存储多个文本字段输入的java

Question

我一直在做一个项目，试图通过GUI上的用户输入将输入存储在阵列中。 现在的问题是我找不到类似于Scanner方法的“input.next”的东西

谢谢你的帮助

下面是从我的Main中执行的GUI类的样子

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


public class GUI implements ActionListener {

    //Private the variables to make them accessible to other methods
    private static JLabel orderLabel;
    private static JTextField orderText;
    private static JButton confirmButton;

    public  GUI(){
        JFrame window = new JFrame();

        JPanel panel = new JPanel();

        window.setSize(350, 200);
        window.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        window.add(panel);
        window.setTitle("Place your order");

        panel.setLayout(null);


        //Creating label for the order text field:
        orderLabel = new JLabel("Your order:"); //Creates the label memory
        orderLabel.setBounds(10, 20, 80, 25); //Creates bounds for the label
        panel.add(orderLabel); //Adds the label to the window


        //Creating the text field
        orderText = new JTextField(); //Creates text field memory
        orderText.setBounds(100, 22, 165, 25); //Creates text field bounds
        orderText.addActionListener(this);
        panel.add(orderText); //Adds the text field to the window

        //Creating the button to confirm order
        confirmButton = new JButton("Confirm order");
        confirmButton.setBounds(90, 100, 170, 30);
        confirmButton.addActionListener(this);//Links the button to the action listener method inside this file
        panel.add(confirmButton);



        window.setVisible(true);

    }
    
    @Override
    public void actionPerformed(ActionEvent e) {
        List<String> list = new ArrayList<String>();
        String input = orderText.getText();
        String temp = input.next();



    }
}

Answer 1

如果要对JTextField的内容使用Scanner#next()方法，只需使用Scanner对象即可，例如：

List<String> list = new ArrayList<>();
Scanner input = new Scanner(orderText.getText());
while (input.hasNext()) {
    list.add(input.next());
}

当然，您希望JTextField中提供的所有内容都用空格分隔，例如：

Bread Milk Sugar Coffee

这将显示为如下列表：

Bread
Milk
Sugar
Coffee

当然，这可能不够好，因为很多必填项都包含多个单词，例如：

French Fries Whole Wheat Bread 2% Milk

这将显示为如下列表：

French
Fries
Whole
Wheat
Bread
2%
Milk

不是真正想要的。在这种特殊情况下，可以使用Scanner#useDelimiter()方法指定在JTextField中键入所需项时计划使用的分隔符。如果你决定用分号（；）作为输入项和输入JTextField之间的分隔符：

French Fries; Whole Wheat Bread; 2% Milk

这个列表看起来更像：

French Fries
Whole Wheat Bread
2% Milk

代码是：

List<String> list = new ArrayList<>();
Scanner input = new Scanner(orderText.getText());
input.useDelimiter("\\s{0,};\\s{0,}");
while (input.hasNext()) {
    list.add(input.next());
}

要将其放入（某种）可运行的应用程序中：

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

public class GUI extends JFrame implements ActionListener {

    private static final long serialVersionUID = 1L;

    //Private the variables to make them accessible to other methods
    private static JLabel orderLabel;
    private static JTextField orderText;
    private static JButton confirmButton;

    public GUI() {
        initializeForm();
    }

    private void initializeForm() {
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setSize(350, 200);
        setAlwaysOnTop(true);
        setTitle("Place your order");
        setLocationRelativeTo(null);

        JPanel panel = new JPanel();
        panel.setLayout(null);

        //Creating label for the order text field:
        orderLabel = new JLabel("Your order:"); //Creates the label memory
        orderLabel.setBounds(10, 20, 80, 25); //Creates bounds for the label
        panel.add(orderLabel); //Adds the label to the window

        //Creating the text field
        orderText = new JTextField(); //Creates text field memory
        orderText.setActionCommand("orderText");
        orderText.setBounds(100, 22, 165, 25); //Creates text field bounds
        orderText.addActionListener(this);
        panel.add(orderText); //Adds the text field to the window

        //Creating the button to confirm order
        confirmButton = new JButton("Confirm order");
        confirmButton.setActionCommand("confirmButton");
        confirmButton.setBounds(90, 100, 170, 30);
        confirmButton.addActionListener(this);//Links the button to the action listener method inside this file
        panel.add(confirmButton);
        add(panel);
    }

    public static void main(String[] args) {
        new GUI().setVisible(true);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        String textToTokenize = orderText.getText().trim();
        // TRY to determine the delimiter used within the JTextField entry
        String delimiter = textToTokenize.replaceAll("[^:;'\"\\|\\\\~!@#$%\\^&\\"
                                                   + "*-_+=<>.?/]", "").trim();        
        if (delimiter.length() == 0) {
            delimiter = " ";
        }
        else {
            delimiter = delimiter.substring(0, 1);
        }
    
        if (!textToTokenize.isEmpty() && 
                    (e.getActionCommand().equals("confirmButton") || 
                    e.getActionCommand().equals("orderText"))) {
            List<String> shoppingList = new ArrayList<>();
            // If you want to use Scanner's next() method then 
            // just use Scanner to do it...
            Scanner input = new Scanner(textToTokenize);
            input.useDelimiter("\\s{0,}" + delimiter + "\\s{0,}");
            while (input.hasNext()) {
                shoppingList.add(input.next());
            }
            // Test...Display list in console window:
            JOptionPane.showMessageDialog(this, "<html>Supplied shopping list items are:"
                                + "<br><br><center><font color=blue>" + shoppingList.toString()
                                .replaceAll("[\\[\\]]", "") + "</font></center><br></html>", 
                                "Supplied List...", JOptionPane.INFORMATION_MESSAGE);
        }
        orderText.setText("");
        orderText.requestFocus();
    }
}