java - 刷新面板时如何更改 JComboBox 中选定的索引？

Question

我正在制作一个简单的数独，当我想开始新游戏时，我会重新加载面板。我首先将其删除，然后将其添加到框架中。问题是我可以选择新游戏的难度，但它总是选择第一个“简单”难度，而不是选择。因此，如果我在 JComboBox 中将其更改为“中”，则重新加载页面时，它将使用“简单”而不是“中”加载游戏。我应该怎么做才能让刷新后的面板接受更改后的难度？

以下是我的程序中使用的方法:

JComboBox difficulty = new JComboBox();
DefaultComboBoxModel difficultyModel = new DefaultComboBoxModel();
difficultyModel.addElement("Easy");
difficultyModel.addElement("Medium");
difficultyModel.addElement("Hard");
difficulty.setModel(tezavnostModel);
difficulty.setSelectedIndex(0); 
difficulty.setPreferredSize(new Dimension(100, 25));

newGame.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            mainFrame.reloadSudokuBoard();
            sudokuBoard.pickDifficulty(getDifficulty()));
        }
    });

public String getDifficulty() {
    return (String)difficulty.getSelectedItem();
}

public void board(int[][] numbers, int zeros) {
    int numberZeros = setDifficulty(sudokuForm.getDifficulty());
    int[][] boardNumbers = gameNumbers();

public void reloadSudokuBoard() {
    String newDifficulty = (sudokuForm.getDifficulty());
    remove(sudokuBoard);
    sudokuBoard.board(sudokuBoard.gameNumbers(), sudokuBoard.setDifficulty(newDifficulty ));
    add(sudokuBoard, BorderLayout.WEST);
    SwingUtilities.updateComponentTreeUI(sudokuBoard);
}

Answer 1

希望这有帮助。

    public void reloadSudokuBoard() {
    int index = difficulty.getSelectedIndex();
    String newDifficulty = (sudokuForm.getDifficulty());
    remove(sudokuBoard);
    sudokuBoard.board(sudokuBoard.gameNumbers(), sudokuBoard.setDifficulty(newDifficulty ));
    add(sudokuBoard, BorderLayout.WEST);
    SwingUtilities.updateComponentTreeUI(sudokuBoard);
    difficulty.setSelectedIndex(index);
}

在删除组件之前，您可以使用getSelectedIndex来获取所选的索引。添加元素后，setSelectedIndex 将修复它