如何在Java中将字符串转换为日历对象

Question

I have the below string which is input to my method String xymessage="Your item(s) will be ready Today for pickup by 10:00 am ";

Now how can i convert this string to a calendar object.

I was able to extract the day ie. whether its "today" or "tomorrow". And also the time ie. "10:00 am" using these two parameters as input ie. today and 10:00 am will it be possible for me to convert it to a calendar object? Sample code snippet:

String xymessage="Your item(s) will be ready Today for pickup by 10:00 a.m.        ";
if(null != xyMessage){
    //removing empty spaces.
    xyMessage=xyMessage.trim();
    LOGGER.debug("sellerId:"+delivSeller.getSellerId()+" and xymessage:"+xyMessage);
    if(xyMessage.contains("Today")){
        //this means its today
        String[] xyArray = xyMessage.split("pickup by");
        if(xyArray.length == 2){
            String timeVal=xyArray[1];
        }
    }else{
        //this means its tomorrow
    }  
}

Answer 1

Use Calendar cal = Calendar.getInstance() to get a calendar object with the current date and time. Using the add() , get() , and set() methods, you can set the calendar object correctly. For instance, to change the date to tomorrow's, you could do: cal.add(Calendar.DAY_OF_MONTH, 1);

To set the hour, cal.set(Calendar.HOUR, hr); where hr was initialized with the hour to be set. Similarly for minutes, etc.

Answer 2

You can use SimpleDateFormat for the format you want. But as you are having am or pm instead of plain simple AM/PM, it makes a bit of complication. Check the below code if it helps for "today" condition : Here variable 'time' is what you have extracted like "10:00 am"

    SimpleDateFormat sdf = new SimpleDateFormat("HH:mm");
    Date date = new Date();
    String timeArray[]=time.split(" ");
    String minArray[]=timeArray[0].split(":");
    date.setHours(Integer.parseInt(minArray[0]));
    date.setMinutes(Integer.parseInt(minArray[1]));
    if(!timeArray[1].startsWith("a")){
        date.setHours(date.getHours()+12);
    }
    Calendar cal = Calendar.getInstance();
    cal.setTime(date);

Answer 3

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
/**
 *
 * @author Administrator
 */
public class Test {

  public static void main(String[] args) throws ParseException {
    SimpleDateFormat sdf = new SimpleDateFormat("hh:mm aa");
    SimpleDateFormat finalFormat = new SimpleDateFormat("yyyy-MM-dd hh:mm aa");
    Calendar today = Calendar.getInstance();
    Calendar tomorrow = Calendar.getInstance();
    tomorrow.add(Calendar.DATE, 1);

    String xyMessage = "Your item(s) will be ready Today for pickup by 10:00 a.m.        ";
    if (null != xyMessage) {
      //removing empty spaces.
      xyMessage = xyMessage.trim();
      if (xyMessage.contains("Today")) {
        //this means its today
        String[] xyArray = xyMessage.split("pickup by ");
        String time = xyArray[1].replace(".", "");

        today.set(Calendar.HOUR_OF_DAY, sdf.parse(time).getHours());
        System.out.println("calendar:" + finalFormat.format(today.getTime()));

      } else {
        //this means its tomorrow
        String[] xyArray = xyMessage.split("pickup by ");
        String time = xyArray[1].replace(".", "");

        tomorrow.set(Calendar.HOUR_OF_DAY, sdf.parse(time).getHours());
        System.out.println("calendar:" + finalFormat.format(tomorrow.getTime()));
      }
    }
  }
}

just use SimpleDateFormat("hh:mm aa")

Answer 4

Try below code.

    String val = "10:00 a.m";
    val = val.replace(".", "");

    SimpleDateFormat dateFormat = new SimpleDateFormat("hh:mm a");
    Calendar temp = Calendar.getInstance();
    temp.setTime(dateFormat.parse(val));

    Calendar cal = Calendar.getInstance();

    if ("tomorrow".equalsIgnoreCase("YOUR_STRING")) {
        cal.add(Calendar.DAY_OF_YEAR, 1);
    }

    cal.set(Calendar.HOUR_OF_DAY, temp.get(Calendar.HOUR_OF_DAY));
    cal.set(Calendar.MINUTE, temp.get(Calendar.MINUTE));

    System.out.println(cal.get(Calendar.DAY_OF_MONTH) + ":"
            + (cal.get(Calendar.MONTH) + 1) + ":"
            + cal.get(Calendar.HOUR_OF_DAY) + ":"
            + cal.get(Calendar.MINUTE));
}