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  1. import javax.swing.*;
  2. import javax.swing.border.EmptyBorder;
  3. import javax.swing.border.EtchedBorder;
  4. import java.awt.*;
  5. import java.awt.event.ActionEvent;
  6. import java.awt.event.ActionListener;
  7. import java.util.HashMap;
  8. import java.util.LinkedHashMap;
  9.  
  10. public class Ramen extends JFrame implements ActionListener {
  11.  
  12.     private static final String TASTE_SYOYU = "醤油";
  13.     private static final String TASTE_MISO = "味噌";
  14.     private static final String TASTE_SIO = "塩";
  15.     private static final String TOPPING_PORK = "チャーシュー";
  16.     private static final String TOPPING_NEGI = "ネギ";
  17.     private static final String TOPPING_MENMA = "メンマ";
  18.  
  19.     private HashMap<String, AbstractButton> tastesAndToppings;
  20.     private HashMap<String, Integer> prices;
  21.     private JLabel fee, result, unit;
  22.  
  23.     public static void main(String[] args) {
  24.         Ramen ramen = new Ramen("ラーメンの代金");
  25.         ramen.setVisible(true);
  26.     }
  27.  
  28.     Ramen(String title) {
  29.         setTitle(title);
  30.         setSize(350, 200);
  31.         setLocationRelativeTo(null);
  32.         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  33.  
  34.         JPanel panel = new JPanel();
  35.         GridLayout layout = new GridLayout(3, 3);
  36.         panel.setLayout(layout);
  37.  
  38.         prices = new HashMap<>();
  39.         prices.put(TASTE_SYOYU, 500);
  40.         prices.put(TASTE_MISO, 600);
  41.         prices.put(TASTE_SIO, 550);
  42.         prices.put(TOPPING_PORK, 200);
  43.         prices.put(TOPPING_NEGI, 100);
  44.         prices.put(TOPPING_MENMA, 100);
  45.  
  46.         tastesAndToppings = new LinkedHashMap<>();
  47.         tastesAndToppings.put(TASTE_SYOYU, new JRadioButton(TASTE_SYOYU));
  48.         tastesAndToppings.put(TASTE_MISO, new JRadioButton(TASTE_MISO));
  49.         tastesAndToppings.put(TASTE_SIO, new JRadioButton(TASTE_SIO));
  50.         tastesAndToppings.put(TOPPING_PORK, new JCheckBox(TOPPING_PORK));
  51.         tastesAndToppings.put(TOPPING_NEGI, new JCheckBox(TOPPING_NEGI));
  52.         tastesAndToppings.put(TOPPING_MENMA, new JCheckBox(TOPPING_MENMA));
  53.  
  54.         ButtonGroup group = new ButtonGroup();
  55.         group.add(tastesAndToppings.get(TASTE_SYOYU));
  56.         group.add(tastesAndToppings.get(TASTE_MISO));
  57.         group.add(tastesAndToppings.get(TASTE_SIO));
  58.  
  59.         tastesAndToppings.forEach((key, value) -> {
  60.             panel.add(value);
  61.             value.addActionListener(this);
  62.         });
  63.  
  64.         fee = new JLabel("料金");
  65.         result = new JLabel();
  66.         unit = new JLabel("円");
  67.  
  68.         result.setBorder(new EtchedBorder(EtchedBorder.LOWERED));
  69.         unit.setBorder(new EmptyBorder(0, 10, 0, 0));
  70.  
  71.         result.setOpaque(true);
  72.         result.setBackground(Color.WHITE);
  73.  
  74.         panel.add(fee);
  75.         panel.add(result);
  76.         panel.add(unit);
  77.  
  78.         tastesAndToppings.get(TASTE_SYOYU).doClick();
  79.  
  80.         getContentPane().add(panel, BorderLayout.CENTER);
  81.     }
  82.  
  83.     public void actionPerformed(ActionEvent e) {
  84.         int resultPrice = tastesAndToppings.values().stream()
  85.                 .filter(AbstractButton::isSelected)
  86.                 .mapToInt(value -> prices.get(value.getText()))
  87.                 .sum();
  88.         result.setText(String.valueOf(resultPrice));
  89.     }
  90.  
  91. }
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
Main.java:10: error: class Ramen is public, should be declared in a file named Ramen.java
public class Ramen extends JFrame implements ActionListener {
       ^
1 error
stdout
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Standard output is empty
https://ideone.com/PSMgpK
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
secret

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