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   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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   * This code is free software; you can redistribute it and/or modify it
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   * particular file as subject to the "Classpath" exception as provided
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   *
   * This code is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   * version 2 for more details (a copy is included in the LICENSE file that
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   *
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  /*
   * This file is available under and governed by the GNU General Public
   * License version 2 only, as published by the Free Software Foundation.
   * However, the following notice accompanied the original version of this
   * file:
   *
   * Copyright (c) 2007-2012, Stephen Colebourne & Michael Nascimento Santos
   *
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *
   *  * Redistributions of source code must retain the above copyright notice,
   *    this list of conditions and the following disclaimer.
   *
   *  * Redistributions in binary form must reproduce the above copyright notice,
   *    this list of conditions and the following disclaimer in the documentation
   *    and/or other materials provided with the distribution.
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   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
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   * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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  package java.time;
  
  import static java.time.temporal.ChronoField.DAY_OF_MONTH;
  import static java.time.temporal.ChronoField.MONTH_OF_YEAR;
  
  import java.io.DataInput;
  import java.io.DataOutput;
  import java.io.IOException;
  import java.io.InvalidObjectException;
  import java.io.ObjectInputStream;
  import java.io.Serializable;
  import java.time.chrono.Chronology;
  import java.time.chrono.IsoChronology;
  import java.time.format.DateTimeFormatter;
  import java.time.format.DateTimeFormatterBuilder;
  import java.time.format.DateTimeParseException;
  import java.time.temporal.ChronoField;
  import java.time.temporal.Temporal;
  import java.time.temporal.TemporalAccessor;
  import java.time.temporal.TemporalAdjuster;
  import java.time.temporal.TemporalField;
  import java.time.temporal.TemporalQueries;
  import java.time.temporal.TemporalQuery;
  import java.time.temporal.UnsupportedTemporalTypeException;
  import java.time.temporal.ValueRange;
  import java.util.Objects;
  
  // Android-changed: removed ValueBased paragraph.
  
  /**
   * A month-day in the ISO-8601 calendar system, such as {@code --12-03}.
   * <p>
   * {@code MonthDay} is an immutable date-time object that represents the combination
   * of a month and day-of-month. Any field that can be derived from a month and day,
   * such as quarter-of-year, can be obtained.
   * <p>
   * This class does not store or represent a year, time or time-zone.
   * For example, the value "December 3rd" can be stored in a {@code MonthDay}.
   * <p>
   * Since a {@code MonthDay} does not possess a year, the leap day of
   * February 29th is considered valid.
   * <p>
   * This class implements {@link TemporalAccessor} rather than {@link Temporal}.
   * This is because it is not possible to define whether February 29th is valid or not
   * without external information, preventing the implementation of plus/minus.
   * Related to this, {@code MonthDay} only provides access to query and set the fields
   * {@code MONTH_OF_YEAR} and {@code DAY_OF_MONTH}.
   * <p>
   * The ISO-8601 calendar system is the modern civil calendar system used today
   * in most of the world. It is equivalent to the proleptic Gregorian calendar
   * system, in which today's rules for leap years are applied for all time.
   * For most applications written today, the ISO-8601 rules are entirely suitable.
   * However, any application that makes use of historical dates, and requires them
   * to be accurate will find the ISO-8601 approach unsuitable.
   *
   * @implSpec
   * This class is immutable and thread-safe.
   *
   * @since 1.8
   */
  public final class MonthDay
          implements TemporalAccessor, TemporalAdjuster, Comparable<MonthDay>, Serializable {
  
      /**
       * Serialization version.
       */
      private static final long serialVersionUID = -939150713474957432L;
      /**
       * Parser.
       */
      private static final DateTimeFormatter PARSER = new DateTimeFormatterBuilder()
          .appendLiteral("--")
          .appendValue(MONTH_OF_YEAR, 2)
          .appendLiteral('-')
          .appendValue(DAY_OF_MONTH, 2)
          .toFormatter();
  
      /**
       * The month-of-year, not null.
       */
      private final int month;
      /**
       * The day-of-month.
       */
      private final int day;
  
      //-----------------------------------------------------------------------
      /**
       * Obtains the current month-day from the system clock in the default time-zone.
       * <p>
       * This will query the {@link Clock#systemDefaultZone() system clock} in the default
       * time-zone to obtain the current month-day.
       * <p>
       * Using this method will prevent the ability to use an alternate clock for testing
       * because the clock is hard-coded.
       *
       * @return the current month-day using the system clock and default time-zone, not null
       */
      public static MonthDay now() {
          return now(Clock.systemDefaultZone());
      }
  
      /**
       * Obtains the current month-day from the system clock in the specified time-zone.
       * <p>
       * This will query the {@link Clock#system(ZoneId) system clock} to obtain the current month-day.
       * Specifying the time-zone avoids dependence on the default time-zone.
       * <p>
       * Using this method will prevent the ability to use an alternate clock for testing
       * because the clock is hard-coded.
       *
       * @param zone  the zone ID to use, not null
       * @return the current month-day using the system clock, not null
       */
      public static MonthDay now(ZoneId zone) {
          return now(Clock.system(zone));
      }
  
      /**
       * Obtains the current month-day from the specified clock.
       * <p>
       * This will query the specified clock to obtain the current month-day.
       * Using this method allows the use of an alternate clock for testing.
       * The alternate clock may be introduced using {@link Clock dependency injection}.
       *
       * @param clock  the clock to use, not null
       * @return the current month-day, not null
       */
      public static MonthDay now(Clock clock) {
          final LocalDate now = LocalDate.now(clock);  // called once
          return MonthDay.of(now.getMonth(), now.getDayOfMonth());
      }
  
      //-----------------------------------------------------------------------
      /**
       * Obtains an instance of {@code MonthDay}.
       * <p>
       * The day-of-month must be valid for the month within a leap year.
       * Hence, for February, day 29 is valid.
       * <p>
       * For example, passing in April and day 31 will throw an exception, as
       * there can never be April 31st in any year. By contrast, passing in
       * February 29th is permitted, as that month-day can sometimes be valid.
       *
       * @param month  the month-of-year to represent, not null
       * @param dayOfMonth  the day-of-month to represent, from 1 to 31
       * @return the month-day, not null
       * @throws DateTimeException if the value of any field is out of range,
       *  or if the day-of-month is invalid for the month
       */
      public static MonthDay of(Month month, int dayOfMonth) {
          Objects.requireNonNull(month, "month");
          DAY_OF_MONTH.checkValidValue(dayOfMonth);
          if (dayOfMonth > month.maxLength()) {
              throw new DateTimeException("Illegal value for DayOfMonth field, value " + dayOfMonth +
                      " is not valid for month " + month.name());
          }
          return new MonthDay(month.getValue(), dayOfMonth);
      }
  
      /**
       * Obtains an instance of {@code MonthDay}.
       * <p>
       * The day-of-month must be valid for the month within a leap year.
       * Hence, for month 2 (February), day 29 is valid.
       * <p>
       * For example, passing in month 4 (April) and day 31 will throw an exception, as
       * there can never be April 31st in any year. By contrast, passing in
       * February 29th is permitted, as that month-day can sometimes be valid.
       *
       * @param month  the month-of-year to represent, from 1 (January) to 12 (December)
       * @param dayOfMonth  the day-of-month to represent, from 1 to 31
       * @return the month-day, not null
       * @throws DateTimeException if the value of any field is out of range,
       *  or if the day-of-month is invalid for the month
       */
      public static MonthDay of(int month, int dayOfMonth) {
          return of(Month.of(month), dayOfMonth);
      }
  
      //-----------------------------------------------------------------------
      /**
       * Obtains an instance of {@code MonthDay} from a temporal object.
       * <p>
       * This obtains a month-day based on the specified temporal.
       * A {@code TemporalAccessor} represents an arbitrary set of date and time information,
       * which this factory converts to an instance of {@code MonthDay}.
       * <p>
       * The conversion extracts the {@link ChronoField#MONTH_OF_YEAR MONTH_OF_YEAR} and
       * {@link ChronoField#DAY_OF_MONTH DAY_OF_MONTH} fields.
       * The extraction is only permitted if the temporal object has an ISO
       * chronology, or can be converted to a {@code LocalDate}.
       * <p>
       * This method matches the signature of the functional interface {@link TemporalQuery}
       * allowing it to be used as a query via method reference, {@code MonthDay::from}.
       *
       * @param temporal  the temporal object to convert, not null
       * @return the month-day, not null
       * @throws DateTimeException if unable to convert to a {@code MonthDay}
       */
      public static MonthDay from(TemporalAccessor temporal) {
          if (temporal instanceof MonthDay) {
              return (MonthDay) temporal;
          }
          try {
              if (IsoChronology.INSTANCE.equals(Chronology.from(temporal)) == false) {
                  temporal = LocalDate.from(temporal);
              }
              return of(temporal.get(MONTH_OF_YEAR), temporal.get(DAY_OF_MONTH));
          } catch (DateTimeException ex) {
              throw new DateTimeException("Unable to obtain MonthDay from TemporalAccessor: " +
                      temporal + " of type " + temporal.getClass().getName(), ex);
          }
      }
  
      //-----------------------------------------------------------------------
      /**
       * Obtains an instance of {@code MonthDay} from a text string such as {@code --12-03}.
       * <p>
       * The string must represent a valid month-day.
       * The format is {@code --MM-dd}.
       *
       * @param text  the text to parse such as "--12-03", not null
       * @return the parsed month-day, not null
       * @throws DateTimeParseException if the text cannot be parsed
       */
      public static MonthDay parse(CharSequence text) {
          return parse(text, PARSER);
      }
  
      /**
       * Obtains an instance of {@code MonthDay} from a text string using a specific formatter.
       * <p>
       * The text is parsed using the formatter, returning a month-day.
       *
       * @param text  the text to parse, not null
       * @param formatter  the formatter to use, not null
       * @return the parsed month-day, not null
       * @throws DateTimeParseException if the text cannot be parsed
       */
      public static MonthDay parse(CharSequence text, DateTimeFormatter formatter) {
          Objects.requireNonNull(formatter, "formatter");
          return formatter.parse(text, MonthDay::from);
      }
  
      //-----------------------------------------------------------------------
      /**
       * Constructor, previously validated.
       *
       * @param month  the month-of-year to represent, validated from 1 to 12
       * @param dayOfMonth  the day-of-month to represent, validated from 1 to 29-31
       */
      private MonthDay(int month, int dayOfMonth) {
          this.month = month;
          this.day = dayOfMonth;
      }
  
      //-----------------------------------------------------------------------
      /**
       * Checks if the specified field is supported.
       * <p>
       * This checks if this month-day can be queried for the specified field.
       * If false, then calling the {@link #range(TemporalField) range} and
       * {@link #get(TemporalField) get} methods will throw an exception.
       * <p>
       * If the field is a {@link ChronoField} then the query is implemented here.
       * The supported fields are:
       * <ul>
       * <li>{@code MONTH_OF_YEAR}
       * <li>{@code YEAR}
       * </ul>
       * All other {@code ChronoField} instances will return false.
       * <p>
       * If the field is not a {@code ChronoField}, then the result of this method
       * is obtained by invoking {@code TemporalField.isSupportedBy(TemporalAccessor)}
       * passing {@code this} as the argument.
       * Whether the field is supported is determined by the field.
       *
       * @param field  the field to check, null returns false
       * @return true if the field is supported on this month-day, false if not
       */
      @Override
      public boolean isSupported(TemporalField field) {
          if (field instanceof ChronoField) {
              return field == MONTH_OF_YEAR || field == DAY_OF_MONTH;
          }
          return field != null && field.isSupportedBy(this);
      }
  
      /**
       * Gets the range of valid values for the specified field.
       * <p>
       * The range object expresses the minimum and maximum valid values for a field.
       * This month-day is used to enhance the accuracy of the returned range.
       * If it is not possible to return the range, because the field is not supported
       * or for some other reason, an exception is thrown.
       * <p>
       * If the field is a {@link ChronoField} then the query is implemented here.
       * The {@link #isSupported(TemporalField) supported fields} will return
       * appropriate range instances.
       * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
       * <p>
       * If the field is not a {@code ChronoField}, then the result of this method
       * is obtained by invoking {@code TemporalField.rangeRefinedBy(TemporalAccessor)}
       * passing {@code this} as the argument.
       * Whether the range can be obtained is determined by the field.
       *
       * @param field  the field to query the range for, not null
       * @return the range of valid values for the field, not null
       * @throws DateTimeException if the range for the field cannot be obtained
       * @throws UnsupportedTemporalTypeException if the field is not supported
       */
      @Override
      public ValueRange range(TemporalField field) {
          if (field == MONTH_OF_YEAR) {
              return field.range();
          } else if (field == DAY_OF_MONTH) {
              return ValueRange.of(1, getMonth().minLength(), getMonth().maxLength());
          }
          return TemporalAccessor.super.range(field);
      }
  
      /**
       * Gets the value of the specified field from this month-day as an {@code int}.
       * <p>
       * This queries this month-day for the value of the specified field.
       * The returned value will always be within the valid range of values for the field.
       * If it is not possible to return the value, because the field is not supported
       * or for some other reason, an exception is thrown.
       * <p>
       * If the field is a {@link ChronoField} then the query is implemented here.
       * The {@link #isSupported(TemporalField) supported fields} will return valid
       * values based on this month-day.
       * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
       * <p>
       * If the field is not a {@code ChronoField}, then the result of this method
       * is obtained by invoking {@code TemporalField.getFrom(TemporalAccessor)}
       * passing {@code this} as the argument. Whether the value can be obtained,
       * and what the value represents, is determined by the field.
       *
       * @param field  the field to get, not null
       * @return the value for the field
       * @throws DateTimeException if a value for the field cannot be obtained or
       *         the value is outside the range of valid values for the field
       * @throws UnsupportedTemporalTypeException if the field is not supported or
       *         the range of values exceeds an {@code int}
       * @throws ArithmeticException if numeric overflow occurs
       */
      @Override  // override for Javadoc
      public int get(TemporalField field) {
          return range(field).checkValidIntValue(getLong(field), field);
      }
  
      /**
       * Gets the value of the specified field from this month-day as a {@code long}.
       * <p>
       * This queries this month-day for the value of the specified field.
       * If it is not possible to return the value, because the field is not supported
       * or for some other reason, an exception is thrown.
       * <p>
       * If the field is a {@link ChronoField} then the query is implemented here.
       * The {@link #isSupported(TemporalField) supported fields} will return valid
       * values based on this month-day.
       * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
       * <p>
       * If the field is not a {@code ChronoField}, then the result of this method
       * is obtained by invoking {@code TemporalField.getFrom(TemporalAccessor)}
       * passing {@code this} as the argument. Whether the value can be obtained,
       * and what the value represents, is determined by the field.
       *
       * @param field  the field to get, not null
       * @return the value for the field
       * @throws DateTimeException if a value for the field cannot be obtained
       * @throws UnsupportedTemporalTypeException if the field is not supported
       * @throws ArithmeticException if numeric overflow occurs
       */
      @Override
      public long getLong(TemporalField field) {
          if (field instanceof ChronoField) {
              switch ((ChronoField) field) {
                  // alignedDOW and alignedWOM not supported because they cannot be set in with()
                  case DAY_OF_MONTH: return day;
                  case MONTH_OF_YEAR: return month;
              }
              throw new UnsupportedTemporalTypeException("Unsupported field: " + field);
          }
          return field.getFrom(this);
      }
  
      //-----------------------------------------------------------------------
      /**
       * Gets the month-of-year field from 1 to 12.
       * <p>
       * This method returns the month as an {@code int} from 1 to 12.
       * Application code is frequently clearer if the enum {@link Month}
       * is used by calling {@link #getMonth()}.
       *
       * @return the month-of-year, from 1 to 12
       * @see #getMonth()
       */
      public int getMonthValue() {
          return month;
      }
  
      /**
       * Gets the month-of-year field using the {@code Month} enum.
       * <p>
       * This method returns the enum {@link Month} for the month.
       * This avoids confusion as to what {@code int} values mean.
       * If you need access to the primitive {@code int} value then the enum
       * provides the {@link Month#getValue() int value}.
       *
       * @return the month-of-year, not null
       * @see #getMonthValue()
       */
      public Month getMonth() {
          return Month.of(month);
      }
  
      /**
       * Gets the day-of-month field.
       * <p>
       * This method returns the primitive {@code int} value for the day-of-month.
       *
       * @return the day-of-month, from 1 to 31
       */
      public int getDayOfMonth() {
          return day;
      }
  
      //-----------------------------------------------------------------------
      /**
       * Checks if the year is valid for this month-day.
       * <p>
       * This method checks whether this month and day and the input year form
       * a valid date. This can only return false for February 29th.
       *
       * @param year  the year to validate
       * @return true if the year is valid for this month-day
       * @see Year#isValidMonthDay(MonthDay)
       */
      public boolean isValidYear(int year) {
          return (day == 29 && month == 2 && Year.isLeap(year) == false) == false;
      }
  
      //-----------------------------------------------------------------------
      /**
       * Returns a copy of this {@code MonthDay} with the month-of-year altered.
       * <p>
       * This returns a month-day with the specified month.
       * If the day-of-month is invalid for the specified month, the day will
       * be adjusted to the last valid day-of-month.
       * <p>
       * This instance is immutable and unaffected by this method call.
       *
       * @param month  the month-of-year to set in the returned month-day, from 1 (January) to 12 (December)
       * @return a {@code MonthDay} based on this month-day with the requested month, not null
       * @throws DateTimeException if the month-of-year value is invalid
       */
      public MonthDay withMonth(int month) {
          return with(Month.of(month));
      }
  
      /**
       * Returns a copy of this {@code MonthDay} with the month-of-year altered.
       * <p>
       * This returns a month-day with the specified month.
       * If the day-of-month is invalid for the specified month, the day will
       * be adjusted to the last valid day-of-month.
       * <p>
       * This instance is immutable and unaffected by this method call.
       *
       * @param month  the month-of-year to set in the returned month-day, not null
       * @return a {@code MonthDay} based on this month-day with the requested month, not null
       */
      public MonthDay with(Month month) {
          Objects.requireNonNull(month, "month");
          if (month.getValue() == this.month) {
              return this;
          }
          int day = Math.min(this.day, month.maxLength());
          return new MonthDay(month.getValue(), day);
      }
  
      /**
       * Returns a copy of this {@code MonthDay} with the day-of-month altered.
       * <p>
       * This returns a month-day with the specified day-of-month.
       * If the day-of-month is invalid for the month, an exception is thrown.
       * <p>
       * This instance is immutable and unaffected by this method call.
       *
       * @param dayOfMonth  the day-of-month to set in the return month-day, from 1 to 31
       * @return a {@code MonthDay} based on this month-day with the requested day, not null
       * @throws DateTimeException if the day-of-month value is invalid,
       *  or if the day-of-month is invalid for the month
       */
      public MonthDay withDayOfMonth(int dayOfMonth) {
          if (dayOfMonth == this.day) {
              return this;
          }
          return of(month, dayOfMonth);
      }
  
      //-----------------------------------------------------------------------
      /**
       * Queries this month-day using the specified query.
       * <p>
       * This queries this month-day using the specified query strategy object.
       * The {@code TemporalQuery} object defines the logic to be used to
       * obtain the result. Read the documentation of the query to understand
       * what the result of this method will be.
       * <p>
       * The result of this method is obtained by invoking the
       * {@link TemporalQuery#queryFrom(TemporalAccessor)} method on the
       * specified query passing {@code this} as the argument.
       *
       * @param <R> the type of the result
       * @param query  the query to invoke, not null
       * @return the query result, null may be returned (defined by the query)
       * @throws DateTimeException if unable to query (defined by the query)
       * @throws ArithmeticException if numeric overflow occurs (defined by the query)
       */
      @SuppressWarnings("unchecked")
      @Override
      public <R> R query(TemporalQuery<R> query) {
          if (query == TemporalQueries.chronology()) {
              return (R) IsoChronology.INSTANCE;
          }
          return TemporalAccessor.super.query(query);
      }
  
      /**
       * Adjusts the specified temporal object to have this month-day.
       * <p>
       * This returns a temporal object of the same observable type as the input
       * with the month and day-of-month changed to be the same as this.
       * <p>
       * The adjustment is equivalent to using {@link Temporal#with(TemporalField, long)}
       * twice, passing {@link ChronoField#MONTH_OF_YEAR} and
       * {@link ChronoField#DAY_OF_MONTH} as the fields.
       * If the specified temporal object does not use the ISO calendar system then
       * a {@code DateTimeException} is thrown.
       * <p>
       * In most cases, it is clearer to reverse the calling pattern by using
       * {@link Temporal#with(TemporalAdjuster)}:
       * <pre>
       *   // these two lines are equivalent, but the second approach is recommended
       *   temporal = thisMonthDay.adjustInto(temporal);
       *   temporal = temporal.with(thisMonthDay);
       * </pre>
       * <p>
       * This instance is immutable and unaffected by this method call.
       *
       * @param temporal  the target object to be adjusted, not null
       * @return the adjusted object, not null
       * @throws DateTimeException if unable to make the adjustment
       * @throws ArithmeticException if numeric overflow occurs
       */
      @Override
      public Temporal adjustInto(Temporal temporal) {
          if (Chronology.from(temporal).equals(IsoChronology.INSTANCE) == false) {
              throw new DateTimeException("Adjustment only supported on ISO date-time");
          }
          temporal = temporal.with(MONTH_OF_YEAR, month);
          return temporal.with(DAY_OF_MONTH, Math.min(temporal.range(DAY_OF_MONTH).getMaximum(), day));
      }
  
      /**
       * Formats this month-day using the specified formatter.
       * <p>
       * This month-day will be passed to the formatter to produce a string.
       *
       * @param formatter  the formatter to use, not null
       * @return the formatted month-day string, not null
       * @throws DateTimeException if an error occurs during printing
       */
      public String format(DateTimeFormatter formatter) {
          Objects.requireNonNull(formatter, "formatter");
          return formatter.format(this);
      }
  
      //-----------------------------------------------------------------------
      /**
       * Combines this month-day with a year to create a {@code LocalDate}.
       * <p>
       * This returns a {@code LocalDate} formed from this month-day and the specified year.
       * <p>
       * A month-day of February 29th will be adjusted to February 28th in the resulting
       * date if the year is not a leap year.
       * <p>
       * This instance is immutable and unaffected by this method call.
       *
       * @param year  the year to use, from MIN_YEAR to MAX_YEAR
       * @return the local date formed from this month-day and the specified year, not null
       * @throws DateTimeException if the year is outside the valid range of years
       */
      public LocalDate atYear(int year) {
          return LocalDate.of(year, month, isValidYear(year) ? day : 28);
      }
  
      //-----------------------------------------------------------------------
      /**
       * Compares this month-day to another month-day.
       * <p>
       * The comparison is based first on value of the month, then on the value of the day.
       * It is "consistent with equals", as defined by {@link Comparable}.
       *
       * @param other  the other month-day to compare to, not null
       * @return the comparator value, negative if less, positive if greater
       */
      @Override
      public int compareTo(MonthDay other) {
          int cmp = (month - other.month);
          if (cmp == 0) {
              cmp = (day - other.day);
          }
          return cmp;
      }
  
      /**
       * Checks if this month-day is after the specified month-day.
       *
       * @param other  the other month-day to compare to, not null
       * @return true if this is after the specified month-day
       */
      public boolean isAfter(MonthDay other) {
          return compareTo(other) > 0;
      }
  
      /**
       * Checks if this month-day is before the specified month-day.
       *
       * @param other  the other month-day to compare to, not null
       * @return true if this point is before the specified month-day
       */
      public boolean isBefore(MonthDay other) {
          return compareTo(other) < 0;
      }
  
      //-----------------------------------------------------------------------
      /**
       * Checks if this month-day is equal to another month-day.
       * <p>
       * The comparison is based on the time-line position of the month-day within a year.
       *
       * @param obj  the object to check, null returns false
       * @return true if this is equal to the other month-day
       */
      @Override
      public boolean equals(Object obj) {
          if (this == obj) {
              return true;
          }
          if (obj instanceof MonthDay) {
              MonthDay other = (MonthDay) obj;
              return month == other.month && day == other.day;
          }
          return false;
      }
  
      /**
       * A hash code for this month-day.
       *
       * @return a suitable hash code
       */
      @Override
      public int hashCode() {
          return (month << 6) + day;
      }
  
      //-----------------------------------------------------------------------
      /**
       * Outputs this month-day as a {@code String}, such as {@code --12-03}.
       * <p>
       * The output will be in the format {@code --MM-dd}:
       *
       * @return a string representation of this month-day, not null
       */
      @Override
      public String toString() {
          return new StringBuilder(10).append("--")
              .append(month < 10 ? "0" : "").append(month)
              .append(day < 10 ? "-0" : "-").append(day)
              .toString();
      }
  
      //-----------------------------------------------------------------------
      /**
       * Writes the object using a
       * <a href="../../serialized-form.html#java.time.Ser">dedicated serialized form</a>.
       * @serialData
       * <pre>
       *  out.writeByte(13);  // identifies a MonthDay
       *  out.writeByte(month);
       *  out.writeByte(day);
       * </pre>
       *
       * @return the instance of {@code Ser}, not null
       */
      private Object writeReplace() {
          return new Ser(Ser.MONTH_DAY_TYPE, this);
      }
  
      /**
       * Defend against malicious streams.
       *
       * @param s the stream to read
       * @throws InvalidObjectException always
       */
      private void readObject(ObjectInputStream s) throws InvalidObjectException {
          throw new InvalidObjectException("Deserialization via serialization delegate");
      }
  
      void writeExternal(DataOutput out) throws IOException {
          out.writeByte(month);
          out.writeByte(day);
      }
  
      static MonthDay readExternal(DataInput in) throws IOException {
          byte month = in.readByte();
          byte day = in.readByte();
          return MonthDay.of(month, day);
      }
  
  }
  