Java 使用查询方法在LocalDate上查询日期

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import static java.time.DayOfWeek.FRIDAY;//来 自 nowjava - 时  代  Java

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import static java.time.temporal.ChronoField.DAY_OF_MONTH;

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import static java.time.temporal.ChronoField.DAY_OF_WEEK;

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import java.time.DayOfWeek;

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import java.time.LocalDate;

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import java.time.LocalTime;

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import java.time.temporal.TemporalAccessor;

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public class Main {

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  public static void main(String[] args) {

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    LocalDate ld1 = LocalDate.of(2013, 12, 13);

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    Boolean isFriday13 = ld1.query(Main::isFriday13);

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    System.out.println("Date: " + ld1 + ", isFriday13: " + isFriday13);

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    LocalDate ld2 = LocalDate.of(2017, 1, 10);

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    isFriday13 = ld2.query(Main::isFriday13);

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    System.out.println("Date: " + ld2 + ", isFriday13: " + isFriday13);

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    /**

     from

    * 时代Java公众号 - nowjava.com 

    **/

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    LocalTime lt = LocalTime.of(7, 30, 45);

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    isFriday13 = lt.query(Main::isFriday13);

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    System.out.println("Time: " + lt + ", isFriday13: " + isFriday13);

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  }

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  public static Boolean isFriday13(TemporalAccessor temporal) {

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    if (temporal.isSupported(DAY_OF_MONTH) && temporal.isSupported(DAY_OF_WEEK)) {

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      int dayOfMonth = temporal.get(DAY_OF_MONTH);

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