如何在Java中为复选框赋予一个值，例如“选择复选框时=加+ 20英镑”？

Question

 Fruitslbl = new JLabel(); getContentPane().add(Fruitslbl, new GridBagConstraints(0, 0, 1, 1, 0.0, 0.0, GridBagConstraints.CENTER, GridBagConstraints.NONE, new Insets(0, 0, 0, 0), 0, 0)); Fruitslbl.setText("Fruits"); 

我是Java的新手。 我正在使用GUI构建器和Eclipse。

Answer 1

首先，您将需要一个用于JCheckbox的按钮处理程序，然后将新的JButton添加到按钮处理程序中，然后将添加一个actionListener，这将给我一个具有JButton的GUI的示例，本质上是一样的。 然后在您的ButtonHandler中使其更改您想要的代码的所有值，下面还将提供一个示例

public class GameBoard extends JFrame{

private static final Color red = new Color(200,55,55);
private static final Color blue = new Color(55,55,200);
private static final Color green = new Color(55,220,55);
private static final int SIZE = 10;
static JButton[][] tiles;
private static boolean cpTurn = false;



public static void main(String[] args){

    tiles = new JButton[SIZE][SIZE];
    JLabel label = new JLabel();


    GameBoard gb = new GameBoard();
    JButton refreashButton = new JButton("Refreash");
    ButtonHandler listener = new ButtonHandler();
    refreashButton.addActionListener(listener);
    refreashButton.setName("refreash");

    JPanel mineField = new JPanel();
    mineField.setLayout(new GridLayout(10,10));
    mineField.setSize(500,500);

    for(int i = 0; i < SIZE; i++){
        for(int j = 0; j < SIZE; j++){
            tiles[i][j] = new JButton();
            tiles[i][j].setSize(50,50);
            tiles[i][j].setVisible(true);
            tiles[i][j].setBorderPainted(false);
            tiles[i][j].setContentAreaFilled(false);
            tiles[i][j].setOpaque(true);
            tiles[i][j].setBackground(green);//green
            tiles[i][j].addActionListener(listener);
            tiles[i][j].setName(i+""+j);
            mineField.add(tiles[i][j]);
        }
    }
    JPanel board = new JPanel();
    board.setLayout(new GridLayout(2,1));
    board.add(mineField);
    board.add(refreashButton);
    board.setBackground(green);*/


    JPanel board = new JPanel();
    board.setLayout(new BoxLayout(board, BoxLayout.Y_AXIS));
    board.add(mineField);
    board.add(refreashButton);



    JFrame window = new JFrame("BoardGame");
    window.setContentPane(board);
    window.setSize(600,700);
    window.setVisible(true);
    window.setResizable(false);
    window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

static class ButtonHandler implements ActionListener{
    public void actionPerformed(ActionEvent e){
        JButton btn = (JButton)e.getSource();

        if(cpTurn == false){
            if(btn.getName().equals("refreash")){
                cpTurn = false;
            }
            else{
                cpTurn = true;
                }
        } 
        else {
            cpTurn = false;
        }

        if(btn.getName().equals("refreash")){
            for(int i = 0; i < SIZE; i ++){
                for(int j = 0; j < SIZE; j++){
                tiles[i][j].setBackground(green);
                }
            }
        }

        else if(btn.getBackground().equals(green)){
            btn.setBackground(red);
        }
        else if(btn.getBackground().equals(red)){
            btn.setBackground(blue);
            String name = btn.getName();
            int x = Integer.parseInt(name.substring(0,1));
            int y = Integer.parseInt(name.substring(1));

            if(x - 1 >= 0 && tiles[x-1][y].getBackground().equals(red) ){
                tiles[x-1][y].setBackground(blue);
            }
            if(x + 1 <= 9 && tiles[x+1][y].getBackground().equals(red) ){
                tiles[x+1][y].setBackground(blue);
            }
            if(y + 1 <= 9 && tiles[x][y+1].getBackground().equals(red)){
                tiles[x][y+1].setBackground(blue);
            }
            if(y - 1 >= 0 && tiles[x][y-1].getBackground().equals(red)){
                tiles[x][y-1].setBackground(blue);
            }
        }
        else if(btn.getBackground().equals(blue)){
            btn.setBackground(green);
        }


        if(cpTurn){
        int randx = (int)(Math.random() *(10));
        int randy = (int)(Math.random() *(10));
        tiles[randx][randy].doClick();

        }
    }
}

}

Answer 2

看看这个JCheckbox-ActionListener和ItemListener？ 您必须为复选框定义动作侦听器，然后将动作放入侦听器代码中。