从字符串格式转换后无法打印时间

Question

 // For Date validation
    SimpleDateFormat simpleDateFormat1 = new SimpleDateFormat("dd/MM/yyyy");
    String datechosen = dateText.getText().toString() ;
    Date dateselected = simpleDateFormat1.parse(datechosen);
    System.out.println(dateselected);


    // For Time validation
    SimpleDateFormat simpleDateFormat = new SimpleDateFormat("HH:mm");
    String timechosen = timeText.getText().toString();
    Date timeselected = simpleDateFormat.parse(timechosen);
    Calendar cal = Calendar.getInstance();
    cal.setTime(timeselected);
    cal.add(Calendar.HOUR, noofhourselected);
    cal.add(Calendar.MINUTE,  noofminselected);
    timeselected = cal.getTime();
    System.out.println(timeselected);

我正在努力将我拥有的字符串转换为日期和时间格式。例如，字符串 datechosen 包含“26/10/2020”。我可以将它转换成日期格式并打印出来。

但是对于时间字符串，我无法打印出来。我面临以下错误：

Screenshot of the log message

但是如果我反过来交换代码的位置，

  SimpleDateFormat simpleDateFormat = new SimpleDateFormat("HH:mm");
    String timechosen = timeText.getText().toString();
    Date timeselected = simpleDateFormat.parse(timechosen);
    Calendar cal = Calendar.getInstance();
    cal.setTime(timeselected);
    cal.add(Calendar.HOUR, noofhourselected);
    cal.add(Calendar.MINUTE,  noofminselected);
    timeselected = cal.getTime();
    System.out.println(timeselected);

    // For Date validation
    SimpleDateFormat simpleDateFormat1 = new SimpleDateFormat("dd/MM/yyyy");
    String datechosen = dateText.getText().toString() ;
    Date dateselected = simpleDateFormat1.parse(datechosen);
    System.out.println(dateselected);

将改为打印时间

这是两个输入字段

Answer 1

您为时间设置的日期格式有误。对于 cal.setTime(timeselected); setTime 需要 Date Refer java doc

使用与日期相同的格式。

从字符串格式转换后无法打印时间

Could not print time after conversion from string format

android

simpledateformat