プログラムが表示されません

Question

私はサイコロをするコードを作った、コードはまだ完全には完了していません。私はそれをチェックしたかったが、プログラムを実行すると、ボタン/コンボボックスのどれも表示されませんでした。誰かが私のコードに何が間違っていて、それを修正する方法を教えてもらえますか？

これが今の私のコードです：

public class StartGame implements ActionListener { 
    @Override 
    public void actionPerformed(ActionEvent arg0) { 
     JFrame game = new JFrame(); 
     game.setSize(800, 400); 
     game.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     game.setMinimumSize(new Dimension(300, 100)); 
     game.setLocation(300, 150); 
     game.setVisible(true); 
    } 

    private int[] zijden = {4, 6, 8, 10, 12, 20}; 
    Random r = new Random(); 
    private int chosenDiceNumber = 1; 
    private int chosenSidesNumber = 4; 
    static JLabel result = new JLabel(); 

    public void Dices() { 
     getContentPane().setLayout(new FlowLayout()); 
     JComboBox<String> sides = new JComboBox<String>(); 
     for (int i = 0; i < zijden.length; i++) { 
      sides.addItem("" + zijden[i] + " Sides"); 
     } 
     sides.addActionListener(new ActionListener() { 
      @Override 
      public void actionPerformed(ActionEvent event) { 
       JComboBox number = (JComboBox) event.getSource(); 
       String selectedValue = number.getSelectedItem().toString(); 
       chosenSidesNumber = Integer.valueOf((selectedValue.split("\\s+"))[0]); 
      } 
     }); 
     getContentPane().add(sides); 

     JComboBox<String> number = new JComboBox<String>(); 
     number.addItem("1 Dice"); 
     number.addItem("2 Dices"); 
     number.addItem("3 Dices"); 
     number.addItem("4 Dices"); 
     number.addItem("5 Dices"); 
     number.addItem("6 Dices"); 
     number.addItem("7 Dices"); 
     number.addItem("8 Dices"); 

     number.addActionListener(new ActionListener() { 
      @Override 
      public void actionPerformed(ActionEvent event) { 
       JComboBox number = (JComboBox) event.getSource(); 
       String selectedValue = number.getSelectedItem().toString(); 
       chosenDiceNumber = Integer.valueOf((selectedValue.split("\\s+"))[0]); 
      } 
     }); 
     getContentPane().add(number); 

     JButton button1 = new JButton("Throw!"); 
     add(button1); 

     JButton button2 = new JButton("Best Yahtzee move"); 

     button1.addActionListener(new ActionListener() { 
      @Override 
      public void actionPerformed(ActionEvent e) { 
       StringBuilder sb = new StringBuilder("Rolled: "); 
       for (int i=0; i<chosenDiceNumber; i++) { 
        sb.append(getNextValue()).append(", "); 
       } 
       sb.delete(sb.length()-2, sb.length()); 
       result.setText(sb.toString()); 

       private void add(JButton button2) { 
        // TODO Auto-generated method stub 
       } 
      }); 

      private Object getNextValue() { 
       // TODO Auto-generated method stub 
       return null; 
      } 
     }); 
     add(result); 
    } 

    private void add(JButton button1) { 
     // TODO Auto-generated method stub 
    } 

    private void add(JLabel result2) { 
     // TODO Auto-generated method stub 
    } 

    private AbstractButton getContentPane() { 
     // TODO Auto-generated method stub 
     return null; 
    } 

    private int getNextValue() { 
     return r.nextInt(chosenSidesNumber) + 1; 
    } 
} 

Answer 1

は、フレームを追加し、メソッドのパラメータとして渡します。

public void Dices(JFrame game) { 
      game.setLayout(new FlowLayout()); 
      JComboBox<String> sides = new JComboBox<String>(); 
      for (int i = 0; i < zijden.length; i++) { 
       sides.addItem("" + zijden[i] + " Sides"); 
      } 
      sides.addActionListener(new ActionListener() { 
       @Override 
       public void actionPerformed(ActionEvent event) { 
        JComboBox number = (JComboBox) event.getSource(); 
        String selectedValue = number.getSelectedItem().toString(); 
        chosenSidesNumber = Integer.valueOf((selectedValue.split("\\s+"))[0]); 
       } 
      }); 
      game.add(sides); 

      JComboBox<String> number = new JComboBox<String>(); 
      number.addItem("1 Dice"); 
      number.addItem("2 Dices"); 
      number.addItem("3 Dices"); 
      number.addItem("4 Dices"); 
      number.addItem("5 Dices"); 
      number.addItem("6 Dices"); 
      number.addItem("7 Dices"); 
      number.addItem("8 Dices"); 

      number.addActionListener(new ActionListener() { 
       @Override 
       public void actionPerformed(ActionEvent event) { 
        JComboBox number = (JComboBox) event.getSource(); 
        String selectedValue = number.getSelectedItem().toString(); 
        chosenDiceNumber = Integer.valueOf((selectedValue.split("\\s+"))[0]); 
       } 
      }); 
      game.add(number); 

      JButton button1 = new JButton("Throw!"); 
      game.add(button1); 

      JButton button2 = new JButton("Best Yahtzee move"); 

      button1.addActionListener(new ActionListener() { 
       @Override 
       public void actionPerformed(ActionEvent e) { 
        StringBuilder sb = new StringBuilder("Rolled: "); 
        for (int i = 0; i < chosenDiceNumber; i++) { 
         sb.append(getNextValue()).append(", "); 
        } 
        sb.delete(sb.length() - 2, sb.length()); 
        result.setText(sb.toString()); 
       } 
      }); 
      game.add(result); 
     }