Question

我有以下代码。我想将变量dateStore存储在另一个String类型的变量中。我已经彻底搜索了网络但没有找到任何内容，所以我希望你们可以提供帮助！我该怎么做呢？

public String orderTime(){
    String dateStore = "";
    String time = "";
    if(!out){
        GregorianCalendar orderDay = new GregorianCalendar();
        SimpleDateFormat sdf = new SimpleDateFormat("EEEE, dd/MM/yyyy");
        SimpleDateFormat timeFormat = new SimpleDateFormat("HH:mm:ss");
        timeFormat.setTimeZone(TimeZone.getTimeZone("GMT+1"));
        time = timeFormat.format(new Date());
        System.out.println (); 
        dateStore = sdf.format(orderDay.getTime());
    } 
    return "Date of Order: " + dateStore +
    "Time of Order: " + time +
    "=============================================";
}

基本上，我正在做订单计划。它通过使用orderTime()方法显示订单的时间。现在，我想在特定日期显示所有订单，所以我认为我必须将dateStore变量存储到另一个变量，以便我可以在另一个方法中将其用于将其插入Vector中以便以后进行比较上。对不起，如果这不清楚，我想尽力解释。

Answer 1

如果我理解您的问题，请修改您的方法（或添加其他方法）以返回dateStore。像

这样的东西

public String orderDate(){
    if(!out){
        GregorianCalendar orderDay = new GregorianCalendar();
        SimpleDateFormat sdf = new SimpleDateFormat("EEEE, dd/MM/yyyy");
        return sdf.format(orderDay.getTime());
    } 
    return "";
}

如果您想将日期和时间作为一个整体返回，那么我建议您创建POJO之类的

public class DateAndTime {
  final String date;
  final String time;
  public DateAndTime(String date, String time) {
    this.date = date;
    this.time = time;
  }
  @Override
  public String toString() {
    return "Date of Order: " + date +
      "Time of Order: " + time +
      "=============================================";
  }
}

然后从您的方法返回DateAndTime实例，如

public DateAndTime orderTime(){
    String dateStore = "";
    String time = "";
    if(!out){
        GregorianCalendar orderDay = new GregorianCalendar();
        SimpleDateFormat sdf = new SimpleDateFormat("EEEE, dd/MM/yyyy");
        SimpleDateFormat timeFormat = new SimpleDateFormat("HH:mm:ss");
        timeFormat.setTimeZone(TimeZone.getTimeZone("GMT+1"));
        time = timeFormat.format(new Date());
        // System.out.println (); 
        dateStore = sdf.format(orderDay.getTime());
    } 
    return new DateAndTime(dateStore, time);
}

因为POJO会覆盖toString()，您可以打印它并获取原始输出字符串。

Answer 2

public String[] orderTime(){
    String dateStore = "";
    String time = "";
    if(!out){
        GregorianCalendar orderDay = new GregorianCalendar();
        SimpleDateFormat sdf = new SimpleDateFormat("EEEE, dd/MM/yyyy");
        SimpleDateFormat timeFormat = new SimpleDateFormat("HH:mm:ss");
        timeFormat.setTimeZone(TimeZone.getTimeZone("GMT+1"));
        time = timeFormat.format(new Date());
        System.out.println (); 
        dateStore = sdf.format(orderDay.getTime());
    } 
    String[] aReturn = new String[2];
    aReturn[0] = "Date of Order: " + dateStore;
    aReturn[1] = "Time of Order: " + time;
    return aReturn;
}

然后你可以分别访问这两个字符串值。

Answer 3

您正在使用面向对象的语言 - 它使得做对象事情变得非常容易。你只需要制作物品并告诉他们该做什么。

public class Order {
    // Only create the formatters once.
    static final SimpleDateFormat sdf = new SimpleDateFormat("EEEE, dd/MM/yyyy");
    static final SimpleDateFormat timeFormat = new SimpleDateFormat("HH:mm:ss");

    static {
        timeFormat.setTimeZone(TimeZone.getTimeZone("GMT+1"));
    }
    // Grab the current date/time at creation time.
    final GregorianCalendar orderDay = new GregorianCalendar();
    final Date time = new Date();

    // What was the date of the order.
    public String getDate() {
        return sdf.format(orderDay);
    }

    // What was the time of the oorder.
    public String getTime() {
        return timeFormat.format(time);
    }

    @Override
    public String toString() {
        // A nice representation of the Order.
        return "Date of Order: " + getDate()
                + "Time of Order: " + getTime()
                + "=============================================";
    }
}

public Order newOrder() {
    return new Order();
}

Answer 4

+1 OldCurmudgeon

您只需要将orderDay变量声明为您的类的成员

public class Order {
private GregorianCalendar orderDay;
...

更改行

GregorianCalendar orderDay = new GregorianCalendar();

通过

this.orderDay = new GregorianCalendar();

并添加此内容。在每个orderDay之前

在时间和时间做同样的事情在创建getter以获取不同格式的值

之后

public GregorianCalendar get_orderDay() {
   Return this.orderDay;
}

Answer 5

我们可以对这些方法做很多改进，但是关注你的问题，你可以使用输出参数，它更容易阅读和不准备。

public String orderTime(String out dateStore){
    dateStore = "";

如何只存储一部分return语句

5 个答案: