Question

2. The Student Database Class: The object of this class should store a list of up to 10 objects of the Student class. This class should have private Student[] Students and private int NumStudents as member variables. The class should have only one constructor (given below) public Student Database (int num) NumStudents = num; Students = new Student[numStudents]; /*you need to update NumStudents when you add, remove Students. Also, you need to make sure NumStudents doesn't exceed 10. This class should support the following methods (See below). You can add additional methods if you need to. Keep in mind; the maximum number of Students is 10. In the methods, you need to make sure that the database doesn't allow the user to add more than 10 Students. To make things easier let us assume no two Students have the same name. In any of the search methods, if the Student cannot be found, you should display that the Student wasn't found in the database. 0 Add a new Student to the Student Database through a series of inputs (from keyboard) from the user. public void AddStudent () // not more than 10 Students in the database allowed



I need code in java

The Student class:

CODE IN JAVA:

Student.java file:

public class Student {
   private String name;
   private double gpa;
   private int idNumber;

   public Student() {
       this.name = "";
       this.gpa = 0;
       this.idNumber = 0;
   }

   public Student(String name, double gpa, int idNumber) {
       this.name = name;
       this.gpa = gpa;
       this.idNumber = idNumber;
   }

   public Student(Student s) {
       this.name = s.name;
       this.gpa = s.gpa;
       this.idNumber = s.idNumber;
   }

   public String getName() {
       return name;
   }

   public void setName(String name) {
       this.name = name;
   }

   public double getGpa() {
       return gpa;
   }

   public void setGpa(double gpa) {
       this.gpa = gpa;
   }

   public int getIdNumber() {
       return idNumber;
   }

   public void setIdNumber(int idNumber) {
       this.idNumber = idNumber;
   }

}

Answer 1

Code:

Output:

Raw Code:

class Student{
   String name; // student name
   Student(String name){
       this.name = name; // storing student name
   }
}
class StudentDatabase{
   // declaring private variables
   private int NumStudents;
   private Student Students[];
   private int index = 0; // it is nothing but no of students present currently in the Students list
   StudentDatabase(int num){
       if (num > 10){ // if given num is greater then 10 then print error message
           System.out.println("The students size is soo large.");
       }
       else{ // otherwise assign it to NumStudents
           this.NumStudents = num;
           this.Students = new Student[NumStudents]; // creating Students list
       }
   }
   void addStudent(Student stu){ // addStudent method
       if (index == 10 || index==NumStudents){ // if the no of students is equal to 10 or if the no of students is equal to NumStudents
                                               // then print error message
           System.out.println("The Class is Full");
       }
       else{ // other wise add student to Students list
           Students[index] = stu;
           System.out.println("Student " + stu.name + " is added"); // printing name of the student
           index++; // incrementing no of students present currently in the Students list
       }
   }
   void removeStudent(Student stu){
       if (index==0){ // if there is no students in the list
           System.out.println("There is no students in the class");
       }
       else{
           int found = -1; // declaring variable
           for (int i=0;i<index ;i++ ) { // iterate through each student in list
               if (Students[i].name.equals(stu.name)){//checking student name with the given name if it is equal then assign i value to found.
                   found = i;
                   break; // break the loop
               }
           }
           if (found != -1){
               int i;
               for (i=found; i<index - 1; i++) {
                   Students[i] = Students[i+1]; // from removed student to last student, moving each student back
               }
               System.out.println("Student " + stu.name + " is removed"); // printing removed student name
               Students[i] = null; // assigning null value
               index--; // decrementing no of students present currently in the Students list
           }
           else{ // if the not found in the list with the given name
               System.out.println("There is no student with name " + stu.name + " in the class");
           }
       }
   }
   void displayStudents(){ // displayStudents method
       System.out.println("Studens List :");
       for (int i=0;i<index ;i++ ) { // iterate through each student
           System.out.println(Students[i].name); // printing each student name
       }
   }
}
public class Main{
   public static void main(String[] args) {
       StudentDatabase cls = new StudentDatabase(5); // creating StudentDatabase object
       // adding students to Students list
       cls.addStudent(new Student("A"));
       cls.addStudent(new Student("B"));
       cls.addStudent(new Student("C"));
       cls.addStudent(new Student("D"));
       cls.addStudent(new Student("E"));
       cls.addStudent(new Student("F"));
       cls.displayStudents(); // calling displayStudenst methos
       // calling removeStudent method
       cls.removeStudent(new Student("A"));
       cls.removeStudent(new Student("Z"));
   }
}

If you have any doubts feel free to comment in comment section.

DO VOTE(LIKE).