I\'m having trouble loading information from saved file (list.txt) into the arra

ID: 3815277 • Letter: I

Question

I'm having trouble loading information from saved file (list.txt) into the arraylist.

//Driver.java

import java.util.Scanner;
import java.util.regex.Pattern;
import java.util.regex.Matcher;
import java.util.ArrayList;
import java.io.IOException;
import java.io.FileNotFoundException;
import java.util.*;

public class Driver {
   static ArrayList<Student> studentList = new ArrayList<Student>();
   public static void main(String[] args) throws Exception {
       new Driver();

   }

   public Driver() throws Exception {
       Scanner input = new Scanner(System.in);

       System.out.println("Select an option below");
   System.out.println("");

   while(true) {
       System.out.println("1: Add Student");
       System.out.println("2: Display Student");
       System.out.println("3: Remove Student");
       System.out.println("4: Save Student List to a File");
       System.out.println("5: Load Student List from a File");
       System.out.println("0: Exit");

   int userChoice = input.nextInt();
   switch(userChoice) {
   case 1:
   addStudent();
   break;
   case 2:
       displayStudent();
   break;
   case 3:
       removeStudent();
       break;
   case 4:
       saveStudent();
       break;
   case 5:
       loadStudent();
       break;
   case 0:
   System.out.println("Thank you! See you again!");
   System.exit(0);
   }
   }
   }

   private void loadStudent() throws Exception {
       Scanner input = new Scanner(System.in);
       String loadFile;
       Student newStudent;
       System.out.println("Enter file name to load:");
       loadFile = input.nextLine();

       try {
           java.io.File file = new java.io.File(loadFile);
           Scanner reader = new Scanner(file);
           while(reader.hasNext()) {
               String[] list = reader.nextLine().split(",");
               newStudent = new Student();
               (newStudent).setFirstName(list[0]);
               (newStudent).setLastName(list[1]);
               (newStudent).setGender(list[2]);

           }
       reader.close();
       System.out.println("File has been loaded.");
       } catch(FileNotFoundException ex) {
           System.out.println("File not Found");
       }
   }




   private void saveStudent() throws Exception {
       try (
               java.io.PrintWriter output = new java.io.PrintWriter("StudentList.txt"); ) {
           if(studentList.isEmpty()) {
               System.out.println("Your List is Empty!");
               System.out.println("");
           } else {
               for(Student newStudent : studentList) {
               output.println(newStudent.getFirstName() + "," + newStudent.getLastName()
               + "," + newStudent.getGender());
           }
       }

   }

       System.out.println("Student List Saved!");
       System.out.println("");
   }




   private void addStudent() {
       Student newStudents = new Student();
       Scanner input = new Scanner(System.in);
       String FirstName, LastName, Gender, Major, NetID;
       double GPA;
       int Age, UIN;
       Student students;

       if(studentList.size() >= 3) {
           System.out.println("Your list is full!");
       } else {

       System.out.print("Enter First Name: ");
       FirstName = input.nextLine();
       System.out.print("Enter Last Name: ");
       LastName = input.nextLine();
       System.out.print("Enter Student Gender (M for Male and F for Female): ");
       Gender = input.nextLine();

       while(!Gender.equalsIgnoreCase("M") && !Gender.equalsIgnoreCase("F")) {
           System.out.print("Please select: M or F, Try Again: ");
           Gender = input.nextLine();
       }

       newStudents.setFirstName(FirstName);
       newStudents.setLastName(LastName);
       newStudents.setGender(Gender);

       studentList.add(studentList.size(), newStudents);

       System.out.println("Added!");
       System.out.println("");

   }
   }

   private void removeStudent() {
       Scanner input = new Scanner(System.in);
       String RemoveNetID;
       boolean found = false;

       if(studentList.isEmpty()){
           System.out.println("List is empty!");
           System.out.println("");
       } else {
           System.out.print("Enter NetID of Student to remove: ");
           RemoveNetID = input.nextLine();
           for(int i = 0; i < studentList.size(); i++) {
               if(studentList.get(i).getNetID().equalsIgnoreCase(RemoveNetID)) {
                   studentList.remove(i);
                   System.out.println("Removed!");
                   System.out.println("");
                   found = true;
                   break;
               }
           }
           if(found) {

           } else {
               System.out.println("No Match!");
               System.out.println("");
           }
       }

   }

   private void displayStudent() {
       if(studentList.isEmpty()) {
           System.out.println("List is empty!");
           System.out.println("");
       } else {
       System.out.println(" Student List : ");
       for(int i = 0; i < studentList.size(); i++) {
           System.out.println(studentList.get(i).toString());
           System.out.println("");
       }
       }

}
}

//Student.java

public class Student {

   private String FirstName;
   private String LastName;
   private String Gender;

   public Student(String FirstName, String LastName, String Gender) {
       this.FirstName = FirstName;
       this.LastName = LastName;
       this.Gender = Gender;

   }

   public Student() {

   }

   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 String getGender() {
       return Gender;
   }

   public void setGender(String Gender) {
       this.Gender = Gender;

   }

   public String toString() {
       return " First Name: " + FirstName + " Last Name: " + LastName +
               " Gender: " + Gender;
   }

}

//list.txt (this is the file i'm trying to load into the arraylist)

kelly,johnson,F
mike,green,M

Explanation / Answer

import java.util.Scanner;
import java.util.regex.Pattern;
import java.util.regex.Matcher;
import java.io.IOException;
import java.io.FileNotFoundException;
import java.util.*;
import java.lang.*;
import java.util.ArrayList;
class Driver {
static ArrayList<Student> studentList = new ArrayList<>();
public static void main(String[] args) throws Exception {
Scanner input = new Scanner(System.in);

System.out.println("Select an option below");
System.out.println("");

while(true) {
System.out.println("1: Add Student");
System.out.println("2: Display Student");
System.out.println("3: Remove Student");
System.out.println("4: Save Student List to a File");
System.out.println("5: Load Student List from a File");
System.out.println("0: Exit");

int userChoice = input.nextInt();
switch(userChoice) {
case 1:
addStudent();
break;
case 2:
displayStudent();
break;
case 3:
removeStudent();
break;
case 4:
saveStudent();
break;
case 5:
loadStudent();
break;
case 0:
System.out.println("Thank you! See you again!");
System.exit(0);
}
}
}

private static void loadStudent() throws Exception {
Scanner input = new Scanner(System.in);
String loadFile;
Student newStudent;
System.out.println("Enter file name to load:");
loadFile = input.nextLine();

try {
java.io.File file = new java.io.File(loadFile);
Scanner reader = new Scanner(file);
while(reader.hasNext()) {
String[] list = reader.nextLine().split(",");
newStudent = new Student();
(newStudent).setFirstName(list[0]);
(newStudent).setLastName(list[1]);
(newStudent).setGender(list[2]);

}
reader.close();
System.out.println("File has been loaded.");
} catch(FileNotFoundException ex) {
System.out.println("File not Found");
}
}




private static void saveStudent() throws Exception {
try (
java.io.PrintWriter output = new java.io.PrintWriter("StudentList.txt"); ) {
if(studentList.isEmpty()) {
System.out.println("Your List is Empty!");
System.out.println("");
} else {
for(Student newStudent : studentList) {
output.println(newStudent.getFirstName() + "," + newStudent.getLastName()
+ "," + newStudent.getGender());
}
}

}

System.out.println("Student List Saved!");
System.out.println("");
}




private static void addStudent() {
Student newStudents = new Student();
Scanner input = new Scanner(System.in);
String FirstName, LastName, Gender, Major, NetID;
double GPA;
int Age, UIN;
Student students;

if(studentList.size() >= 3) {
System.out.println("Your list is full!");
} else {
System.out.print("Enter First Name: ");
FirstName = input.nextLine();
System.out.print("Enter Last Name: ");
LastName = input.nextLine();
System.out.print("Enter Student Gender (M for Male and F for Female): ");
Gender = input.nextLine();

while(!Gender.equalsIgnoreCase("M") && !Gender.equalsIgnoreCase("F")) {
System.out.print("Please select: M or F, Try Again: ");
Gender = input.nextLine();
}

newStudents.setFirstName(FirstName);
newStudents.setLastName(LastName);
newStudents.setGender(Gender);

studentList.add(studentList.size(), newStudents);

System.out.println("Added!");
System.out.println("");
}
}

private static void removeStudent() {
Scanner input = new Scanner(System.in);
String RemoveNetID;
boolean found = false;

if(studentList.isEmpty()){
System.out.println("List is empty!");
System.out.println("");
} else {
System.out.print("Enter NetID of Student to remove: ");
RemoveNetID = input.nextLine();
for(int i = 0; i < studentList.size(); i++) {
System.out.println(studentList.get(i).toString());
boolean x=studentList.get(i).equalsIgnoreCase(RemoveNetID);
if(!x)
{

} else {
studentList.remove(i);
System.out.println("Removed!");
System.out.println("");
found = true;
break;
}
}
if(found) {

} else {
System.out.println("No Match!");
System.out.println("");
}
}

}

private static void displayStudent() {
if(studentList.isEmpty()) {
System.out.println("List is empty!");
System.out.println("");
} else {
System.out.println(" Student List : ");
for(int i = 0; i < studentList.size(); i++) {
System.out.println(studentList.get(i).toString());
System.out.println("");
}
}
}

private static Object getNetID() {
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
}
//Student.java

public class Student {

private String FirstName;
private String LastName;
private String Gender;

public Student(String FirstName, String LastName, String Gender) {
this.FirstName = FirstName;
this.LastName = LastName;
this.Gender = Gender;
}

public Student() {

}

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 String getGender() {
return Gender;
}

public void setGender(String Gender) {
this.Gender = Gender;

}


public String toString() {
return " First Name: " + FirstName + " Last Name: " + LastName +
" Gender: " + Gender;
}

Object getNetID() {
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}

/*boolean equalsIgnoreCase(String RemoveNetID) {
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}*/

boolean equalsIgnoreCase(String RemoveNetID) {
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
}

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