如何更新 Java 中數組列表中對象的特定屬性？

Question

我有一個為學校項目制作的系統，包括客戶、約會等。我只是在努力弄清楚如何更新我為每個客戶設置的 LocalDateTime 約會變量，我知道如何制作有一個新客戶，但不知道如何更新它。

ArrayList<Client> clients = Client.inputClientsFromFile();

LocalDateTime tempappointment;
int yearint = Integer.parseInt(year.getText());
int monthint = Integer.parseInt(month.getText());
int dayint = Integer.parseInt(day.getText());
int hourint = Integer.parseInt(hour.getText());
int minuteint = Integer.parseInt(minutes.getText());
tempappointment = LocalDateTime.of(yearint,monthint,dayint,hourint,minuteint);

我寫這個是為了從文本框和這個獲取本地日期時間

public LocalDateTime getAppointment() {
        return nextappointment;
    }

    /**
     * @param nextappointment
     */
    public void setAppointment(LocalDateTime nextappointment) {
        this.nextappointment = nextappointment;

在 arraylist 中初始化客戶端對象時。

Answer 1

您需要調用Client.setAppointment

對於特定客戶：

LocalDateTime tempappointment = LocalDateTime.of(yearint, monthint, dayint, hourint, minuteint);
clients.get(0).setAppointment(tempappointment);

對所有人

for (Client client : clients) {
    client.setAppointment(tempappointment);
}