如何在android中比较两次

Calendar calendar1 = Calendar.getInstance();SimpleDateFormat formatter1 = new SimpleDateFormat("dd/M/yyyy h:mm");String currentDate = formatter1.format(calendar1.getTime());final String dateString = cursor.getString(4);final String timeString = cursor.getString(5);String datadb =dateString+" "+timeString;//  Toast.makeText(context,"databse date:-"+datadb+"Current Date :-"+currentDate,Toast.LENGTH_LONG).show();if(currentDate.compareTo(datadb)>=0) {    myCheckBox.setChecked(true);    myCheckBox.setEnabled(false);}