请求部分的java输出字

Question

import javax.swing.*;
public class CarCareChoice2
{
    public static void main(String[] args)
    {
    final int NUM_OF_ITEMS = 8;
    String[] validChoices = {"oil change", "tire rotation", "battery check", "brake inspection"};
    int[] prices = {25, 22, 15, 5};
    String strOptions;
    String careChoice;
    double choicePrice = 0.0;
    boolean validChoice = false;
    strOptions = JOptionPane.showInputDialog(null, "Please enter one of the following care options: oil change, tire rotation, battery check, or brake inspection");
    careChoice = strOptions;
    for(int x = 0; x < NUM_OF_ITEMS; ++x)
    {
        if(careChoice.equals(validChoices[x]))
        {
            validChoice = true;
            choicePrice = prices[x];
        }
     }
     if(validChoice)
         JOptionPane.showMessageDialog(null, "The price of a(an) " + careChoice + " is $" + choicePrice);
     else
         JOptionPane.showMessageDialog(null, "Sorry - invalid entry");

    }
}

用户只需输入服务的前3个字母，即可获得他们输入的服务及其匹配价格。这是到目前为止我的代码

Answer 1

User should only have to input the first 3 letters of the service and get the service they entered and its matching price

这看起来不像是我会使用的方法，它不是用户友好的（IMHO），还有其他解决方法（按我认为最好的解决方法排序）

1. 使用带有预定义选项的showInputDialog，看起来像JComboBox

   

2. 使用一个自定义的JPanel将作为消息传递，并使用JRadioButton以便用户可以选择其中一个（当然，您可以更改layout manager使其看起来不同

   

3. 最后是一种丑陋的方式，要求用户编写它，并使用^{}对services变量和userInput变量进行比较，使用^{}方法（这是您试图实现的）：

   

它们都产生了与此类似的输出：

注释/取消注释每个方法以查看它们的行为，并相应地选择生成上述每个输出的代码：

import java.awt.Component;

import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.SwingUtilities;

public class CarCareChoice {
    
    private JFrame frame;
    private String[] services = {"Oil change", "Tire rotation", "Battery check", "Brake inspection"};
    
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                CarCareChoice carCareChoice = new CarCareChoice();
//              carCareChoice.comboWay();
//              carCareChoice.radioWay();
                carCareChoice.textUglyWay();
            }
        });
    }
    
    public void comboWay() {
        frame = new JFrame();
        
        String userSelection = (String) JOptionPane.showInputDialog(frame, "Please select one of the following", "Service selection", 
                JOptionPane.PLAIN_MESSAGE, null, services, services[0]);
        
        if (userSelection != null) {
            JOptionPane.showMessageDialog(frame, "The service selected was: " + userSelection);
        }
    }
    
    public void radioWay() {
        frame = new JFrame();
        JPanel pane = new JPanel();
        JRadioButton[] buttons = new JRadioButton[services.length];
        ButtonGroup group = new ButtonGroup();
        
        for (int i = 0; i < buttons.length; i++) {
            buttons[i] = new JRadioButton(services[i]);
            group.add(buttons[i]);
            pane.add(buttons[i]);
        }
        
        int option = JOptionPane.showConfirmDialog(frame, pane, "Service selection", JOptionPane.PLAIN_MESSAGE, JOptionPane.YES_NO_OPTION);
        
        JRadioButton userSelection = null;
        
        if (option == JOptionPane.YES_OPTION) {
            for (Component c : pane.getComponents()) {
                if (c instanceof JRadioButton) {
                    if (((JRadioButton) c).isSelected()) {
                        userSelection = (JRadioButton) c;
                        break;
                    }
                }
            }
            if (userSelection != null) {
                JOptionPane.showMessageDialog(frame, "Service selected: " + userSelection.getText());
            } else {
                JOptionPane.showMessageDialog(frame, "C'mon man! Select something");
            }
        }
    }
    
    public void textUglyWay() {
        frame = new JFrame();
        
        String userSelection = (String) JOptionPane.showInputDialog(frame, "Please select one of the following", "Service selection", 
                JOptionPane.PLAIN_MESSAGE);
        
        if (userSelection != null && !userSelection.equals("")) {
            for (String s : services) {
                if (s.toLowerCase().startsWith(userSelection.toLowerCase())) {
                    userSelection = s;
                    break;
                }
            }
            JOptionPane.showMessageDialog(frame, "The service selected was: " + userSelection);
        }
    }
}

---

重要提示：

您的程序也没有放在Event Dispatch Thread (EDT)上，这可能会在将来导致一些线程问题，因此请确保将您的所有程序放在其中，就像我放在Event Dispatch Thread (EDT)上一样：

public static void main(String[] args) {
    SwingUtilities.invokeLater(new Runnable() {
        @Override
        public void run() {
            //Your constructor here
        }
    });
}