormat; // Class representing a studentpublic class Student { private String first; // first nameprivate String last; // last nameprivate double gpa; // grade point average // Student class constructorpublic Student(String first, String last, double gpa) {this.first = first; // first namethis.last = last; // last namethis.gpa = gpa; // grade point average} public double getGPA() {return gpa;} public String getLast() {return last;} // Returns a String representation of the Student object, with the GPA formatted to one decimalpublic String toString() {DecimalFormat fmt = new DecimalFormat("#.0");return first + " " + last + " " + "(GPA: " + fmt.format(gpa) + ")";}}public class LabProgram { public static void main(String args[]) { Scanner scnr = new Scanner(System.in); Course course = new Course(); int beforeCount; // Example students for testing course.addStudent(new Student("Henry", "Nguyen", 3.5)); course.addStudent(new Student("Brenda", "Stern", 2.0)); course.addStudent(new Student("Lynda", "Robison", 3.2)); course.addStudent(new Student("Sonya", "King", 3.9)); Student student = course.findStudentHighestGpa(); System.out.println("Top student: " + student); } } Complete the Course class by implementing the `findStudentHighestGpa()` method, which returns the Student object with the highest GPA in the course. Assume that no two students have the same highest GPA.Given classes:- **Class LabProgram** contains the main method for testing the program.- **Class Course** represents a course, which contains an ArrayList of Student objects as a course roster. *(Type your code in here.)*- **Class Student** represents a classroom student, which has three fields: first name, last name, and GPA. *(Hint: `getGPA()` returns a student’s GPA.)***Note:** For testing purposes, different student values will be used.**Example:** For the following students:```Henry Nguyen 3.5Brenda Stern 2.0Lynda Robison 3.2Sonya King 3.9```The output is:```Top student: Sonya King (GPA: 3.9)``` **Title: Understanding Java Classes and ArrayLists****Current File: Course.java**In this example, we explore basic Java programming concepts, specifically focusing on classes and the use of ArrayLists to manage collections of objects.```javaimport java.util.ArrayList;public class Course { private ArrayList roster; // Collection of Student objects public Course() { roster = new ArrayList(); } public Student findStudentHighestGpa() { /* Type your code here */ } public void addStudent(Student s) { roster.add(s); }}```### Explanation:1. **Import Statement** - `import java.util.ArrayList;`: This line imports the `ArrayList` class from the `java.util` package, allowing the program to use dynamic arrays.2. **Class Declaration** - `public class Course {`: Declares a public class named `Course`.3. **Attributes** - `private ArrayList roster;`: Declares a private attribute `roster`, which is an `ArrayList` to store a collection of `Student` objects.4. **Constructor** - `public Course() {`: Defines the constructor for the `Course` class. - `roster = new ArrayList();`: Initializes `roster` as a new `ArrayList` of `Student` objects.5. **Methods** - `public Student findStudentHighestGpa() {`: A public method skeleton intended to find the student with the highest GPA. The implementation is left for future coding. - `public void addStudent(Student s) {`: A public method to add a `Student` object to the `roster`. - `roster.add(s);`: Adds the student `s` to the `roster` ArrayList.This example illustrates how to manage a collection of student objects using an `ArrayList` in a Java class. The method `findStudentHighestGpa` suggests that the class could include functionality to compare and find specific student data based on GPA.

import java.text.DecimalFormat; // Class representing a student public class Student { private String first; // first name private String last; // last name private double gpa; // grade point average // Student class constructor public Student(String first, String last, double gpa) { this.first = first; // first name this.last = last; // last name this.gpa = gpa; // grade point average } public double getGPA() { return gpa; } public String getLast() { return last; } // Returns a String representation of the Student object, with the GPA formatted to one decimal public String toString() { DecimalFormat fmt = new DecimalFormat("#.0"); return first + " " + last + " " + "(GPA: " + fmt.format(gpa) + ")"; } } public class LabProgram { public static void main(String args[]) { Scanner scnr = new Scanner(System.in); Course course = new Course(); int beforeCount; // Example students for testing course.addStudent(new Student("Henry", "Nguyen", 3.5)); course.addStudent(new Student("Brenda", "Stern", 2.0)); course.addStudent(new Student("Lynda", "Robison", 3.2)); course.addStudent(new Student("Sonya", "King", 3.9)); Student student = course.findStudentHighestGpa(); System.out.println("Top student: " + student); } }

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

import java.text.DecimalFormat;

// Class representing a student

public class Student {

private String first; // first name

private String last; // last name

private double gpa; // grade point average

// Student class constructor

public Student(String first, String last, double gpa) {

this.first = first; // first name

this.last = last; // last name

this.gpa = gpa; // grade point average

}

public double getGPA() {

return gpa;

}

public String getLast() {

return last;

}

// Returns a String representation of the Student object, with the GPA formatted to one decimal

public String toString() {

DecimalFormat fmt = new DecimalFormat("#.0");

return first + " " + last + " " + "(GPA: " + fmt.format(gpa) + ")";

}

public class LabProgram {
public static void main(String args[]) {
Scanner scnr = new Scanner(System.in);
Course course = new Course();
int beforeCount;

// Example students for testing
course.addStudent(new Student("Henry", "Nguyen", 3.5));
course.addStudent(new Student("Brenda", "Stern", 2.0));
course.addStudent(new Student("Lynda", "Robison", 3.2));
course.addStudent(new Student("Sonya", "King", 3.9));

Student student = course.findStudentHighestGpa();
System.out.println("Top student: " + student);
}
}

Complete the Course class by implementing the `findStudentHighestGpa()` method, which returns the Student object with the highest GPA in the course. Assume that no two students have the same highest GPA.

Given classes:
- **Class LabProgram** contains the main method for testing the program.
- **Class Course** represents a course, which contains an ArrayList of Student objects as a course roster. *(Type your code in here.)*
- **Class Student** represents a classroom student, which has three fields: first name, last name, and GPA. *(Hint: `getGPA()` returns a student’s GPA.)*

**Note:** For testing purposes, different student values will be used.

**Example:** For the following students:

```
Henry Nguyen 3.5
Brenda Stern 2.0
Lynda Robison 3.2
Sonya King 3.9
```

The output is:

```
Top student: Sonya King (GPA: 3.9)
```

**Title: Understanding Java Classes and ArrayLists**

**Current File: Course.java**

In this example, we explore basic Java programming concepts, specifically focusing on classes and the use of ArrayLists to manage collections of objects.

```java
import java.util.ArrayList;

public class Course {
private ArrayList<Student> roster; // Collection of Student objects

public Course() {
roster = new ArrayList<Student>();
}

public Student findStudentHighestGpa() {
/* Type your code here */
}

public void addStudent(Student s) {
roster.add(s);
}
}
```

### Explanation:
1. **Import Statement**
- `import java.util.ArrayList;`: This line imports the `ArrayList` class from the `java.util` package, allowing the program to use dynamic arrays.

2. **Class Declaration**
- `public class Course {`: Declares a public class named `Course`.

3. **Attributes**
- `private ArrayList<Student> roster;`: Declares a private attribute `roster`, which is an `ArrayList` to store a collection of `Student` objects.

4. **Constructor**
- `public Course() {`: Defines the constructor for the `Course` class.
- `roster = new ArrayList<Student>();`: Initializes `roster` as a new `ArrayList` of `Student` objects.

5. **Methods**
- `public Student findStudentHighestGpa() {`: A public method skeleton intended to find the student with the highest GPA. The implementation is left for future coding.
- `public void addStudent(Student s) {`: A public method to add a `Student` object to the `roster`.
- `roster.add(s);`: Adds the student `s` to the `roster` ArrayList.

This example illustrates how to manage a collection of student objects using an `ArrayList` in a Java class. The method `findStudentHighestGpa` suggests that the class could include functionality to compare and find specific student data based on GPA.

Expert Solution

Step 1: Providing the algorithm

1. Create a class named Student with private fields: first (String), last (String), and gpa (double).

2. Implement a constructor in the Student class to initialize first, last, and gpa.
3. Implement getGPA() method in the Student class to retrieve the GPA of the student.
4. Override toString() method in the Student class to return a formatted string representation of the student.

5. Create a class named Course with an ArrayList of Student objects named roster.
6. Implement a method named findStudentHighestGpa() in the Course class.
7. Initialize a Student object variable (highestGpaStudent) to null to keep track of the student with the highest GPA.
8. Iterate through the roster list:
a. For each student, compare their GPA with the GPA of highestGpaStudent.
b. If the student's GPA is higher, update highestGpaStudent with the current student.
9. After iterating through the roster, highestGpaStudent will contain the student with the highest GPA.
10. Return highestGpaStudent from the findStudentHighestGpa() method.

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