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Java Date Time - LocalDate.query() Examples

Java Date Time Java Java API 

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Class:

java.time.LocalDate

java.lang.Objectjava.lang.Objectjava.time.LocalDatejava.time.LocalDatejava.time.temporal.TemporalTemporaljava.time.temporal.TemporalAdjusterTemporalAdjusterjava.time.chrono.ChronoLocalDateChronoLocalDatejava.io.SerializableSerializableLogicBig

Method:

public <R> R query(TemporalQuery<R> query)

This method queries this local date using the provided query object.


Examples


package com.logicbig.example.localdate;

import java.time.LocalDate;
import java.time.LocalTime;
import java.time.temporal.TemporalQueries;
import java.time.temporal.TemporalUnit;

public class QueryExample {

    public static void main (String... args) {
        LocalDate d = LocalDate.of(2004, 11, 14);
        TemporalUnit p = d.query(TemporalQueries.precision());
        System.out.println(p);

        LocalTime t = d.query(TemporalQueries.localTime());
        System.out.println(t);
    }
}

Output

Days
null




This example finds out coming labor day date for the provided local date. It uses a custom TemporalQuery. 

package com.logicbig.example.localdate;

import java.time.DayOfWeek;
import java.time.LocalDate;
import java.time.Month;
import java.time.temporal.TemporalAccessor;
import java.time.temporal.TemporalAdjusters;
import java.time.temporal.TemporalQuery;

public class QueryExample2 {

    public static void main (String... args) {
        LocalDate d = LocalDate.of(2017, 9, 1);
        LocalDate nextLaborDay = d.query(LaborDayQuery);
        System.out.println(nextLaborDay);

        d = LocalDate.of(2017, 9, 4);
        nextLaborDay = d.query(LaborDayQuery);
        System.out.println(nextLaborDay);

        d = LocalDate.of(2017, 9, 5);
        nextLaborDay = d.query(LaborDayQuery);
        System.out.println(nextLaborDay);
    }

    private static final TemporalQuery<LocalDate> LaborDayQuery =
              new TemporalQuery<LocalDate>() {

                  private LocalDate getFirstMondayOfSeptember (LocalDate d) {
                      LocalDate september = d.withMonth(Month.SEPTEMBER
                                                                  .getValue());
                      return september.with(TemporalAdjusters.firstInMonth(
                                DayOfWeek.MONDAY));
                  }

                  @Override
                  public LocalDate queryFrom (TemporalAccessor temporal) {
                      LocalDate d = LocalDate.from(temporal);
                      LocalDate d2 = getFirstMondayOfSeptember(d);
                      if (d.isAfter(d2)) {
                          d2 = getFirstMondayOfSeptember(d2.plusYears(1));
                      }
                      return d2;
                  }
              };
}

Output

2017-09-04
2017-09-04
2018-09-03

See Also