Question

JButton btnNewButton = new JButton("Pepsi");
    btnNewButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            changeD();
        }
    });
    btnNewButton.setBounds(23, 11, 80, 29);
    contentPane.add(btnNewButton);
    JButton btnNewButton_1 = new JButton("Sprite");
    btnNewButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            changeD();
        }
    });
    btnNewButton_1.setBounds(113, 11, 80, 29);
    contentPane.add(btnNewButton_1);
    JButton btnFanta = new JButton("Fanta");
    btnNewButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            changeD();
        }

    });

这些是调用方法的按钮。这是我遇到问题的地方，只有一个按钮点击工作，百事可乐按钮

接下来的部分是我正在呼唤的恶意。它确定输入的硬币和金额是否正确。

public double changeD() {

        JOptionPane.showMessageDialog(null, "This Product costs 1.50 EU");
        String payment = JOptionPane.showInputDialog(null, "Please insert cash");
        int intAmount = Integer.parseInt(payment); 
        double drinkPrice = 1.50;
        double changeDue = intAmount - drinkPrice;
        if (intAmount == 2 + 1 + .50 && intAmount > drinkPrice) 

        {
            JOptionPane.showInputDialog(null, "Please take your product and change " + changeDue);

        }

        else if (intAmount != 2 + 1 + .50 || intAmount < drinkPrice)

        {
            JOptionPane.showMessageDialog(null, "Please insert correct amount or coins ");
        }

         return (Double) null;

Answer 1

请注意，您可能会错误地复制粘贴，并使用ActionListener设置相同的按钮两次

JButton btnNewButton = new JButton("Pepsi");
btnNewButton.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) {
        changeD();
    }
});
btnNewButton.setBounds(23, 11, 80, 29);
contentPane.add(btnNewButton);
JButton btnNewButton_1 = new JButton("Sprite");

//Wrong button here !!!!!!!!!!!!!!!!!!! Should be btnNewButton_1 
btnNewButton.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) {
        changeD();
    }
});
btnNewButton_1.setBounds(113, 11, 80, 29);
contentPane.add(btnNewButton_1);
JButton btnFanta = new JButton("Fanta");
btnNewButton.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) {
        changeD();
    }

});

尝试在多个按钮上调用一个方法，但只有一个按钮使用该方法

1 个答案: