Cant find variables?

I am working on this program in which im trying to gather information about certain things. But when i try to compile it says a variable is not found, even though it is clearly defined. Its not quite completely funciontal yet so... bare with it.

Also i am jsut learnign about inheritances so likely its a problem with the way its declared.

also i know there is a lot commented out, but i did that after realize that i think i did it wrong.

Its saying grad year cannot be found but all the other variable from the parent class work. Any Suggestions?

Code:

---

    class HighSchool extends Project8Driver
  {
      public HighSchool()
      {
        int gradYear;
        System.out.print("What year do you plan to graduate? ");
        gradYear = scan.nextInt();
        System.out.print("How many credits do you need to aquire before you can graduate? ");
        int credLeft = scan.nextInt();
        System.out.print("What did you score on the SAT? ");
        int SAT = scan.nextInt();
        System.out.print("How many AP credits do you have? ");
        int apCred = scan.nextInt();
     
      }
 
      public String toString()
      {
        return "Name: " +name+ "\nAge: "+age+ "\nID: "+id+"\n Graduation year: " + gradYear;
      }
 
  }

---

Code:

---

  import java.util.Scanner;
    class Project8Driver
  {
      static int age, id;
      static double gpa;
      static String schoolName, name;
      static Scanner scan = new Scanner(System.in);
      public static void main(String[]args)
      {
      // gather general info
      /*        System.out.print("Please enter your name: ");
      name = scan.next();
      System.out.print("Please enter your age: ");
      age = scan.nextInt();
      System.out.print("Please enter your school's name: ");
      schoolName = scan.next();
      System.out.print("Please enter your ID: ");
      id = scan.nextInt();
      System.out.print("Please enter your current GPA: ");
      gpa = scan.nextDouble();*/
     
        int userChoice = 1;
        while (userChoice != 0)
        {
            menu();
            userChoice = scan.nextInt();
            menuSwitch(userChoice);
        }
     
      }
 
      public static void menuSwitch(int choice)
      {
        int num;
        switch(choice)
        {
            case 4:
              /* int gradYear;
                    System.out.print("Please enter your expected graduation year: ");
                    gradYear = scan.nextInt(); */
              MiddleSchool mStudent = new MiddleSchool();
              System.out.println(mStudent);
                   
              break;
            case 1:
                    /*int gradYear, numOfCreditsRemaining, satScore, apCredits;
                    System.out.print("Please enter your expected graduation year: ");
                    gradYear = scan.nextInt();
                    System.out.print("Please enter the number of credits remaining for you to graduate: ");
                    numOfCreditsRemaining = scan.nextInt();
                    System.out.print("Please enter your SAT score: ");
                    satScore = scan.nextInt();
                    System.out.print("Please enter your number of AP credits: ");
                    apCredits = scan.nextInt(); */
              HighSchool hsStudent = new HighSchool();
              System.out.println(hsStudent);
            case 2:
                    /*boolean time;
                    int pTime, status;
                    String major, minor;
                    System.out.print("Please enter your major: ");
                    major = scan.next();
                    System.out.print("Please enter your minor: ");
                    minor = scan.next();
                    System.out.print("Are you a full time or part time student? (1 - full time, 2 - part time) ");
                    pTime = scan.nextInt();
                    if (pTime == 1)
                            time = true;
                    else
                            time = false;
                    System.out.print("Are you an Undergratuate or Graduate? (1 - Graduate, 2 - undergraduate) ");
                    status = scan.nextInt();
                    if (status == 1)
                    {
                            System.out.print("What type of degree are you aquiring? ");
                            String degreeType = scan.next();
                            System.out.print("What was your score on the GRE? ");
                            int greScore = scan.nextInt();
                    }
                    else if (status == 2)
                    {
                            System.out.print("Please enter your exam 1 grade: ");
                            int examOne = scan.nextInt();
                            System.out.print("Please enter your exam 2 grade: ");
                            int examTwo = scan.nextInt();
                            // create for loop to gather grades and put them in an array
                            for (int i = 1; i <= 14; i++)
                            {
                                    System.out.print("Please enter Activity grade for Activity " + i +" : ");
                                    //array[i-1] = scan.nextInt();
                            }
                            for (int j = 1; j <= 14; j++)
                            {
                                    System.out.print("Please enter Exercise grade for Exercise "+j+" : ");
                                    //exerciseArray[j-1] = scan.nextInt();
                            }
                            for (int k = 1; k <= 14; i++)
                            {
                                    System.out.print("Please enter project grade for Project " + k +" : ");
                            //        arrayProjects[k-1] = scan.nextInt();
                            } */
              break;
                       
            default:
              System.out.println("Invalid choice");
        }
      }
 
      public static void menu()
      {
        System.out.print("Please enter your name: ");
        name = scan.next();
        System.out.print("Please enter your age: ");
        age = scan.nextInt();
        System.out.print("Please enter your school's name: ");
        schoolName = scan.next();
        System.out.print("Please enter your ID: ");
        id = scan.nextInt();
        System.out.print("Please enter your current GPA: ");
        gpa = scan.nextDouble();
        System.out.println("\tWhat type of stuent are you? ");
        System.out.println("*************");
        System.out.println("0: Middle School");
        System.out.println("1: High School");
        System.out.println("2: College");
        System.out.println("3: Quit");
        System.out.print("\nEnter your choice: ");
      }
 
  }

---

Because you've declared the variables locally to their methods. When you declare a variable like this:

Code:

---

class MyClass {
  void MyFunc() {
    int myVar = 5;
  }
}

---

myVar is only accessible within MyFunc(). If want myVar to be accessible to all methods in the class, you have to make it a property of the class:

Code:

---

class MyClass {
  int myVar = 5;

  void MyFunc() {
  }
}

---

That makes sense and it is working now. Thanks Twey