java - 用户输入 GUI 的值未保存？

Question

下面是我正在编写的代码。基本上我需要一个框来打开并让用户在相应的文本字段中输入数据。一切都运转良好。当我从 actionPerformed 方法打印时，所有内容都正确输出，但是当我从 main 调用 gui.displayPersonInfo 方法时，它将所有值显示为 null。它在盒子打开之前首先执行 displayPersonInfo 方法，即使我在之后调用该方法。有人知道我的代码有什么问题吗？ (输出如下)

package userInput;

import javax.swing.JFrame;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;

public class Person extends JFrame{

String Name; 
String Address;
String PhoneNumHome;
String PhoneNumWork;
String email;

JLabel label, label2;
JTextField tf1, tf2, tf3, tf4, tf5, tf6, tf7, tf8;
JButton button;

public Person(){
    setLayout(new FlowLayout());
    label = new JLabel("Enter your name");
    add(label);
    tf1 = new JTextField(10);
    add(tf1);

    label = new JLabel("Enter your Address (street number + street name)");
    add(label);
    tf2 = new JTextField(10);
    add(tf2);

    label = new JLabel("Enter your city");
    add(label);
    tf3 = new JTextField(10);
    add(tf3);

    label = new JLabel("Enter your province");
    add(label);
    tf4 = new JTextField(10);
    add(tf4);

    label = new JLabel("Enter your postal code");
    add(label);
    tf5 = new JTextField(10);
    add(tf5);

     label = new JLabel("Enter your home phone number (306-xxx-xxx)");
    add(label);
    tf6 = new JTextField(10);
    add(tf6);

     label = new JLabel("Enter your work phone number (306-xxx-xxx)");
    add(label);
    tf7 = new JTextField(10);
    add(tf7);

     label = new JLabel("Enter your email (user@emailservice.xxx");
    add(label);
    tf8 = new JTextField(10);
    add(tf8);

    button = new JButton("Next");
    add(button);

    event e = new event();
    button.addActionListener(e);
}

public class event implements ActionListener{
    public void actionPerformed(ActionEvent e){
        String address1, pnum, wnum, a;
        try{
            String word = tf1.getText();
            Name = word;
            System.out.println(Name);
            Address = tf2.getText();
            Address = Address + " " + tf3.getText();
            Address = Address + " " + tf4.getText();
            Address = Address + " " + tf5.getText();
            address1 = Address;
            System.out.println(Address);
            PhoneNumHome = tf6.getText();
            pnum = PhoneNumHome;
            PhoneNumWork = tf7.getText();
            wnum = PhoneNumWork;
            email = tf8.getText();
            a = email;
            System.out.println(PhoneNumHome);
            System.out.println(PhoneNumWork);
            System.out.println(email);

            saveInfo(word, address1, pnum, wnum, a);
            displayPersonInfo();
            System.exit(0);

        }catch(Exception ex){}
    }
}

public void displayPersonInfo(){
    System.out.println("Name: " + Name);
    System.out.println("Address: " + Address);
    System.out.println("Home Phone Number: " + PhoneNumHome);
    System.out.println("Work Phone Number: " + PhoneNumWork);
    System.out.println("Email: " + email);
}

public void saveInfo(String name, String address, String Hphone, String Wphone, String Email){
    Name = name;
    Address = address;
    PhoneNumHome = Hphone;
    PhoneNumWork = Wphone;
    email = Email;
}

public static void main(String[] args) {
    Person gui = new Person();

    gui.displayPersonInfo();
    gui.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    gui.setTitle("Enter Information");
    gui.setSize(350,330);
    gui.setLocation(500,250);
    gui.setVisible(true);

}

}

这里是输出:(它的作用就好像 displayPersonInfo 首先发生)
运行:
姓名:空
地址:空
家庭电话号码: null
工作电话号码: null
邮箱:空
名称(现在它从 actionPerformed 中打印它)一个地址一个城市一个省一个邮政编码
一个数字
另一个号码
一封电子邮件
姓名:一个名字
地址:一个地址一个城市一个省一个邮政编码
家庭电话号码:一个号码
工作电话号码:另一个号码
电子邮件:一封电子邮件
构建成功(总时间:20 秒)

Answer 1

您的 saveInfo 函数似乎是多余的，因为您在调用它之前已经设置了每个值，但我不知道为什么 saveInfo 将这些值清空。尝试在 saveInfo 之前调用 displayPersonInfo 并看看会发生什么。