The only issue I am having is getting the try & catch blocks to work. The code is required to notify the users when wrong input is entered. But it doesn't work


import java.io.*;
import java.nio.file.StandardOpenOption.*;
import java.nio.file.*;
import java.util.*;

class StudentsStanding {

public static void main(String [] args) throws IOException {

Path probationListPath = Paths.get("Probation.txt");
Path fullProbationListPath = probationListPath.toAbsolutePath();
Path goodStandingListPath = Paths.get("GoodStanding.txt");
Path fullGoodStandingListPath = goodStandingListPath.toAbsolutePath();
Path deansListPath = Paths.get("DeansList.txt");
Path fullDeansListPath = deansListPath.toAbsolutePath();

OutputStream probationList = new BufferedOutputStream(Files.newOutputStream(fullProbationListPath));
OutputStream goodStandingList = new BufferedOutputStream(Files.newOutputStream(fullGoodStandingListPath));
OutputStream deansList = new BufferedOutputStream(Files.newOutputStream(fullDeansListPath));

InputStream probation = new BufferedInputStream(Files.newInputStream(probationListPath));
BufferedReader probationReader = new BufferedReader(new InputStreamReader(probation));
InputStream goodStanding = new BufferedInputStream(Files.newInputStream(goodStandingListPath));
BufferedReader goodStandingReader = new BufferedReader(new InputStreamReader(goodStanding));
InputStream deans = new BufferedInputStream(Files.newInputStream(deansListPath));
BufferedReader deansReader = new BufferedReader(new InputStreamReader(deans));

Scanner input = new Scanner(System.in);
int numStudents;
String[] firstName, lastName, idNumber;
double[] GPA;

System.out.println("How many student's would you like to register?");;
numStudents = input.nextInt();
firstName = new String[numStudents];
lastName = new String[numStudents];
idNumber = new String[numStudents];
GPA = new double[numStudents];
int counter = 0;
boolean isDeansList = false;
boolean successful = false;

try {

for(int i = 0; i < firstName length; i++) {
System.out.println("Now adjusting student # " + (i+1));
System.out.println("First name: ");
input.nextLine(); [removed]input.nextLine().toUpperCase();
System.out.println("Last name: "); [removed]input.nextLine().toUpperCase();
System.out.println("New ID number: "); [removed]input.nextLine();
System.out.println("GPA: "); [removed]input.nextDouble();
}
String s = "";
byte[] toBytes;
String writeToProbationFile, writeToDeansFile, writeToGoodStandingFile;

System.out.println("---Students entered---\n");
for(int [removed]0; i < firstName.length; i++) {
if(GPA[i] [removed]2.0) {
System.out.println("Students on Academic Probation:");
break;
}
}

for(int [removed]0; i < firstName.length; i++) {
if(GPA[i] [removed]2.0) {
writeToProbationFile = "First name: " + firstName[i] + "\nLast Name: " + lastName[i] + "\nID #: " + idNumber[i] +"\nGPA: "+ GPA[i] +"\n\n"; [removed]writeToProbationFile.getBytes();
System.out.println("Student: " + firstName[i] + " " + lastName[i] + "\nID number: " + idNumber[i] + "\nGPA: " + GPA[i] + "\n");
probationList.write(toBytes);
}
}

for(int [removed]0; i < firstName.length; i++) {
if(GPA[i]> 2.0) {
System.out.println("Students in Good Standing");
break;
}
}

for(int i = 0; i < firstName.length; i++) {
if(GPA[i] >= 3.5)
isDeansList = true;
if(GPA[i] > 2.0){
writeToGoodStandingFile = "First Name: " + firstName[i] + "\nLast Name: " + lastName[i] + "\nID #: " + idNumber[i] +"\nGPA: "+ GPA[i] +"\n\n";
toBytes = writeToGoodStandingFile.getBytes();
System.out.println("Student: " + firstName[i] + " " + lastName[i] + "\nID number: " + idNumber[i] + "\nGPA: " + GPA[i] + "\n");
goodStandingList.write(toBytes);
counter++;
}
}
probationList.close();
goodStandingList.close();

String[] readFirst = new String[counter];
String[] readLast = new String[counter];
String[] readID = new String[counter];
String[] readGPA = new String[counter];
int counter1 = 0;
double GPARead = 0;
String first = "", last = "", id = "";
double GPAKeeper = 0.0;
if(isDeansList) {
System.out.println("---Deans list---");
while((s = goodStandingReader.readLine()) != null) {
if(s.startsWith("First Name: ")) {
first = s.substring(12);
}
else if(s.startsWith("Last Name: ")) {
last = s.substring(11);
}
else if(s.startsWith("ID #: ")) {
id = s.substring(6);
}
else if(s.startsWith("GPA: ")) {
GPAKeeper = Double.parseDouble(s.substring(5));
if (GPAKeeper >= 3.5) {
System.out.println("Student: " + first + " " + last + "\nID #: " +
id + "\nGPA: " + GPAKeeper);
}
}
counter++;
}
}
}
catch(InputMismatchException e) {
System.out.println("Wrong output");
}
probationReader.close();
goodStandingReader.close();
deansReader.close();