多个 JOptionPane 输入对话框？

Question

过去一个小时我一直在寻找，但我一直无法找到我正在寻找的解决方案。

我想使用JOptionPane 从用户那里获取多个输入，但我不希望它们都在一个对话框窗口中。我希望它过渡到下一个，或者只是弹出下一个。有没有办法使用JOptionPane 做到这一点？

这是我目前所拥有的：

import java.util.Scanner;
import javax.swing.*;
public class HomeWork2 {


    public static void main(String[] args) {

        Scanner input = new Scanner(System.in);
        Scanner input2 = new Scanner(System.in);
        Scanner input3 = new Scanner(System.in);
        Scanner input4 = new Scanner(System.in);
        int days, assignments;
        double temperature;
        boolean isRaining;

        JOptionPane.showInputDialog("How many days are left?");
        days = input.nextInt();

        JOptionPane.showInputDialog("How many assignments are due?");
        assignments = input2.nextInt();

        JOptionPane.showInputDialog("What is the temperature outside?");
        temperature = input3.nextDouble();

        JOptionPane.showInputDialog("Is it raining today?");
        isRaining = input4.nextBoolean();

        if(assignments<=0)
            JOptionPane.showMessageDialog(null, "Why are you asking in the first place?");
        else
            if(days<5)
                JOptionPane.showMessageDialog(null, "You need to hurry up, time is short.");
            else
                if(assignments>4)
                    JOptionPane.showMessageDialog(null, "You need to hurry up before the assignments pile up. Oh wait...");
                else
                    if(temperature<50)
                        JOptionPane.showMessageDialog(null, "You should start working, it's not like it's warm eoungh to do anything.");
                    else
                        if(isRaining==true)
                            JOptionPane.showMessageDialog(null, "It's raining, you might as well start on your assignments.");
                        else
                            JOptionPane.showMessageDialog(null, "It's nice out and you have some time to spare, go have fun.");

        input.close();
        input2.close();
        input3.close();
        input4.close();

    }

}

Answer 1

除了我上面的建议之外，还有一些其他内容需要了解以下代码（请在阅读代码部分之前全部阅读）

1. 阅读 layout manager 是什么以及它们是如何工作的，尤其是看看 ​​Grid Layout 和 Box Layout，如果您不理解本教程，请在 Google 上查看示例和解释。

2. 了解methods 是什么以及它们是如何工作的。

3. 了解Event Dispatch Thread (EDT) 及其function。

4. 注意不要混合控制台应用程序范式和 GUI 应用程序范式。使用其中一种。

5. 学习How to use Dialogs

6. 阅读 how to convert a String o a int 并了解如何转换为 double。

7. 对于您的boolean 字段，我将使用JRadioButton，包括ButtonGroup 和how to get which radiobutton was selected in a buttongroup：

---

这段代码应该为您自己完成它提供一个起点

• annoyingGui 虽然较短，但不是我最喜欢的，因为每次您想从他们那里获得输入时，它都会为用户打开一个新对话框，这很烦人。

• singleDialogInformation() 显示更复杂的 GUI，使用 JPanel 和 GridLayout 请求用户信息和 BoxLayout 将其显示给用户，请注意我没有使用 2 个不同的变量，但将 pane 变量重新分配给具有不同布局的 JPanel 的新实例。

---

import java.awt.GridLayout;

import javax.swing.BoxLayout;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;

public class UsingDialogsExample {

    private JFrame frame;
    private JPanel pane;
    private JTextField daysField;
    private JTextField assignmentField;
    private int days = 0;
    private int assignments = 0;

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                //Comment / uncomment one of them to see the output related to each sample method.
//              new UsingDialogsExample().annoyingGui();
                new UsingDialogsExample().singleDialogInformation();
            }
        });
    }

    public void annoyingGui() {
        frame = new JFrame("My Frame's Title");

        String daysInput = JOptionPane.showInputDialog(frame, "How many days are left?"); //Get user input on the textfield as a String
        String assignmentsInput = JOptionPane.showInputDialog(frame, "How many assignments are due?");

        try {
            days = Integer.parseInt(daysInput); //Convert the string gotten above to an int
            assignments = Integer.parseInt(assignmentsInput);
        } catch (NumberFormatException nfe) {
            nfe.printStackTrace();
        }

        JOptionPane.showMessageDialog(frame, "The number of days left is: " + days);
        JOptionPane.showMessageDialog(frame, "The number of assignments due is: " + assignments);
    }

    public void singleDialogInformation() {
        pane = new JPanel();
        pane.setLayout(new GridLayout(0, 2, 2, 2));

        daysField = new JTextField(5);
        assignmentField = new JTextField(5);

        pane.add(new JLabel("How many days are left?"));
        pane.add(daysField);

        pane.add(new JLabel("How many assignments are due?"));
        pane.add(assignmentField);

        int option = JOptionPane.showConfirmDialog(frame, pane, "Please fill all the fields", JOptionPane.YES_NO_OPTION, JOptionPane.INFORMATION_MESSAGE);

        if (option == JOptionPane.YES_OPTION) {

            String daysInput = daysField.getText();
            String assignmentsInput = assignmentField.getText();

            try {
                days = Integer.parseInt(daysInput);
                assignments = Integer.parseInt(assignmentsInput);
            } catch (NumberFormatException nfe) {
                nfe.printStackTrace();
            }

            pane = new JPanel();
            pane.setLayout(new BoxLayout(pane, BoxLayout.PAGE_AXIS));

            pane.add(new JLabel("Days left: " + days));
            pane.add(new JLabel("Assignments due: " + assignments));

            JOptionPane.showMessageDialog(frame, pane);
        }
    }
}

annoyingGui的截图：

singleDialogInformation的截图：