java - 我应该在哪里正确声明我的 "count"可用？

Question

我想知道应该在哪里正确放置 countA，因为我希望将计数添加到所做的每个按钮中。开头的“count”变量用于制作新按钮，“countA”是我试图声明的计数，但它无法编译。这是我的代码片段:我的问题再次是，我应该在哪里声明 countA 变量，以便它每次为我的按钮创建一个新的计数。谢谢!

                public static int count = 0;

                class ClickListener implements ActionListener
                {                                   
                    public void actionPerformed(ActionEvent e) 
                    {                                                        
                        count++;            
                        if (count % 2 != 0)    
                        {                                                                                                                                                                                                                                                        
                            str = JOptionPane.showInputDialog("What is the name of the new Button?"); 
                            JButton b = new JButton(str);
                            b18.setPreferredSize(new Dimension(125, 25));

                            int countA = 0;

                            b.setBackground(Color.BLUE);
                            b.setContentAreaFilled(false);
                            b.setOpaque(true);
                            b.setFocusable(false);

                            add(b18);

                            class ClickListenerEighteen implements ActionListener
                            {

                                public void actionPerformed(ActionEvent e)
                                {                                                                                                                         
                                    countA++;

                                    if (countA % 2 != 0)
                                    {

                                        System.out.println("This new button was clicked")                                                                                       
                                    }                                      
                                    else 
                                    {                                            
                                        System.out.println("This button was clicked so that I know");                                                                                                                                                                                    
                                    }                                        
                                }                                   
                            }
                            ActionListener bClicked = new ClickListener();
                            b.addActionListener(bClicked);
                        }
                    } 
                }

Answer 1

how would I make it an instance field of the ActionListener?

就像您在任何其他类(class)中一样......

class ClickListener implements ActionListener
{       
    protected int countA;                            
    public void actionPerformed(ActionEvent e) 
    {                                                        
        count++;