Java - 为什么我的Switch语句不能正常工作？

Question

首先我要说的是，我知道我的代码可以在函数上编写得更多，而且我知道我的变量比我需要的更多。这是针对入门Java类的学校作业，我正在尝试按照T的说明进行操作。

import java.util.Scanner;

public class UniversityTest {

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        String personType;
        int userInput = 0;
        Person[] all_people = new Person[100];
        int count = 0;
        String name;
        String idNumber;
        float GPA;
        int admissionYear;
        int expGrad;
        int currYear;
        String position;
        int hireYear;
        float salary;
        String advisorName;
        String researchArea;
        int hours;
        float rate;

        while (count < 100){
            System.out.println("Please enter the category of person: ");
            personType = input.nextLine().toLowerCase();
            switch (personType){
            //if (personType.equals("student")){
            case "student":
                System.out.println("Enter the student's name: ");
                name = input.nextLine();
                System.out.println("Enter the student's ID number: ");
                idNumber = input.nextLine();
                System.out.println("Enter the student's GPA: ");
                GPA = Float.parseFloat(input.nextLine());
                System.out.println("Enter the student's admission year: ");
                admissionYear = Integer.parseInt(input.nextLine());
                System.out.println("Enter the student's expected year of graduation: ");
                expGrad = Integer.parseInt(input.nextLine());
                System.out.println("Enter the current year: ");
                currYear = Integer.parseInt(input.nextLine());
                Student new_student = new Student("Student", name, idNumber, GPA, admissionYear, 
                        expGrad, currYear);
                all_people[count] = new_student;
                count++;
                break;
            //} 
            //else if (personType.equals("grad student")){
            case "grad student":    
                System.out.println("Enter the grad student's name: ");
                name = input.nextLine();
                System.out.println("Enter the grad student's ID number: ");
                idNumber = input.nextLine();
                System.out.println("Enter the grad student's GPA: ");
                GPA = Float.parseFloat(input.nextLine());
                System.out.println("Enter the grad student's admission year: ");
                admissionYear = Integer.parseInt(input.nextLine());
                System.out.println("Enter the grad student's expected year of graduation: ");
                expGrad = Integer.parseInt(input.nextLine());
                System.out.println("Enter the grad student's position: ");
                position = input.nextLine();
                System.out.println("Enter the name of the grad student's advisor: ");
                advisorName = input.nextLine();
                System.out.println("Enter the grad student's area of research: ");
                researchArea = input.nextLine();
                System.out.println("Enter how many hours a week this grad student works: ");
                hours = Integer.parseInt(input.nextLine());
                System.out.println("Enter this grad student's hourly pay rate: ");
                rate = Float.parseFloat(input.nextLine());
                System.out.println("Enter the current year: ");
                currYear = Integer.parseInt(input.nextLine());
                GradStudent new_grad_student = new GradStudent("Grad Student", name, idNumber, GPA,
                        admissionYear, expGrad, currYear, position, advisorName, researchArea, hours, rate);
                all_people[count] = new_grad_student;
                count++;
                break;
            //}
            //else if (personType.equals("faculty")){
            case "faculty": 
                System.out.println("Enter the faculty member's name: ");
                name = input.nextLine();
                System.out.println("Enter the faculty member's ID number: ");
                idNumber = input.nextLine();
                System.out.println("Enter the faculty member's job: ");
                position = input.nextLine();
                System.out.println("Enter the year this faculty member was hired: ");
                hireYear = Integer.parseInt(input.nextLine());
                System.out.println("Enter this faculty member's annual salary: ");
                salary = Float.parseFloat(input.nextLine());
                Faculty new_faculty = new Faculty("Faculty", name, idNumber, position, hireYear, salary);
                all_people[count] = new_faculty;
                count++;
                break;
            //}
            //else {
            default:    
                System.out.println("Enter this person's name: ");
                name = input.nextLine();
                System.out.println("Enter this person's ID number: ");
                idNumber = input.nextLine();
                Person new_person = new Person(personType, name, idNumber);
                all_people[count] = new_person;
                count++;
                break;
            //}
            }//END OF SWITCH

            System.out.println("Press 1 to enter another user, or 0 to end.");
            userInput = input.nextInt();
            if (userInput == 0) {break;}
        }//END OF WHILE LOOP

        for(int i = 0; i < count; i++){
            System.out.println(all_people[i].toString());
        }
    }//END OF MAIN

 }

它适用于第一次运行，但当它返回到while循环的顶部时，它打印出“请输入人物的类别：”，然后直接跳到默认语句“请输入此人的姓名：“没有让用户有机会再次输入此类型的人。我最初用if语句（编辑出来）做了这个，但尝试将它切换到switch语句，以防万一可以解决它。我显然还有其他三个班级，但这可能是浪费时间，因为我很确定这个课程存在问题。