【问题标题】：Assign int to JButtons to make method more efficient?将 int 分配给 JButtons 以使方法更有效？
【发布时间】：2015-01-21 00:46:50
【问题描述】：

我正在制作一个包含 9 个 JButton 的游戏，每个 JButton 的功能基本相同。我怎样才能使这些按钮每个都附加一个 int (0-8)，这样我就不必编写相同的方法 9 次？这是目前的方法：

public void actionPerformed(ActionEvent e) {

        if(e.getSource() == cardOne) {
            if(boardArray.get(0).selected == false) {
                getPath(0);
                buttons[0].setIcon(selectedIcon);
                boardArray.get(0).selected = true;

            }else{
                boardArray.get(0).selected = false;
                buttons[0].setIcon(boardArray.get(0).cardImage);
            }

        }
        if(e.getSource() == cardTwo) {
            if(boardArray.get(1).selected == false) {
                getPath(1);
                buttons[1].setIcon(selectedIcon);
                boardArray.get(1).selected = true;
            }else{
                boardArray.get(1).selected = false;
                buttons[1].setIcon(boardArray.get(1).cardImage);
            }

        }
        if(e.getSource() == cardThree) {
            if(boardArray.get(2).selected == false) {
                getPath(2);
                buttons[2].setIcon(selectedIcon);
                boardArray.get(2).selected = true;
            }else{
                boardArray.get(2).selected = false;
                buttons[2].setIcon(boardArray.get(2).cardImage);
            }

        }
        if(e.getSource() == cardFour) {
            if(boardArray.get(3).selected == false) {
                getPath(3);
                buttons[3].setIcon(selectedIcon);
                boardArray.get(3).selected = true;
            }else{
                boardArray.get(3).selected = false;
                buttons[3].setIcon(boardArray.get(3).cardImage);
            }

        }
        if(e.getSource() == cardFive) {
            if(boardArray.get(4).selected == false) {
                getPath(4);
                buttons[4].setIcon(selectedIcon);
                boardArray.get(4).selected = true;

            }else{
                boardArray.get(4).selected = false;
                buttons[4].setIcon(boardArray.get(4).cardImage);
            }

        }
        if(e.getSource() == cardSix) {
            if(boardArray.get(5).selected == false) {
                getPath(5);
                buttons[5].setIcon(selectedIcon);
                boardArray.get(5).selected = true;
            }else{
                boardArray.get(5).selected = false;
                buttons[5].setIcon(boardArray.get(5).cardImage);
            }

        }
        if(e.getSource() == cardSeven) {
            if(boardArray.get(6).selected == false) {
                getPath(6);
                buttons[6].setIcon(selectedIcon);
                boardArray.get(6).selected = true;
            }else{
                boardArray.get(6).selected = false;
                buttons[6].setIcon(boardArray.get(6).cardImage);
            }

        }
        if(e.getSource() == cardEight) {
            if(boardArray.get(7).selected == false) {
                getPath(7);
                buttons[7].setIcon(selectedIcon);
                boardArray.get(7).selected = true;
            }else{
                boardArray.get(7).selected = false;
                buttons[7].setIcon(boardArray.get(7).cardImage);
            }

        }
        if(e.getSource() == cardNine) {
            if(boardArray.get(8).selected == false) {
                getPath(8);
                buttons[8].setIcon(selectedIcon);
                boardArray.get(8).selected = true;
            }else{
                boardArray.get(8).selected = false;
                buttons[8].setIcon(boardArray.get(6).cardImage);
            }

        }

【问题讨论】：

标签： java swing icons jbutton actionlistener

【解决方案1】：

你可以...

通过某种Map 将每个JButton 与int 关联...

private Map<JButton, Integer> mapButtons;
//...
mapButtons = new HashMap<JButton, Integer>(25);
mapButtons.put(cardOne, 1);

然后你可以只提取ActionListener中的整数值

public void actionPerformed(ActionEvent e) {
    Object source = e.getSource();
    if (source instanceof JButton) {
        JButton btn = (JButton)source;
        int value = mapButtons.get(btn);

如果您不想在代码中引入另一个对象...

你可以...

通过按钮clientProperty 属性关联一个值...

btn.putClientProperty("value", 1);

public void actionPerformed(ActionEvent e) {
    Object source = e.getSource();
    if (source instanceof JButton) {
        JButton btn = (JButton)source;
        value = (Integer)btn.getClientProperty("value");

你可以...

使用按钮actionCommand 属性，该属性需要String，但您可以将其转换为int 值。它有点乱，但可以完成工作......

【讨论】：

【解决方案2】：

您可以使用setActionCommand() 为每个按钮设置其对应的编号，并在actionPerformed 方法中调用e.getActionCommand() 并将String 解析为int

【讨论】：

【解决方案3】：

另一种可能性是创建一个实现ActionListener 的内部类，如下所示：

  public class ButtonActionListener implements ActionListener {
    private final int boardElement;

    ButtonActionListener(int boardElement) {
      this.boardElement = boardElement;
    }

    @Override
    public void actionPerformed(ActionEvent e) {
      if (boardArray.get(boardElement).selected == false) {
        getPath(boardElement);
        buttons[boardElement].setIcon(selectedIcon);
        boardArray.get(boardElement).selected = true;
      } else {
        boardArray.get(boardElement).selected = false;
        buttons[boardElement].setIcon(boardArray.get(boardElement).cardImage);
      }
    }
  }

然后，当您创建 JButton 对象时，使用所需索引添加此操作侦听器的实例：

  // Just an example, it's not clear to me how the buttons[] array is created
  for (int i = 0; i < boardArray.size(); ++i) {
    buttons[i] = new JButton();
    // Other stuff as needed
    buttons[i].addActionListener(new ButtonActionListener(i));
  }

【讨论】：