java - SimpleDateFormat不更新时间

Question

我试图创建一个类(DateTime)，在其中收集与格式化时间、等待等相关的所有方法。当我尝试使用 SimpleDateFormat 时，它会不断返回(初始化)时间，而不是每次调用方法时的新时间。

public class DateTime {
    static String logtimeformat = DateTime.formatCurrentDate("HH:mm:ss  ");
    static String filenametimeformat = DateTime.formatCurrentDate("dd-MM-yyyy_HH-mm-ss");
    static String picturenameformat = DateTime.formatCurrentDate("dd-MM-yyyy_HH-mm-ss-SSS");

    public static String formatLogTime() {
        String formated = DateTime.formatCurrentDate(logtimeformat);
        return formated;
    }

    public static String formatPicName() {
        String formated = DateTime.formatCurrentDate(picturenameformat);
        return formated;
    }

    public static String formatCurrentDate (String format) {
        SimpleDateFormat dateformat = new SimpleDateFormat(format);
        String formateddate = dateformat.format(new Date());
        return formateddate;
    }
}

我在哪里调用它

public class Screenshot {
    static Integer n = 1;
    public static void take() {
        WebDriver driver = WebDriverFactory.getInstance();
        TakesScreenshot scrShot =((TakesScreenshot)driver);
        File srcFile=scrShot.getScreenshotAs(OutputType.FILE);
        File destFile=null;
        n++;
        try {
            destFile=new File("/Users/me/Desktop/folder bez nazwy/"+DateTime.formatPicName()+".jpg");
            FileHandler.copy(srcFile, destFile);
            String destfilestr = destFile.getAbsolutePath();
            System.out.println("Created screenshot at: "+destfilestr);
        } catch (IOException e) {
            System.out.println("Something went wrong with copying file at destination. Kindly check Screenshot -> take method");
            e.printStackTrace();
        }
    }
}

我希望每次调用时输出都是当前时间日期时间.formatLogTime日期时间.formatPicName

同时，每次我启动它时，它都会显示初始化时间

Answer 1

您的格式字符串不正确。更改此:

static String logtimeformat = DateTime.formatCurrentDate("HH:mm:ss  ");
static String filenametimeformat = DateTime.formatCurrentDate("dd-MM-yyyy_HH-mm-ss");
static String picturenameformat = DateTime.formatCurrentDate("dd-MM-yyyy_HH-mm-ss-SSS");

对此:

static String logtimeformat = "HH:mm:ss";
static String filenametimeformat = "dd-MM-yyyy_HH-mm-ss";
static String picturenameformat = "dd-MM-yyyy_HH-mm-ss-SSS";