将用户数据存储在哈希图中

Question

我创建了一个将收集用户数据的表单，将其存储在hashmap中，然后在控制台中打印hashmap。我已经尝试了所有我能想到的方式，但它们没有工作。 这是我到目前为止尝试的。

//This is the class that will store user data in a hashmap
public class userRegistrationData {
    
    HashMap<String, ArrayList<String>> userData;
    
    public userRegistrationData() {
        RegistrationForm form = new RegistrationForm();
        userData = new HashMap<String,ArrayList<String>>();
        
        String id = String.valueOf(form.getUserIdField());
        String firstName = String.valueOf(form.getFirstNameTextField());
        String lastName = String.valueOf(form.getLastNameTextField());
        String phone = String.valueOf(form.getPhoneTextField());
        String city = String.valueOf(form.getCityTextField());
        String createPassword = String.valueOf(form.getCreatePasswordField());
        String confirmPassword = String.valueOf(form.getConfirmPasswordField());
        
        userData.put(id, new ArrayList<String>());
        userData.get(id).add(id);
        userData.get(id).add(firstName);
        userData.get(id).add(lastName);
        userData.get(id).add(lastName);
        userData.get(id).add(phone);
        userData.get(id).add(city);
        userData.get(id).add(createPassword);
        userData.get(id).add(confirmPassword);
    }
    private HashMap<String, ArrayList<String>> formData() {
        return userData;    
    }
    public HashMap<String, ArrayList<String>> getUserData() {
        return userData;
    }
    public void setUserData(HashMap<String, ArrayList<String>> userData) {
        this.userData = userData;
    }

    
}
//The action performed method which will listen to the submit button 
        

    @Override
    public void actionPerformed(ActionEvent e) {
        userRegistrationData data = new userRegistrationData();
        if(e.getSource().equals(submitBtn)) {
            if(data.getUserData().containsKey(getUserIdField())) {
                System.out.println(data.getUserData());
            }
        }
        
        
    }

Answer 1

您可以通过此简单代码打印它：

data.getUserData().entrySet().forEach(entry -> {
System.out.println(entry.getKey() + "\n" + 
Arrays.deepToString(entry.getValue().toArray()));
});

Answer 2

在 userRegistrationData 类中添加tostring函数：

public void toString(String id) {
        System.out.println(userData.get(id));
}

在您的 ActionPerformed 函数中，只需调用

data.toString(String.toValue(getUserIdField()));

而不是在ToString函数中打印对象，您也可以将其返回到Action Performed函数为字符串。