Question

我需要将标准时间转换为传统时间。

Answer 1

使用SimpleDateFormat的解决方案

    private  static String  convertTimes(String stdTime) throws ParseException{
    SimpleDateFormat stdF = new SimpleDateFormat("HH:mm:ss");
    SimpleDateFormat tF = new SimpleDateFormat("hh:mm a");
    return tF.format(stdF.parse(stdTime));  
}

Answer 2

查看DateFormat，更具体地说SimpleDateFormat。您可以使用它们来解析字符串中的日期（包括时间）并将它们转换回另一种格式。

有很多例子如何使用它，for example on how to convert date strings。您应该能够轻松地将它们用于您的用例。

Answer 3

JB Nizet手动敲击头部 - 这是解释他的想法的代码。

public static void printTime(String time){

    String[] time_split = time.split(":");

    int hour = Integer.parseInt(time_split[0]);
    int minute = Integer.parseInt(time_split[1]);

    String am_pm;

    if(hour>=12)
        am_pm = "PM";
    else
        am_pm = "AM";
    if(hour > 12)
        hour -= 12;
    if(hour == 0)
        hour = 12;

    System.out.printf("%d:%d%s\n",hour,minute,am_pm);
}

输出：

上午12时35分

Answer 4

非常感谢任何帮助

让您的生活更轻松，并使用一个好的日期时间库来完成工作。避免捆绑的java.util.Date/Calendar类。使用：

Joda-Time
Java 8中捆绑的新java.time。*（JSR 310）类。

以下是Joda-Time 2.3中的示例代码。

// © 2013 Basil Bourque. This source code may be used freely forever by anyone taking full responsibility for doing so.
// import org.joda.time.*;
// import org.joda.time.format.*;

String timeString_24Hour = "14:35:22";

// From String to LocalTime object
DateTimeFormatter formatter_24HourTime = DateTimeFormat.forPattern("HH:mm:ss");
LocalTime localTime = formatter_24HourTime.parseLocalTime( timeString_24Hour );

// From LocalTime object to String
DateTimeFormatter formatter_12HourTime = DateTimeFormat.forPattern("h:mm:ss aa");
String timeString_12Hour = formatter_12HourTime.print( localTime );

转储到控制台...

System.out.println( "timeString_24Hour: " + timeString_24Hour );
System.out.println( "localTime: " + localTime.toString() );
System.out.println( "timeString_12Hour: " + timeString_12Hour );

跑步时......

timeString_24Hour: 14:35:22
localTime: 14:35:22.000
timeString_12Hour: 2:35:22 PM

Answer 5

我更改convertToTraditional（）方法以使您的代码正常工作。

static String amPM;// will hold am/pm for standard time
static String traditionalTime;// will store traditional time from user
static int mins1, mins2, hours;// will store hours and minutes

public static void main(String args[]) throws IOException {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));// user
                                                                                // input

    int tryAgain = 1;// will initial do-while loop
    System.out.println("Standard Time to Traditional Time Converter");
    System.out.println("===========================================");
    do {
        System.out.println();
        System.out.println("Input a time in Standard Form (HH:MM:SS):");
        String standardTime = br.readLine();// user inputs time in standard
                                            // form
        System.out.println();

        do {
            if ((standardTime.length()) != 8) {
                System.out.println("Invalid time entered.");
                System.out
                        .println("Input a time in Standard Form that has this form HH:MM:SS ...");
                standardTime = br.readLine();// user inputs time in standard
                                                // form
                System.out.println();
            }
        } while ((standardTime.length()) != 8);

        convertToTraditional(standardTime);
//          if (hours >= 12) {
//              System.out.println(standardTime + " is equivalent to "
//                      + traditionalTime + " PM");
//          }
//          if (hours < 12) {
//              System.out.println(standardTime + " is equivalent to "
//                      + traditionalTime + " AM");
//          }
        System.out.println(standardTime + " is equivalent to "
                + traditionalTime);

        System.out.println();
        System.out.println("Enter 1 to try again.");
        tryAgain = Integer.parseInt(br.readLine());// user decides to try
                                                    // again
    } while (tryAgain == 1);// will repeat if user enters 1

}// closes main body

public static void convertToTraditional(String standardTime) {
    String strHours = standardTime.substring(0, 2);                         // "13"
    String strMin = standardTime.substring(3, 5);           
    hours=Integer.parseInt(strHours);
    if(hours>12)
    {

        hours=hours-12;
        traditionalTime=Integer.toString(hours)+":"+strMin+" PM";
    } else
    {

        traditionalTime=strHours+":"+strMin+" AM";
    }



}

将标准时间转换为传统时间

5 个答案: