Java 查找和替换链表中的元素

我需要能够在链接列表中搜索特定的唯一元素（用户名、密码、电子邮件），找到这些元素后，我需要转到列表中的下一个节点，开始一系列语句，允许用户更改配置文件信息。由于某些原因，我的代码无法工作，我不知道如何修复它。任何帮助都会很好

GUI的外观如何

帐户类链接：

因此，用户填写所需信息，如果他们想更改配置文件信息，如“姓名”或“性别”，他们会更改信息，然后将其旁边的组合框设置为“是”，然后单击“保存设置”按钮

以下是链接列表的外观：

tobi
tobi123
tobi@hotmail.com
tobi
Mixed Breed
Male
1-2
Virginia
Walking
peppy
peppy123
peppy@hotmail.com
peppy
Chihuahua
Male
5-6
Virginia
Eating

private void jButtonP1ActionPerformed(java.awt.event.ActionEvent evt) {                                          
    //New Linked List created from file
    LinkedList<Account> account = new LinkedList<Account>();

    try
    {
        read(account, "doggydates.txt");
    } catch (Exception e)
    {
        System.err.println(e.toString());
    }
        display(account);

    //user information
    String username = jTextFieldP3.getText();
    String password = jPasswordFieldP1.getText();
    String email = jTextFieldP4.getText();
    String name = jTextFieldP1.getText();
    String breed = (String) jComboBoxP4.getSelectedItem();
    String gender = (String) jComboBoxP3.getSelectedItem();
    String age = (String) jComboBoxP1.getSelectedItem();
    String state = (String) jComboBoxP2.getSelectedItem();
    String hobby = jTextFieldP2.getText();
    //change combo boxes
    String passchange = (String) jComboBoxP13.getSelectedItem();
    String emailchange = (String) jComboBoxP14.getSelectedItem();
    String namechange = (String) jComboBoxP6.getSelectedItem();
    String breedchange = (String) jComboBoxP7.getSelectedItem();
    String genderchange = (String) jComboBoxP8.getSelectedItem();
    String agechange = (String) jComboBoxP9.getSelectedItem();
    String statechange = (String) jComboBoxP10.getSelectedItem();
    String hobbychange = (String) jComboBoxP11.getSelectedItem();

    //cancel combo box
    String accountcancel = (String) jComboBoxP5.getSelectedItem();

    if(username.equals("") || password.equals("") || email.equals("")) // If password and username is empty > Do this >>>
    {
        jButtonP1.setEnabled(false);
        jTextFieldP3.setText("");
        jPasswordFieldP1.setText("");
        jTextFieldP4.setText("");
        jButtonP1.setEnabled(true);
        this.setVisible(true);
    }
    else
    {
        ListIterator<Account> itr = account.listIterator();
        while (itr.hasNext()) 
        {
            Account item = itr.next();
            if(item.getUsername().equals(username) && item.getPassword().equals(password))
            {

                if(passchange.equals("Yes"))
                {    
                    for(Account acc : account){
                        if(acc.getUsername().equals(username)){
                            acc.goToNext();
                            acc.setDataAtCurrent(password);
                        }
                    }
                }

                if(emailchange.equals("Yes"))
                {    
                    for(Account acc : account){
                        if(acc.getUsername().equals(username)){
                            acc.goToNext();
                            acc.goToNext();
                            acc.setDataAtCurrent(email);
                        }
                    }
                }

                if(namechange.equals("Yes"))
                {    
                    for(Account acc : account){
                        if(acc.getUsername().equals(username)){
                            acc.goToNext();
                            acc.goToNext();
                            acc.goToNext();
                            acc.setDataAtCurrent(name);
                        }
                    }
                }

                if(breedchange.equals("Yes"))
                {    
                    for(Account acc : account){
                        if(acc.getUsername().equals(username)){
                            acc.goToNext();
                            acc.goToNext();
                            acc.goToNext();
                            acc.goToNext();
                            acc.setDataAtCurrent(breed);
                        }
                    }
                }

                if(genderchange.equals("Yes"))
                {    
                    for(Account acc : account){
                        if(acc.getUsername().equals(username)){
                            acc.goToNext();
                            acc.goToNext();
                            acc.goToNext();
                            acc.goToNext();
                            acc.goToNext();
                            acc.setDataAtCurrent(gender);
                        }
                    }
                }

                if(agechange.equals("Yes"))
                {    
                    for(Account acc : account){
                        if(acc.getUsername().equals(username)){
                            acc.goToNext();
                            acc.goToNext();
                            acc.goToNext();
                            acc.goToNext();
                            acc.goToNext();
                            acc.goToNext();
                            acc.setDataAtCurrent(age);
                        }
                    }
                }

                if(statechange.equals("Yes"))
                {    
                    for(Account acc : account){
                        if(acc.getUsername().equals(username)){
                            acc.goToNext();
                            acc.goToNext();
                            acc.goToNext();
                            acc.goToNext();
                            acc.goToNext();
                            acc.goToNext();
                            acc.goToNext();
                            acc.setDataAtCurrent(state);
                        }
                    }
                }

                if(hobbychange.equals("Yes"))
                {    
                    for(Account acc : account){
                        if(acc.getUsername().equals(username)){
                            acc.goToNext();
                            acc.goToNext();
                            acc.goToNext();
                            acc.goToNext();
                            acc.goToNext();
                            acc.goToNext();
                            acc.goToNext();
                            acc.goToNext();
                            acc.setDataAtCurrent(hobby);
                        }
                    }
                }                    

                if(accountcancel.equals("Yes"))
                {    
                    for(Account acc : account){
                        if(acc.getUsername().equals(username)){
                            acc.deleteCurrentNode();
                            acc.goToNext();
                            acc.deleteCurrentNode();
                            acc.goToNext();
                            acc.deleteCurrentNode();
                            acc.goToNext();
                            acc.deleteCurrentNode();
                            acc.goToNext();
                            acc.deleteCurrentNode();
                            acc.goToNext();
                            acc.deleteCurrentNode();
                            acc.goToNext();
                            acc.deleteCurrentNode();
                            acc.goToNext();
                            acc.deleteCurrentNode();
                            acc.goToNext();
                            acc.deleteCurrentNode();
                        }
                    }
                }  

            }
        }

        String file_name = "doggydates.txt";
        try {
                FileWriter fstream = new FileWriter(file_name);
                BufferedWriter out = new BufferedWriter(fstream);

                ListIterator itr2 = account.listIterator();
                while (itr2.hasNext()) {
                    Account element = (Account) itr2.next();
                    out.write("" + element);
                    out.newLine();
                }
                out.close();
                System.out.println("File created successfully.");

        } catch (Exception e) {
        }

    }
}                                         

public static void read(LinkedList<Account> account, String inputFileName) throws java.io.IOException{
    BufferedReader infile = new BufferedReader(new FileReader(inputFileName));
    while(infile.ready())
    {        
    String username = readLine(infile);
    String password = readLine(infile);
    String email = readLine(infile);
    String name = readLine(infile);
    String breed = readLine(infile);
    String gender = readLine(infile);
    String age = readLine(infile);
    String state = readLine(infile);
    String hobby = readLine(infile);

    Account a = new Account(username, password, email, name, breed, gender, age, state, hobby);
    account.add(a);
    a.showList();
    }
    infile.close();
}

这是我的按钮代码：

tobi
tobi123
tobi@hotmail.com
tobi
Mixed Breed
Male
1-2
Virginia
Walking
peppy
peppy123
peppy@hotmail.com
peppy
Chihuahua
Male
5-6
Virginia
Eating

private void jButtonP1ActionPerformed(java.awt.event.ActionEvent evt) {                                          
    //New Linked List created from file
    LinkedList<Account> account = new LinkedList<Account>();

    try
    {
        read(account, "doggydates.txt");
    } catch (Exception e)
    {
        System.err.println(e.toString());
    }
        display(account);

    //user information
    String username = jTextFieldP3.getText();
    String password = jPasswordFieldP1.getText();
    String email = jTextFieldP4.getText();
    String name = jTextFieldP1.getText();
    String breed = (String) jComboBoxP4.getSelectedItem();
    String gender = (String) jComboBoxP3.getSelectedItem();
    String age = (String) jComboBoxP1.getSelectedItem();
    String state = (String) jComboBoxP2.getSelectedItem();
    String hobby = jTextFieldP2.getText();
    //change combo boxes
    String passchange = (String) jComboBoxP13.getSelectedItem();
    String emailchange = (String) jComboBoxP14.getSelectedItem();
    String namechange = (String) jComboBoxP6.getSelectedItem();
    String breedchange = (String) jComboBoxP7.getSelectedItem();
    String genderchange = (String) jComboBoxP8.getSelectedItem();
    String agechange = (String) jComboBoxP9.getSelectedItem();
    String statechange = (String) jComboBoxP10.getSelectedItem();
    String hobbychange = (String) jComboBoxP11.getSelectedItem();

    //cancel combo box
    String accountcancel = (String) jComboBoxP5.getSelectedItem();

    if(username.equals("") || password.equals("") || email.equals("")) // If password and username is empty > Do this >>>
    {
        jButtonP1.setEnabled(false);
        jTextFieldP3.setText("");
        jPasswordFieldP1.setText("");
        jTextFieldP4.setText("");
        jButtonP1.setEnabled(true);
        this.setVisible(true);
    }
    else
    {
        ListIterator<Account> itr = account.listIterator();
        while (itr.hasNext()) 
        {
            Account item = itr.next();
            if(item.getUsername().equals(username) && item.getPassword().equals(password))
            {

                if(passchange.equals("Yes"))
                {    
                    for(Account acc : account){
                        if(acc.getUsername().equals(username)){
                            acc.goToNext();
                            acc.setDataAtCurrent(password);
                        }
                    }
                }

                if(emailchange.equals("Yes"))
                {    
                    for(Account acc : account){
                        if(acc.getUsername().equals(username)){
                            acc.goToNext();
                            acc.goToNext();
                            acc.setDataAtCurrent(email);
                        }
                    }
                }

                if(namechange.equals("Yes"))
                {    
                    for(Account acc : account){
                        if(acc.getUsername().equals(username)){
                            acc.goToNext();
                            acc.goToNext();
                            acc.goToNext();
                            acc.setDataAtCurrent(name);
                        }
                    }
                }

                if(breedchange.equals("Yes"))
                {    
                    for(Account acc : account){
                        if(acc.getUsername().equals(username)){
                            acc.goToNext();
                            acc.goToNext();
                            acc.goToNext();
                            acc.goToNext();
                            acc.setDataAtCurrent(breed);
                        }
                    }
                }

                if(genderchange.equals("Yes"))
                {    
                    for(Account acc : account){
                        if(acc.getUsername().equals(username)){
                            acc.goToNext();
                            acc.goToNext();
                            acc.goToNext();
                            acc.goToNext();
                            acc.goToNext();
                            acc.setDataAtCurrent(gender);
                        }
                    }
                }

                if(agechange.equals("Yes"))
                {    
                    for(Account acc : account){
                        if(acc.getUsername().equals(username)){
                            acc.goToNext();
                            acc.goToNext();
                            acc.goToNext();
                            acc.goToNext();
                            acc.goToNext();
                            acc.goToNext();
                            acc.setDataAtCurrent(age);
                        }
                    }
                }

                if(statechange.equals("Yes"))
                {    
                    for(Account acc : account){
                        if(acc.getUsername().equals(username)){
                            acc.goToNext();
                            acc.goToNext();
                            acc.goToNext();
                            acc.goToNext();
                            acc.goToNext();
                            acc.goToNext();
                            acc.goToNext();
                            acc.setDataAtCurrent(state);
                        }
                    }
                }

                if(hobbychange.equals("Yes"))
                {    
                    for(Account acc : account){
                        if(acc.getUsername().equals(username)){
                            acc.goToNext();
                            acc.goToNext();
                            acc.goToNext();
                            acc.goToNext();
                            acc.goToNext();
                            acc.goToNext();
                            acc.goToNext();
                            acc.goToNext();
                            acc.setDataAtCurrent(hobby);
                        }
                    }
                }                    

                if(accountcancel.equals("Yes"))
                {    
                    for(Account acc : account){
                        if(acc.getUsername().equals(username)){
                            acc.deleteCurrentNode();
                            acc.goToNext();
                            acc.deleteCurrentNode();
                            acc.goToNext();
                            acc.deleteCurrentNode();
                            acc.goToNext();
                            acc.deleteCurrentNode();
                            acc.goToNext();
                            acc.deleteCurrentNode();
                            acc.goToNext();
                            acc.deleteCurrentNode();
                            acc.goToNext();
                            acc.deleteCurrentNode();
                            acc.goToNext();
                            acc.deleteCurrentNode();
                            acc.goToNext();
                            acc.deleteCurrentNode();
                        }
                    }
                }  

            }
        }

        String file_name = "doggydates.txt";
        try {
                FileWriter fstream = new FileWriter(file_name);
                BufferedWriter out = new BufferedWriter(fstream);

                ListIterator itr2 = account.listIterator();
                while (itr2.hasNext()) {
                    Account element = (Account) itr2.next();
                    out.write("" + element);
                    out.newLine();
                }
                out.close();
                System.out.println("File created successfully.");

        } catch (Exception e) {
        }

    }
}                                         

public static void read(LinkedList<Account> account, String inputFileName) throws java.io.IOException{
    BufferedReader infile = new BufferedReader(new FileReader(inputFileName));
    while(infile.ready())
    {        
    String username = readLine(infile);
    String password = readLine(infile);
    String email = readLine(infile);
    String name = readLine(infile);
    String breed = readLine(infile);
    String gender = readLine(infile);
    String age = readLine(infile);
    String state = readLine(infile);
    String hobby = readLine(infile);

    Account a = new Account(username, password, email, name, breed, gender, age, state, hobby);
    account.add(a);
    a.showList();
    }
    infile.close();
}

private void jButtonP1ActionPerformed（java.awt.event.ActionEvent evt）{
//从文件创建的新链接列表
LinkedList帐户=新建LinkedList（）；
尝试
{
读（账户，“doggydates.txt”）；
}捕获（例外e）
{
System.err.println（例如toString（））；
}
显示（账户）；
//用户信息
字符串username=jTextFieldP3.getText（）；
字符串密码=jPasswordFieldP1.getText（）；
字符串email=jTextFieldP4.getText（）；
String name=jTextFieldP1.getText（）；
字符串种类=（字符串）jcomboxp4.getSelectedItem（）；
字符串性别=（字符串）jcomboxp3.getSelectedItem（）；
字符串年龄=（字符串）jComboxP1.getSelectedItem（）；
字符串状态=（字符串）jcomboxp2.getSelectedItem（）；
字符串hobby=jTextFieldP2.getText（）；
//更改组合框
字符串passchange=（字符串）jcomboxp13.getSelectedItem（）；
字符串emailchange=（字符串）jcomboxp14.getSelectedItem（）；
字符串名称更改=（字符串）jcomboxp6.getSelectedItem（）；
String breedchange=（String）jcomboxP7.getSelectedItem（）；
字符串genderchange=（字符串）jcomboxp8.getSelectedItem（）；
String agechange=（String）jComboxP9.getSelectedItem（）；
String statechange=（String）jComboxP10.getSelectedItem（）；
字符串hobbychange=（字符串）jcomboxp11.getSelectedItem（）；
//取消组合框
字符串accountcancel=（字符串）jcomboxp5.getSelectedItem（）；
if（username.equals（“”）| password.equals（“”）| email.equals（“”）//如果密码和用户名为空>执行此操作>>
{
jButtonP1.setEnabled（false）；
jTextFieldP3.setText（“”）；
jPasswordFieldP1.setText（“”）；
jTextFieldP4.setText（“”）；
jButtonP1.setEnabled（true）；
此.setVisible（true）；
}
其他的
{
ListIterator itr=account.ListIterator（）；
while（itr.hasNext（））
{
账户项目=itr.next（）；
if（item.getUsername（）.equals（用户名）和&item.getPassword（）.equals（密码））
{
如果（passchange.equals（“是”））
{    
会计科目（会计科目：会计科目）{
如果（根据getUsername（）等于（用户名））{
acc.goToNext（）；
acc.setDataAtCurrent（密码）；
}
}
}
如果（emailchange.equals（“是”））
{    
会计科目（会计科目：会计科目）{
如果（根据getUsername（）等于（用户名））{
acc.goToNext（）；
acc.goToNext（）；
acc.setDataAtCurrent（电子邮件）；
}
}
}
如果（名称更改等于（“是”））
{    
会计科目（会计科目：会计科目）{
如果（根据getUsername（）等于（用户名））{
acc.goToNext（）；
acc.goToNext（）；
acc.goToNext（）；
acc.setDataAtCurrent（名称）；
}
}
}
如果（breedchange.equals（“是”））
{    
会计科目（会计科目：会计科目）{
如果（根据getUsername（）等于（用户名））{
acc.goToNext（）；
acc.goToNext（）；
acc.goToNext（）；
acc.goToNext（）；
acc.setDataAtCurrent（品种）；
}
}
}
如果（性别变化等于（“是”））
{    
会计科目（会计科目：会计科目）{
如果（根据getUsername（）等于（用户名））{
acc.goToNext（）；
acc.goToNext（）；
acc.goToNext（）；
acc.goToNext（）；
acc.goToNext（）；
acc.setDataAtCurrent（性别）；
}
}
}
如果（年龄变化等于（“是”））
{    
会计科目（会计科目：会计科目）{
如果（根据getUsername（）等于（用户名））{
acc.goToNext（）；
acc.goToNext（）；
acc.goToNext（）；
acc.goToNext（）；
acc.goToNext（）；
acc.goToNext（）；
acc.setDataAtCurrent（年龄）；
}
}
}
如果（statechange.equals（“是”））
{    
会计科目（会计科目：会计科目）{
如果（根据getUsername（）等于（用户名））{
acc.goToNext（）；
acc.goToNext（）；
acc.goToNext（）；
{
   {tobi, tobi123, tobi@hotmail.com, tobi, Mixed Breed, Male, 1-2, Virginia, Walking},
   {peppy, peppy123, peppy@hotmail.com, peppy, Chihuahua, Male, 5-6, Virginia, Eating}
}