Using Java Write a program that reads in a student file and creates Student.java

ID: 3825690 • Letter: U

Question

Using Java Write a program that reads in a student file and creates Student.java objects with the following fields: first name, last name, GPA, and student ID. The objects will be stored in an array of Students in a class named StudentSearcher.java. Provide the user with a list of possible student IDs to search from. When a user enters in a student ID, the program will search the array and display the found student's GPA. The program will continue to search students until the user exits the program.

Explanation / Answer

studentsdata.txt (Save this file under D Drive.Then the path of the file pointing to it is D:\studentsdata.txt t)

Williams Kane 4.5 1111
Mitchel Johnson 4.0 2222
Pat Simkox 4.5 3333
Ricky Pointing 4.0 4444
Rahul Dravid 3.5 5555
Saurav Gangully 3.0 6666

__________________

Student,java

public class Student {
   //Declaring instance variables
   private String firstname;
   private String lastname;
   private double GPA;
   private int id;

   //Parameterized constructor
   public Student(String firstname, String lastname, double gPA, int id) {
       super();
       this.firstname = firstname;
       this.lastname = lastname;
       GPA = gPA;
       this.id = id;
   }

   //getters and setters
   public String getFirstname() {
       return firstname;
   }
   public void setFirstname(String firstname) {
       this.firstname = firstname;
   }
   public String getLastname() {
       return lastname;
   }
   public void setLastname(String lastname) {
       this.lastname = lastname;
   }
   public double getGPA() {
       return GPA;
   }
   public void setGPA(double gPA) {
       GPA = gPA;
   }
   public int getId() {
       return id;
   }
   public void setId(int id) {
       this.id = id;
   }

   //toString method is used to display the contents of an object inside it
   @Override
   public String toString() {
       return "Student [firstname=" + firstname + ", lastname=" + lastname
               + ", GPA=" + GPA + ", id=" + id + "]";
   }

}

___________________

package org.students;

import java.io.File;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.Scanner;

public class StudentsSearcher {

   public static void main(String[] args) {

       //Declaring variables
       String fname,lname;
       double gpa;
       int id;
       Student st=null;
       Scanner sc=null;

       //Creating an ArrayList Object which holds Students Object
       ArrayList<Student> arl=new ArrayList<Student>();

       //Opening an File
File inFile = new File("D:\studentsdata.txt");

try {
           sc = new Scanner (inFile);

           /* Reading the contents of the file and creating
           * Student class object by passing values as arguments
           */
while (sc.hasNextLine())
{
fname = sc.next();
lname=sc.next();
gpa=Double.parseDouble(sc.next());
id=Integer.parseInt(sc.next());

//Creating the student class object
st=new Student(fname, lname,gpa, id);

//Adding student class obejct to the ArrayList
arl.add(st);

}

       } catch (FileNotFoundException e) {

           e.printStackTrace();
       }
finally
{
   sc.close();
}

//Scanner object is used to get the inputs entered by the user
sc=new Scanner(System.in);

//Displaying all student Id's
while(true)
{
   System.out.println(" Dislpaying Id's :");

for(int i=0;i<arl.size();i++)
{
    System.out.println(arl.get(i).getId());
}

//getting the user entered Id for search
System.out.print(" Select Id:");
int searchId=sc.nextInt();

//Calling the method for search
int index=searchById(searchId,arl);
if(index==-1)
{
    System.out.println("** Invalid Id **");
    continue;
}
else
    System.out.println("Student GPA :"+arl.get(index).getGPA());

//Getting the character from the user 'Y' or 'y' or 'N' or 'n'
System.out.print("Do you want to continue(Y/N) ::");
char ch = sc.next(".").charAt(0);
if(ch=='Y'||ch=='y')
continue;
else
{
System.out.println(":: Program Exit ::");
break;
}

}

   }

/* This method will return the index of the
* student if the user entered valid Student Id
*/
   private static int searchById(int searchId, ArrayList<Student> arl) {

       for(int i=0;i<arl.size();i++)
       {
           if(searchId==arl.get(i).getId())
               return i;
       }
       return -1;
   }

}

___________________

Output:

Dislpaying Id's :
1111
2222
3333
4444
5555
6666

Select Id:1111
Student GPA :4.5
Do you want to continue(Y/N) ::Y

Dislpaying Id's :
1111
2222
3333
4444
5555
6666

Select Id:1224
** Invalid Id **

Dislpaying Id's :
1111
2222
3333
4444
5555
6666

Select Id:6666
Student GPA :3.0
Do you want to continue(Y/N) ::N
:: Program Exit ::

________________Thank You

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