Netbeans java程序重复一个文本文件而不是注销选项

我正在为一个java初学者班做我的项目。该程序是针对动物园的身份验证程序。我的程序运行良好，除了一件事。用户名和密码经过身份验证后，应该显示一个文件，上面写着“hello zoo keeper…”，然后要求用户注销。我的问题是，在它显示正确的文本文件后，它不会要求注销。它将文本文件再重复两次

例如：

喂，动物园管理员

作为动物园管理员，您可以访问所有动物的信息和 他们的日常监控日志。这可以让你追踪它们的进食情况 习惯、栖息地条件和一般福利

喂，动物园管理员

作为动物园管理员，您可以访问所有动物的信息和 他们的日常监控日志。这可以让你追踪它们的进食情况 习惯、栖息地条件和一般福利

喂，动物园管理员

作为动物园管理员，您可以访问所有动物的信息和 他们的日常监控日志。这可以让你追踪它们的进食情况 习惯、栖息地条件和一般福利

生成成功（总时间：15秒）

我会把我的代码放在下面，并对我能得到的任何帮助表示感谢

     package AuthenticationSystem;

     //import necessary java tools
     import java.io.FileInputStream;
     import java.io.BufferedReader;
     import java.io.InputStreamReader;
     import java.security.MessageDigest;
     import java.util.Scanner;
     import javax.swing.JOptionPane;

     public class Authenticationsystem {

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

    Scanner scnr = new Scanner(System.in);

    // fileinput reading txt iles
    FileInputStream fis = null;
    InputStreamReader isr = null;
    BufferedReader br = null;
    String txtline = "";

    //credentials elements
    final int NUM_ELEMENTS = 6;
    String[] storedUsername = new String[NUM_ELEMENTS];
    String[] role = new String[NUM_ELEMENTS];
    String[] hashPassword = new String[NUM_ELEMENTS];
    String username = "";
    String password = "";
    String hash = "";

    int i = 0;
    int j = 0;
    int user = 0;
    boolean verified = false;

    // user / pw array
    storedUsername[i] = "griffin.keyes";
    hashPassword[i] = "108de81c31bf9c622f76876b74e9285f";
    ++i;
    storedUsername[i] = "rosario.dawson";
    hashPassword[i] = "3e34baa4ee2ff767af8c120a496742b5";
    ++i;
    storedUsername[i] = "bernie.gorilla";
    hashPassword[i] = "a584efafa8f9ea7fe5cf18442f32b07b";
    ++i;
    storedUsername[i] = "donald.monkey";
    hashPassword[i] = "17b1b7d8a706696ed220bc414f729ad3";
    ++i;
    storedUsername[i] = "jerome.grizzlybear";
    hashPassword[i] = "3adea92111e6307f8f2aae4721e77900";
    ++i;
    storedUsername[i] = "bruce.grizzlybear";
    hashPassword[i] = "0d107d09f5bbe40cade3de5c71e9e9b7";
    ++i;

    //dialog box entry
    JOptionPane.showMessageDialog(null, "All entries are case sensitive.\n"
            + "Enter \"quit\" at any time to exit.", "Authentication System", JOptionPane.PLAIN_MESSAGE);

    // enter username / password
    username = (String) JOptionPane.showInputDialog(null, "Enter username: ", "Authentication System", JOptionPane.PLAIN_MESSAGE);
    if (username.equals("quit")) {
        JOptionPane.showMessageDialog(null, "You have chosen to exit. Goodbye.", "Authentication System", JOptionPane.WARNING_MESSAGE);
        return;
    }
    password = (String) JOptionPane.showInputDialog(null, "Enter password: ", "Authentication System", JOptionPane.PLAIN_MESSAGE);
    if (password.equals("quit")) {
        JOptionPane.showMessageDialog(null, "You have chosen to exit. Goodbye.", "Authentication System", JOptionPane.WARNING_MESSAGE);
        return;
    }

    //exit after three checks
    for (i = 0; i < 3; ++i) {

        // check user credentials 
        for (j = 0; j < NUM_ELEMENTS; ++j) {
            if (username.equals(storedUsername[j])) {
                String original = password;  // md5digest
                MessageDigest md = MessageDigest.getInstance("MD5");
                md.update(original.getBytes());
                byte[] digest = md.digest();
                StringBuilder sb = new StringBuilder();
                for (byte b : digest) {
                    sb.append(String.format("%02x", b & 0xff));
                }

                verified = true;
                user = j;
                hash = sb.toString();
            }
        }
        //if wrong entry, re-enter
        if (!hash.equals(hashPassword[user])) {
            verified = false;
            if (i < 2) {
                JOptionPane.showMessageDialog(null, "Invalid user credentials. " + (2 - i)
                        + " attempt(s) remaining.", "Authentication System", JOptionPane.PLAIN_MESSAGE);
                username = (String) JOptionPane.showInputDialog(null, "Enter username: ", "Authentication System",
                        JOptionPane.PLAIN_MESSAGE);
                if (username.equals("quit")) {
                    JOptionPane.showMessageDialog(null, "You have chosen to exit. Goodbye.", "Authentication System",
                            JOptionPane.WARNING_MESSAGE);
                    break;
                }
                password = (String) JOptionPane.showInputDialog(null, "Enter password: ", "Authentication System",
                        JOptionPane.PLAIN_MESSAGE);
                if (password.equals("quit")) {
                    JOptionPane.showMessageDialog(null, "You have chosen to exit. Goodbye.", "Authentication System",
                            JOptionPane.WARNING_MESSAGE);
                    break;
                }
            }
            //closes program if tries exceed 3
            if ((!verified) && (i == 2)) {
                JOptionPane.showMessageDialog(null, "Could not verify credentials. Goodbye.", "Authentication System",
                        JOptionPane.ERROR_MESSAGE);
                break;
            }
        } // if user credentials work
        else {

            //get input from txt files
            // user if zookeeper
            if (username.equals(storedUsername[0]) || username.equals(storedUsername[3])) {
                fis = new FileInputStream("src\\AuthenticationSystem\\zookeeper.txt");
                isr = new InputStreamReader(fis);
                br = new BufferedReader(isr);
                while ((txtline = br.readLine()) != null) {
                    System.out.println(txtline);

                }
            } //user is a veternarian
            else if (username.equals(storedUsername[2]) || username.equals(storedUsername[4])) {
                fis = new FileInputStream("src\\AuthenticationSystem\\veterinarian.txt");
                isr = new InputStreamReader(fis);
                br = new BufferedReader(isr);
                while ((txtline = br.readLine()) != null) {
                    System.out.println(txtline);
                }
            } //user is an admin
            else {
                fis = new FileInputStream("src\\AuthenticationSystem\\admin.txt");
                isr = new InputStreamReader(fis);
                br = new BufferedReader(isr);
                while ((txtline = br.readLine()) != null) {
                    System.out.println(txtline);

                }
            }
            System.out.println();
            class logout {

                public void logout(String original) throws Exception {
                    int i = 0;
                    Scanner input = new Scanner(System.in);
                    while (i == 0) {
                        System.out.println("To log out please press 1 then the enter key");
                        int result = input.nextInt();
                        if (result == 1) {
                            System.out.println("You have logged out.  Have a great day!");
                            i = 1;
                        } else {
                            System.out.println("You are still logged in.");
                        }
                    }
                }
            }

        }
    }
}

包认证系统；
//导入必要的java工具
导入java.io.FileInputStream；
导入java.io.BufferedReader；
导入java.io.InputStreamReader；
导入java.security.MessageDigest；
导入java.util.Scanner；
导入javax.swing.JOptionPane；
公共类认证系统{
公共静态void main（字符串[]args）引发异常{
扫描仪scnr=新扫描仪（System.in）；
//文件输入读取txt文件
FileInputStream fis=null；
InputStreamReader isr=null；
BufferedReader br=null；
字符串txtline=“”；
//凭证元素
最终int NUM_元素=6；
String[]storedUsername=新字符串[NUM_元素]；
String[]角色=新字符串[NUM_元素]；
String[]hashPassword=新字符串[NUM_元素]；
字符串username=“”；
字符串密码=”；
字符串哈希=”；
int i=0；
int j=0；
int user=0；
布尔验证=假；
//用户/pw阵列
storedUsername[i]=“格里芬·凯斯”；
hashPassword[i]=“108DE81C31BF9C622F7687B74E9285F”；
++一,；
storedUsername[i]=“rosario.dawson”；
hashPassword[i]=“3e34baa4ee2ff767af8c120a496742b5”；
++一,；
storedUsername[i]=“伯尼大猩猩”；
hashPassword[i]=“a584efafa8f9ea7fe5cf18442f32b07b”；
++一,；
storedUsername[i]=“donald.monkey”；
hashPassword[i]=“17B1B7D8A7066966ED220BC414F729AD3”；
++一,；
storedUsername[i]=“jerome.grizzlybear”；
hashPassword[i]=“3adea92111e6307f8f2aae4721e77900”；
++一,；
storedUsername[i]=“bruce.grizzlybear”；
hashPassword[i]=“0d107d09f5bbe40cade3de5c71e9e9b7”；
++一,；
//对话框条目
JOptionPane.showMessageDialog（null，“所有条目都区分大小写。\n”
+“随时输入\“退出\”退出。”，“身份验证系统”，JOptionPane.PLAIN_消息）；
//输入用户名/密码
用户名=（字符串）JOptionPane.showInputDialog（null，“输入用户名：”，“身份验证系统”，JOptionPane.PLAIN\u消息）；
if（username.equals（“退出”））{
showMessageDialog（null，“您已选择退出。再见”，“身份验证系统”，JOptionPane.WARNING_消息）；
返回；
}
password=（字符串）JOptionPane.showInputDialog（null，“输入密码：”，“身份验证系统”，JOptionPane.PLAIN_消息）；
if（password.equals（“退出”））{
showMessageDialog（null，“您已选择退出。再见”，“身份验证系统”，JOptionPane.WARNING_消息）；
返回；
}
//三次检查后退出
对于（i=0；i<3；++i）{
//检查用户凭据
对于（j=0；j// user / pw array


storedUsername[i] = "griffin.keyes";
hashPassword[i] = "108de81c31bf9c622f76876b74e9285f";
++i;
storedUsername[i] = "rosario.dawson";
hashPassword[i] = "3e34baa4ee2ff767af8c120a496742b5";
++i;
storedUsername[i] = "bernie.gorilla";
hashPassword[i] = "a584efafa8f9ea7fe5cf18442f32b07b";
++i;
storedUsername[i] = "donald.monkey";
hashPassword[i] = "17b1b7d8a706696ed220bc414f729ad3";
++i;
storedUsername[i] = "jerome.grizzlybear";
hashPassword[i] = "3adea92111e6307f8f2aae4721e77900";
++i;
storedUsername[i] = "bruce.grizzlybear";
hashPassword[i] = "0d107d09f5bbe40cade3de5c71e9e9b7";
++i;

//exit after three checks]
for (i = 0; i < 3; ++i) {

    // check user credentials 
    for (j = 0; j < NUM_ELEMENTS; ++j) {
        if (username.equals(storedUsername[j])) {