Question

我是Java的初学者，我需要制作一个滚动1-8个骰子的程序。如何添加一个文本框，我可以用Java Netbeans填写要显示（和滚动）的骰子数量？

这是我掷3骰子的代码：

public class ToetsJan extends JFrame {
    public static void main(String args[]){
        JFrame frame = new ToetsJan();
        frame.setSize(600,400);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setTitle("Dobbelsteen toets");
        frame.setContentPane(new TekenPaneel());
        frame.setVisible(true);
    }
}

class TekenPaneel extends JPanel {

    private Dobbelsteen steen1, steen2, steen3;
    private JButton werpKnop;

    //constructor
    public TekenPaneel() {
        setLayout(null);

        steen1=new Dobbelsteen(1);
        steen2=new Dobbelsteen(3);
        steen3=new Dobbelsteen(5);

        werpKnop = new JButton();
        werpKnop.setText("Gooi!");
        werpKnop.setBounds(50,150,70,25);
        werpKnop.addActionListener(new WerpKnopHandler());
        add (werpKnop);
    }

    public void paintComponent(Graphics g){
        super.paintComponent(g);
        steen1.tekenStenen(g);
        steen1.tekenOgen(g);
        steen2.tekenStenen(g);
        steen2.tekenOgen(g);
        steen3.tekenStenen(g);
        steen3.tekenOgen(g);
    }


    class WerpKnopHandler implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            steen1.gooi();
            repaint();
        }
    }

}


public class Dobbelsteen{
    private int x, y;


    public Dobbelsteen(int x){
        this.x = x;
        y = 50*x;
    }

    public void tekenStenen(Graphics g){
        // Teken de dobbelsteen
        g.setColor( Color.BLACK );
        g.fillRoundRect((y), 55, 60, 60, 25, 25 );
        g.setColor( Color.WHITE );
        g.drawRoundRect((y), 55, 60, 60, 25, 25 );
    }

    public void tekenOgen(Graphics g){    
           int getal = gooi();   
           if (getal == 1) {
               g.fillOval((y+25), 80, 8, 8);
            }
            else if (getal ==  2) {
                g.fillOval((y+5), 60, 8, 8);
                g.fillOval((y+45), 100, 8, 8);
            }
            else if (getal ==  3){
                g.fillOval((y+25), 80, 8, 8);
                g.fillOval((y+5), 60, 8, 8);
                g.fillOval((y+45), 100, 8, 8);
            }
            else if (getal ==  4){
                g.fillOval((y+5), 60, 8, 8);
                g.fillOval((y+45), 100, 8, 8);
                g.fillOval((y+5), 100, 8, 8);
                g.fillOval((y+45), 60, 8, 8);
            }
            else if (getal ==  5){
                g.fillOval((y+25), 80, 8, 8);
                g.fillOval((y+5), 60, 8, 8);
                g.fillOval((y+45), 100, 8, 8);
                g.fillOval((y+5), 100, 8, 8);
                g.fillOval((y+45), 60, 8, 8);
            }
            else if (getal ==  6){
                g.fillOval((y+5), 60, 8, 8);
                g.fillOval((y+45), 100, 8, 8);
                g.fillOval((y+5), 100, 8, 8);
                g.fillOval((y+45), 60, 8, 8);
                g.fillOval((y+5), 80, 8, 8);
                g.fillOval((y+45), 80, 8, 8);
            }    
    }

    public int gooi() {
        return (int) (6 * Math.random() + 1);
    }
}

Answer 1

您的代码布局是火车残骸。请使用匹配的缩进编写整洁易读的代码。我建议你使用英文名称来表示类，变量和方法。否则，当您将它们与JDK或几乎总是英语的库名称一起阅读时，它将会令人困惑。

要显示文本对话框，您可以使用以下代码：

public class TextDialog extends Dialog implements ActionListener {

    private static final long serialVersionUID = 1L;
    private boolean dialogCompleted = false;
    private Button ok, can;
    private TextField input;

    public TextDialog() {

        super(new Frame(""), "Text dialog", true);
        setLayout(new FlowLayout());
        input = new TextField(15);                                
        add(new Label("Input :"));
        add(input);                
        addOKCancelPanel();
        createFrame();
        pack();
        setVisible(true);
    }

    private void addOKCancelPanel() {

        Panel p = new Panel();
        p.setLayout(new FlowLayout());
        createButtons(p);
        add(p);
    }

    private void createButtons(Panel p) {

        p.add(ok = new Button("OK"));
        ok.addActionListener(this);
        p.add(can = new Button("Cancel"));
        can.addActionListener(this);
    }

    private void createFrame() {

        Dimension d = getToolkit().getScreenSize();
        setLocation(d.width / 4, d.height / 3);
    }

    public void actionPerformed(ActionEvent ae) {

        if (ae.getSource() == ok) {

            dialogCompleted = true;
            setVisible(false);
        } else if (ae.getSource() == can) {

            dialogCompleted = false;
            setVisible(false);
        }
    }

    public boolean isDialogCompleted() {
        return dialogCompleted;
    }

    public String getInput() {
        return input.getText();
    }     
}

要设置任意数量的骰子，您需要一个可以容纳任意数量骰子的数据结构。看看java.util.List

例如：

private List<Dobbelsteen> dice;

public TekenPaneel() {

    TextDialog dialog = new TextDialog();
    int numberOfDice;
    if (dialog.isDialogCompleted()) {
        numberOfDice = Integer.parseInt(dialog.getInput());
    }
    else {
        // use a default if the user cancels the input
        numberOfDice = 2;
    }
    dice = new ArrayList<Dobbelsteen>();
    int x = 1;
    for(int i = 1; i < numberOfDice; i++) {   
        dice.add(new Dobbelsteen(x));
        x = x + 2;
    }

如何制作更多骰子？

1 个答案: