获取秋千标签文本并将其传递给父类

Question

我有一个带有 swing gui 的程序来订购某些产品。处理订单的类有一个，JFrame有JPanel一个JButton。按下该按钮时，我需要处理订单的类中的输入。但是无法弄清楚如何一直获得该输入。

包含按钮的面板：

public class PayPanel extends JPanel {

    private double paidAmount;

    private JButton payButton;

    public PayPanel() {

        setBorder(BorderFactory.createTitledBorder("Make Payment"));

        JLabel payLabel = new JLabel("Pay with: ");

        JTextField payField = new JTextField(12);

        this.payButton = new JButton("Pay");

        this.payButton.setPreferredSize(new Dimension(100, 20));

        this.payButton.addActionListener(new ActionListener() {

            public double paidAmount;

            public void actionPerformed(ActionEvent e) {

                this.paidAmount = Double.parseDouble(payField.getText());

            }

            public double getPaidAmount() {

                return this.paidAmount;

            }

        });

        setLayout(new GridBagLayout());

        GridBagConstraints gridBagConstraints = new GridBagConstraints();

        gridBagConstraints.gridx = 0;

        gridBagConstraints.gridy = 1;

        add(payLabel, gridBagConstraints);

        gridBagConstraints.gridx = 1;

        gridBagConstraints.gridy = 1;

        add(payField, gridBagConstraints);

        gridBagConstraints.weighty = 10;

        gridBagConstraints.gridx = 2;

        gridBagConstraints.gridy = 1;

        add(payButton, gridBagConstraints);

    }

    public double getPaidAmount() {

        ActionListener[] payButtonListeners = this.payButton.getActionListeners();

        ActionListener payButtonActionListener = payButtonListeners[0];

        return payButtonActionListener.getPaidAmount(); // this function is not recognized even though i defined it in the action listener like shown above in the contructor. 

    }

我paidAmount在ActionListener声明中添加了变量，这样我就可以ActionListener从付款按钮中获取，然后调用该getPaidAmount()函数。但是当我ActionListener从中获取payButton.getActionListeners()然后调用我声明的函数时，java 无法识别该getPaidAmount()函数。

我的问题是，我如何获取它paidAmount并将其从按钮传输到面板，然后从面板传输到框架，再从框架传输到拥有框架的类？

Answer 1

尝试将函数放在 actionListener 之外并放在类中PayPanel    public double getPaidAmount() {                 return this.paidAmount;     }并使用payPanelObject.getPaidAmount()