Multiple JOptionPane input dialogs?

问题

I've been looking for the past hour, but I haven't been able to find the solution I am looking for.

I'm wanting to take multiple inputs from the user using JOptionPane, but I don't want them to all be in one dialog window. I'm wanting it to transition to the next or just make the next one pop up. Is there a way to do that using JOptionPane?

Here's what I have so far:

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();

    }

}

回答1:

Apart from my above recommendations, here are some others that will be needed to understand the below code (PLEASE READ THEM ALL BEFORE GOING FOR THE CODE PART ONLY)

Read what a layout manager is and how they work, especially take a look at Grid Layout and Box Layout, Google for examples and explanations if you don't understand the tutorial.
Read what methods are and how they work.
Read about the Event Dispatch Thread (EDT) and its function.
Be careful to not mix console application paradigm and GUI application paradigm. Use one or the other.
Learn How to use Dialogs
Read how to convert a String o a int and look how to convert to double.
For your boolean field I would use a JRadioButton including a ButtonGroup and how to get which radiobutton was selected in a buttongroup:

This code should give you a starting point on your way to finish it yourself

The annoyingGui while shorter, is not my favorite since it opens a new dialog for the user each time you want to get an imput from them, which is annoying.
The singleDialogInformation() displays a more complex GUI using a JPanel and GridLayout for requesting user information and a BoxLayout to show it back to the user, note that I'm not using 2 different variables, but reassigning the pane variable to a new instance of a JPanel with a different layout.

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);
        }
    }
}

Screenshots of the annoyingGui:

Screenshots of the singleDialogInformation:

来源：https://stackoverflow.com/questions/41904362/multiple-joptionpane-input-dialogs

标签

java

swing

joptionpane