详解Java中Duration类的使用方法

Duration fromDays = Duration.ofDays( 1 );

LocalDateTime start = LocalDateTime.of( 2022 , 1 , 1 , 8 , 0 , 0 );

LocalDateTime end = LocalDateTime.of( 2022 , 1 , 2 , 8 , 30 , 30 );

Duration duration = Duration.between(start, end);

Duration du1 = Duration.ofHours( 10 );

Duration duration = Duration.from(du1);

Duration fromChar1 = Duration.parse( "P1DT1H10M10.5S" );

Duration fromChar2 = Duration.parse( "PT10M" );

public final class Duration

         implements TemporalAmount, Comparable<Duration>, Serializable {

     //其他代码

     //-----------------------------------------------------------------------

     /**

      * Obtains a {@code Duration} from a text string such as {@code PnDTnHnMn.nS}.

      * <p>

      * This will parse a textual representation of a duration, including the

      * string produced by {@code toString()}. The formats accepted are based

      * on the ISO-8601 duration format {@code PnDTnHnMn.nS} with days

      * considered to be exactly 24 hours.

      * <p>

      * The string starts with an optional sign, denoted by the ASCII negative

      * or positive symbol. If negative, the whole period is negated.

      * The ASCII letter "P" is next in upper or lower case.

      * There are then four sections, each consisting of a number and a suffix.

      * The sections have suffixes in ASCII of "D", "H", "M" and "S" for

      * days, hours, minutes and seconds, accepted in upper or lower case.

      * The suffixes must occur in order. The ASCII letter "T" must occur before

      * the first occurrence, if any, of an hour, minute or second section.

      * At least one of the four sections must be present, and if "T" is present

      * there must be at least one section after the "T".

      * The number part of each section must consist of one or more ASCII digits.

      * The number may be prefixed by the ASCII negative or positive symbol.

      * The number of days, hours and minutes must parse to an {@code long}.

      * The number of seconds must parse to an {@code long} with optional fraction.

      * The decimal point may be either a dot or a comma.

      * The fractional part may have from zero to 9 digits.

      * <p>

      * The leading plus/minus sign, and negative values for other units are

      * not part of the ISO-8601 standard.

      * <p>

      * Examples:

      * <pre>

      *    "PT20.345S" -- parses as "20.345 seconds"

      *    "PT15M"     -- parses as "15 minutes" (where a minute is 60 seconds)

      *    "PT10H"     -- parses as "10 hours" (where an hour is 3600 seconds)

      *    "P2D"       -- parses as "2 days" (where a day is 24 hours or 86400 seconds)

      *    "P2DT3H4M"  -- parses as "2 days, 3 hours and 4 minutes"

      *    "P-6H3M"    -- parses as "-6 hours and +3 minutes"

      *    "-P6H3M"    -- parses as "-6 hours and -3 minutes"

      *    "-P-6H+3M"  -- parses as "+6 hours and -3 minutes"

      * </pre>

      *

      * @param text  the text to parse, not null

      * @return the parsed duration, not null

      * @throws DateTimeParseException if the text cannot be parsed to a duration

      */

     public static Duration parse(CharSequence text) {

         ......

     }

}

Instant start = Instant.parse( "2017-10-03T10:15:30.00Z" );

Instant end = Instant.parse( "2017-10-03T10:16:30.00Z" );

// start - end        

Duration duration = Duration.between(start, end);

// 任何一个时间单元为负数，则返回true。true：end早于start

duration.isNegative();

Duration.between(start, end).getSeconds();

Duration.between(start, end).getNano();

Duration duration = Duration.ofHours( 2 );

Duration newDuration = duration.plusSeconds( 33 );

Duration duration = Duration.ofHours( 2 );

Duration newDuration = duration.plus( 33 , ChronoUnit.SECONDS);

Duration duration = Duration.ofHours( 2 );

duration.toDays();     // 0

duration.toHours();    // 2

duration.toMinutes();  // 120

duration.toMillis();   // 7200000

duration.toNanos();    // 7200000000000

Duration duration = Duration.ofHours( 2 );

duration.getSeconds();  //7200

duration.getNano();     //