需要使用按钮单击时从文本字段捕获的信息更新数组列表中的对象

Question

我正在编写一个可用于输入交通票的小程序（教育目的）主页上有三个简单选项新票，它接收所有信息以创建新的票对象并添加到列表中。截至目前，该部分工作正常。

我遇到的问题是我的支付票选项，用户输入票号和他们希望在票上支付的金额，点击支付票按钮后，程序应编辑精细实例变量。付款金额。

我尝试过编写几种方法并调用它们，使用各种不同的for循环来比较和执行此函数。

这里有一些我认为相关的代码。

家庭班级（主要班级）

//created the empty list
List<Ticket> links = new ArrayList<Ticket>();

//Populates the ArrayList uppon button click, this portion is working fine as of now
Button btnSave = new JButton("Save");

btnSave.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) {
        //method to add the information to a list or array
        String last = captureLastName.getText();
        String first = captureFirstName.getText();
        String date = captureDate.getText();
        String location = captureLocation.getText();
        String violation = (String) captureViolation.getSelectedItem();
        double fine = process.assignFine(violation);

        // String type
        // String speedOver
        String officerBN = captureOfficerBadgeNumber.getText();
        String ticketN = captureTicketNumber.getText();
        Ticket newTik = new Ticket(last, first, date, location,
                                   violation, officerBN, ticketN, fine);

        links.add(newTik);

        }
});

//Capturing information the user put in upon button click
JButton btnPay = new JButton("Pay Ticket");

btnPay.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent arg0) {
        //assigning the ticket number to variable
        String ticN = captureTickNum.getText();

        //assigning payment amount to variable
        String pmt = capturePaymentAmount.getText();

        //making payment amount a double
        double payAmt = Double.parseDouble(pmt);

        for (int x = 0; x < links.size(); x++) {
            if (links.get(x).getTicketNumber() == ticN) {
                double newFine = (links.get(x).getFine()) - payAmt;
                links.get(x).setFine(newFine);
            }
        }
    }
});