多个JOptionPane输入对话框？

Question

我一直在寻找过去的一个小时，但是我一直找不到想要的解决方案。

我想使用JOptionPane从用户那里获取多个输入，但是我不希望它们全部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？

这是我到目前为止的内容：

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

除了我上面的建议外，这里还需要一些其他的东西来理解以下代码（ 请仅在阅读代码部分之前阅读所有内容 ）

1. 阅读布局管理器及其工作原理，尤其是在不了解本教程的情况下，请阅读Google的Grid Layout和Box Layout以获得示例和说明。

2. 阅读什么是方法以及它们如何工作。

3. 阅读有关事件调度线程（EDT）及其功能的信息 。

4. 注意不要混合使用控制台应用程序范例和GUI应用程序范例。 使用一个或另一个。

5. 了解如何使用对话框

6. 阅读如何将String转换为int并查看如何转换为double 。

7. 对于您的boolean字段，我将使用一个包含ButtonGroup的JRadioButton以及如何获取在buttongroup中选择哪个单选按钮的方法 ：

---

此代码应为您自己完成此方法提供一个起点

• 较短的annoyingGui并不是我的最爱，因为每次您想要从用户那里获得输入时，它都会为用户打开一个新对话框，这很烦人。

• singleDialogInformation()使用JPanel和GridLayout来显示更复杂的GUI，以请求用户信息，并使用BoxLayout将其显示回给用户，请注意，我没有使用2个不同的变量，而是将pane变量重新分配给的新实例。具有不同布局的JPanel 。

---

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屏幕截图：

singleDialogInformation屏幕截图：