errors with scan.next()

Hi,
i have a program that takes in input from the user as a string. To get this i am using string = scan.next().

It works fine until i place a space in the string. I get an error. I dont think i have ever had this problem before but i will post the code jsut in case you need it.

Code:

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import java.util.Scanner;
    class Project8Driver
  {
      static int age, id;
      static double gpa;
      static String schoolName, name;
      static Scanner scan = new Scanner(System.in);
      static int userChoice = 1;
      static int counter = 0;
      static Student[] ListOfStudents = new Student[20];
      final static int LIMIT = 14; 
      static int ap, pTime;
      static String major, minor;
      static boolean time;
      public static void main(String[]args)
      {
        while (userChoice != 0)
        {
            menu();
            userChoice = scan.nextInt();
            menuSwitch(userChoice);
        }
     
      }
 
      public static void menuSwitch(int choice)
      {
        int num;
        switch(choice)
        {
            case 4:
                   
              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("Please enter your expected graduation year");
              int graduationYear = scan.nextInt();
             
              ListOfStudents[counter] = new MiddleSchool(name, age, schoolName, id, gpa, graduationYear);
              counter++;
             
                   
              break;
            case 3:
              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.print("What year do you plan to graduate? ");
              int 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();
             
              ListOfStudents[counter] = new HighSchool(name, age, schoolName, id, gpa, gradYear, credLeft, SAT, apCred);
              counter++;
                   
                   
              break;
            case 1:
              int[] activity = new int[LIMIT];
              int[] exercise = new int[LIMIT];
              int[] project = new int[LIMIT];                                     
              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.print("How many AP credits do you have? ");
              ap = scan.nextInt();
              System.out.print("What is your current major? ");
              major = scan.next();
              System.out.print("What is your current 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("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 +" : ");
                  activity[i-1] = scan.nextInt();
              }
              for (int j = 1; j <= 14; j++)
              {
                  System.out.print("Please enter Exercise grade for Exercise "+j+" : ");
                  exercise[j-1] = scan.nextInt();
              }
              for (int k = 1; k <= 14; k++)
              {
                  System.out.print("Please enter project grade for Project " + k +" : ");
                  project[k-1] = scan.nextInt();
              }
              System.out.print("What did you score on the1 final exam? ");
              int finalExam = scan.nextInt();
                           
              ListOfStudents[counter] = new Undergrad(name, age, schoolName, id, gpa, ap, major, minor, time, examOne, examTwo, activity, exercise, project, finalExam);
              counter++;
              break;
            case 2:
              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.print("What is your current major? ");
              String major = scan.next();
              System.out.print("What is your current minor? ");
              String minor = scan.next();
           
              System.out.print("Are you a full time or part time student? (1 - full time, 2 - part time) ");
              int pTime = scan.nextInt();
              if (pTime == 1)
                  time = true;
              else
                  time = false;
                           
              System.out.print("What did you score on your GRE? ");
              int gre = scan.nextInt();
              System.out.print("Are you getting your Ph.D. or Masters? ");
              String degree = scan.next();
                   
              ListOfStudents[counter] = new Graduate(name, age, schoolName, id, gpa, major, minor, time, gre, degree);
              counter++;
           
                   
              break;
            case 5:
              for(int i = 0; i < ListOfStudents.length; ++i)
                  if(ListOfStudents[i] != null)
                    System.out.println(ListOfStudents[i]);
              break;           
            default:
              for(int i = 0; i < ListOfStudents.length; ++i)
                  if(ListOfStudents[i] != null)
                    System.out.println(ListOfStudents[i]);
              System.out.println();
              System.out.println("Goodbye");
        }
      }
 
      public static void menu()
      {
        System.out.println("0: Quit");
        System.out.println("1: College - Undergraduate");
        System.out.println("2: College - Graduate");
        System.out.println("3: High School");
        System.out.println("4: Middle School");
        System.out.println("5: Print");
        System.out.print("\nEnter your choice: ");
             
      }
 
  }

---

here are the errors i am getting

Please enter your name: John Smith
Please enter your age: Exception in thread "main" java.util.InputMismatchException
at java.util.Scanner.throwFor(Scanner.java:840)
at java.util.Scanner.next(Scanner.java:1461)
at java.util.Scanner.nextInt(Scanner.java:2091)
at java.util.Scanner.nextInt(Scanner.java:2050)
at Project8Driver.menuSwitch(Project8Driver.java:55)
at Project8Driver.main(Project8Driver.java:21)
Any clue why it is doing this?