格式化Java字符串时间格式化

Question

有没有办法不用if ( hours > 0 )就可以做到这一点？我觉得必须有一种方法来指示数字的条件显示，但我在javadocs或google中找不到它

public String getLengthDisplay () {
    int hours = getLength() / 3600;
    int minutes = ( getLength() % 3600 ) / 60;
    int seconds = getLength() % 60;

    if ( hours > 0 ) {
        return String.format ( "%d:%02d:%02d", hours, minutes, seconds );
    } else {
        return String.format ( "%d:%02d", minutes, seconds );
    }
}

谢谢

Answer 1

无法使用format()，只需修剪前导零：

return String.format("%d:%02d:%02d", hours, minutes, seconds)
    .replaceAll("^0:(00:)?", "");

如果小时和分钟均为零，则此代码还会对分钟进行微调。如果你总是想要会议记录，请从这段代码中删除(00:)?

Answer 2

我认为没有时间，代码不会灵活>；0条件。 修剪也是一个不错的选择

/**
* This method is used to get the Execution Time
* by calculating the difference between StartTime and EndTime
* 
* @param StartTime Execution Start Time
* @param EndTime Execution End Time
* @return Total Execution Time
*/
 private static String ExecutionTime(String StartTime, String EndTime){

   LocalTime fromDateTime = LocalTime.parse(StartTime);
   LocalTime toDateTime = LocalTime.parse(EndTime);

   LocalTime tempDateTime = LocalTime.from( fromDateTime );

   long hours = tempDateTime.until( toDateTime, ChronoUnit.HOURS);
   tempDateTime = tempDateTime.plusHours( hours );

   long minutes = tempDateTime.until( toDateTime, ChronoUnit.MINUTES);
   tempDateTime = tempDateTime.plusMinutes( minutes );

   long seconds = tempDateTime.until( toDateTime, ChronoUnit.SECONDS);


   if(hours > 0){
       return hours + "h " +minutes + "min " + seconds + "s";
   }else{
       return minutes + "min " + seconds + "s";
   }

}

检查上面的代码，返回小时-分钟-秒格式，如果需要，也可以添加分钟条件