ActionListener中的java ArrayList不工作

Question

我制作了一个名为DoctorsCare的java程序，患者可以在其中预约医生。因此，在预约小组中，我包括了患者id、姓名、性别、出生日期、地址和简要的患者病史

所有这些字符串值将在数组列表中获取，并在填写预约表单并单击提交按钮后最终返回到新选项卡（医生选项卡）。我编写的数组列表代码有一些问题，但我可以运行该程序

我只需要知道我在哪里犯了错误，以及如何将数组列表值返回到“医生”选项卡

import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.Normalizer.Form;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import javax.swing.*;

public class NewPage extends JFrame implements ActionListener{

    JFrame frame1= new JFrame();
    JTextField id;
    JLabel label = new JLabel("Patient ID:");
    JLabel label2 = new JLabel("Name:");
    JLabel label3 = new JLabel("Gender:");
    JLabel label4 = new JLabel("Date of Birth:");
    JLabel label5 = new JLabel("Address:");
    JLabel label7 = new JLabel("Phone:");
    JLabel label6= new JLabel("brief patient history:");
    JPanel panel1 = new JPanel();
    JTextArea phistry = new JTextArea(11,31);
    JTextField text1 = new JTextField(20);
    JTextField text2 = new JTextField(20);
    JTextField text3 = new JTextField(20);
    JTextField text4 = new JTextField(20);
    JTextField text5 = new JTextField(20);
    JTextField text6 = new JTextField();
    JTextField text7 = new JTextField(20);
    JButton button = new JButton("SUBMIT");

    NewPage()
    {
        frame1.setTitle("Booking Appointment");      
        frame1.setVisible(true);
        frame1.setSize(330,470);
        frame1.add(panel1);
        panel1.add(label);

        panel1.add(text1);
        panel1.add(label2);
        panel1.add(text2);
        panel1.add(label3);
        panel1.add(text3);
        panel1.add(label4);
        panel1.add(text4);
        panel1.add(label5);
        panel1.add(text5);
        panel1.add(label7);
        panel1.add(text7);
        panel1.add(label6);
        panel1.add(phistry);
        panel1.add(button);
        button.setPreferredSize(new Dimension(160,40));
        button.addActionListener(this);             
    }



    \\the button code
    public void actionPerformed(ActionEvent e) {     

        List<List<String>> model = new ArrayList<List<String>>(); 

        text1.selectAll(); \\selects the input from user
        text2.selectAll();
        text3.selectAll();
        text4.selectAll();
        text5.selectAll();
        text6.selectAll();
        String ID = text1.getSelectedText(); \\initializes ID
        String PName = text2.getSelectedText();
        String Gender = text3.getSelectedText();
        String DoB = text4.getSelectedText();
        String Address = text5.getSelectedText();
        //String phone = text7.getSelectedText();
        String phistry = text6.getSelectedText();

        //String phistry = text6.getSelectedText();

        List<String> line = Arrays.asList(new String[]{ID, PName, Gender, DoB, Address, phistry});
        model.add(line);

        StringBuilder sb = new StringBuilder();
        sb.append("ID\tFirst\tLast\tCourse\tYear\n");
        for(List<String> input : model) {
            for (String item : input) {
                sb.append(item);
                if (input.indexOf(item) == input.size()-1) {
                    sb.append("\n");
                } else {
                    sb.append("\t");
                }
            }
        }
    }
}

Answer 1

首先，你的List包含模型信息，但你还没有在actionPerformed方法的文本区域中设置它

this.phistry.setText(sb.toString());

假设在下面这样一个单独的类中有“医生”选项卡（否则可以直接在NewFrame中设置模型

class DoctorsPanel extends JPanel {

    private List<List<String>> model;
    JTextArea history;

    public DoctorsPanel() {
        model = new LinkedList<>();
        history = new JTextArea(11, 31);
        setLayout(new GridLayout(1, 1));
        add(history);
    }

    public void setModel(List<List<String>> model) {
        this.model = model;
        setHistory();
    }

    private void setHistory() {
        this.history.setText(getModelData());
    }

    private String getModelData() {
        StringBuilder sb = new StringBuilder();
        sb.append("ID\tFirst\tLast\tCourse\tYear\n");
        for (List<String> input : model) {
            for (String item : input) {
                sb.append(item);
                if (input.indexOf(item) == input.size() - 1) {
                    sb.append("\n");
                } else {
                    sb.append("\t");
                }
            }
        }
        return sb.toString();
    }

}

你可以在^{中使用如下选项卡式窗格

 JTabbedPane jTab = new JTabbedPane();
 panel1 = new JPanel();
 panel2=new DoctorsPanel();
 jTab.add("Book", panel1);
 jTab.add("Doctors", panel2);
 frame1.add(jTab);

然后你可以在预约的时候设定
即在tab1组件上执行操作时

public void actionPerformed(ActionEvent e) {     

        List<List<String>> model = new ArrayList<List<String>>(); 

        String ID = text1.getText();
        String PName = text2.getText();
        String Gender = text3.getText();
        String DoB = text4.getText();
        String Address = text5.getText();
        String phistry = text6.getText();

        List<String> line = Arrays.asList(new String[]{ID, PName, Gender, DoB, Address, phistry});
        model.add(line);

        StringBuilder sb = new StringBuilder();
        sb.append("ID\tFirst\tLast\tCourse\tYear\n");
        for(List<String> input : model) {
            for (String item : input) {
                sb.append(item);
                if (input.indexOf(item) == input.size()-1) {
                    sb.append("\n");
                } else {
                    sb.append("\t");
                }
            }
        }
        this.phistry.setText(sb.toString());//sets the text in tab1
        panel2.setModel(model);//sets the model in Doctors panel
    }

但是我建议将变量modelList作为成员而不是局部变量保存在类NewFrame中，以保存之前添加的信息