Question

我是编程的新手，上周刚开始，所以所有的java mumbojumbo对我来说都很混乱。我能够为我的BMI程序创建一个选项窗格，询问哪个单位系统（公制/英制）有无线电按钮，这决定了在找到BMI时要执行的计算。这一切都很好，除了选择一个选项时第一个选项窗格不关闭，如何选择一个选项时关闭它。我希望带有radiobuttons的jpane在do语句中关闭。

package javaapplication21;
import java.text.DecimalFormat;
import javax.swing.*;
import java.*;

public class JavaApplication21 {

    public static void main(String[] args) {
        JPanel jPanel = new JPanel();
        ButtonGroup group = new ButtonGroup();
        JRadioButton metricButton = new JRadioButton("Metric");
        metricButton.setActionCommand("Metric");
        JRadioButton imperialButton = new JRadioButton("Imperial");
        imperialButton.setActionCommand("Imperial");
        group.add(metricButton);
        group.add(imperialButton);
        jPanel.add(metricButton);
        jPanel.add(imperialButton);

        JOptionPane.showOptionDialog(null, "Please select prefered units", "BMI Calculator", JOptionPane.DEFAULT_OPTION,JOptionPane.QUESTION_MESSAGE, null, new Object[] { metricButton, imperialButton}, null);

        DecimalFormat oneDigit = new DecimalFormat("#,##0.0");

        double bodyMassIndex, weight, height;
        String unitsWeight = "-1", unitsHeight = "-1";

        do{
            if (metricButton.isSelected()){
                unitsWeight = " in kg.";
                unitsHeight = " in meters";
            }  
            else if (imperialButton.isSelected()){
                unitsWeight = " in lbs";
                unitsHeight = " in inches";
            }
        }
        while ("-1".equals(unitsWeight));

        String weightInput = JOptionPane.showInputDialog("Please enter your weight" + unitsWeight);
        String heightInput = JOptionPane.showInputDialog("Please enter your height" + unitsHeight);

        if (metricButton.isSelected()){
            height = Double.parseDouble(heightInput);
            weight = Double.parseDouble(weightInput);
            bodyMassIndex = weight / (height * height);
            System.out.println("Your Body Mass Index(BMI) is " + oneDigit.format(bodyMassIndex) + "kg/m^2"); 
             if (bodyMassIndex < 15)
                 System.out.println("You are starving");
             else if (bodyMassIndex < 18.5)
                 System.out.println("You are underweight");
             else if (bodyMassIndex < 25)
                 System.out.println("You are healthy");
             else if (bodyMassIndex < 30)
                 System.out.println("You are obese");
             else if (bodyMassIndex < 40)
                 System.out.println("You are morbidly obese");
             else 
                 System.out.println("You are at high risk of many health concerns");
        }
        else if (imperialButton.isSelected()){ 
            height = Double.parseDouble(heightInput);
            weight = Double.parseDouble(weightInput);
            bodyMassIndex = (weight * 703) / (height * height);
            System.out.println("Your Body Mass Index(BMI) is " + oneDigit.format(bodyMassIndex) + "kg/m^2"); 
                 if (bodyMassIndex < 15)
                     System.out.println("You are starving");
                 else if (bodyMassIndex < 18.5)
                     System.out.println("You are underweight");
                 else if (bodyMassIndex < 25)
                     System.out.println("You are healthy");
                 else if (bodyMassIndex < 30)
                     System.out.println("You are obese");
                 else if (bodyMassIndex < 40)
                     System.out.println("You are morbidly obese");
            else
                 System.out.println("No more big macs!");
            }
      }
}

Answer 1

在这里用这个问题的答案解决了一下

Closing A JOptionPane Programatically

它似乎有效。

我创建了一个JButton来添加到JOptionPane中的对象列表。并实现了一个响应某人点击正常事件的监听器。

这将为用户提供一些操作，使他们知道他们正在使用正确的测量，并且他们已正确点击了该选项。

将其复制到原始的JOptionPane上。

JButton yesButton = new JButton("Ok");

    yesButton.addActionListener(new ActionListener() {

        @Override
        public void actionPerformed(ActionEvent arg0) {

            Window[] windows = Window.getWindows();
            for (Window window : windows) {
                if (window instanceof JDialog) {
                    JDialog dialog = (JDialog) window;
                    if (dialog.getContentPane().getComponentCount() == 1
                            && dialog.getContentPane().getComponent(0) instanceof JOptionPane) {
                        dialog.dispose();
                    }
                }
            }

        }
    });

    JOptionPane.showOptionDialog(null, "Please select prefered units",
            "BMI Calculator", JOptionPane.DEFAULT_OPTION,
            JOptionPane.QUESTION_MESSAGE, null, new Object[] {
                    metricButton, imperialButton, yesButton }, null);

另外，当您没有单击“确定”但选择了单选按钮时，单击“关闭”按钮后程序将继续运行。所以这将是你要做的事情。

在提出问题之前，尝试通过网站找到问题的答案。但无论如何，我很乐意帮助你。

选择单选按钮后如何关闭JOptionPane？

1 个答案: