104 * <p>
105 * <b>Note that years in the ISO chronology only align with years in the
106 * Gregorian-Julian system for modern years. Parts of Russia did not switch to the
107 * modern Gregorian/ISO rules until 1920.
108 * As such, historical years must be treated with caution.</b>
109 * <p>
110 * This class does not store or represent a month, day, time or time-zone.
111 * For example, the value "2007" can be stored in a {@code Year}.
112 * <p>
113 * Years represented by this class follow the ISO-8601 standard and use
114 * the proleptic numbering system. Year 1 is preceded by year 0, then by year -1.
115 * <p>
116 * The ISO-8601 calendar system is the modern civil calendar system used today
117 * in most of the world. It is equivalent to the proleptic Gregorian calendar
118 * system, in which today's rules for leap years are applied for all time.
119 * For most applications written today, the ISO-8601 rules are entirely suitable.
120 * However, any application that makes use of historical dates, and requires them
121 * to be accurate will find the ISO-8601 approach unsuitable.
122 * <p>
123 * This is a <a href="{@docRoot}/java.base/java/lang/doc-files/ValueBased.html">value-based</a>
124 * class; programmers should treat instances that are
125 * {@linkplain #equals(Object) equal} as interchangeable and should not
126 * use instances for synchronization, or unpredictable behavior may
127 * occur. For example, in a future release, synchronization may fail.
128 * The {@code equals} method should be used for comparisons.
129 *
130 * @implSpec
131 * This class is immutable and thread-safe.
132 *
133 * @since 1.8
134 */
135 @jdk.internal.ValueBased
136 public final class Year
137 implements Temporal, TemporalAdjuster, Comparable<Year>, Serializable {
138
139 /**
140 * The minimum supported year, '-999,999,999'.
141 */
142 public static final int MIN_VALUE = -999_999_999;
143 /**
144 * The maximum supported year, '+999,999,999'.
145 */
146 public static final int MAX_VALUE = 999_999_999;
147
148 /**
149 * Serialization version.
150 */
151 @java.io.Serial
152 private static final long serialVersionUID = -23038383694477807L;
153 /**
154 * Parser.
155 */
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104 * <p>
105 * <b>Note that years in the ISO chronology only align with years in the
106 * Gregorian-Julian system for modern years. Parts of Russia did not switch to the
107 * modern Gregorian/ISO rules until 1920.
108 * As such, historical years must be treated with caution.</b>
109 * <p>
110 * This class does not store or represent a month, day, time or time-zone.
111 * For example, the value "2007" can be stored in a {@code Year}.
112 * <p>
113 * Years represented by this class follow the ISO-8601 standard and use
114 * the proleptic numbering system. Year 1 is preceded by year 0, then by year -1.
115 * <p>
116 * The ISO-8601 calendar system is the modern civil calendar system used today
117 * in most of the world. It is equivalent to the proleptic Gregorian calendar
118 * system, in which today's rules for leap years are applied for all time.
119 * For most applications written today, the ISO-8601 rules are entirely suitable.
120 * However, any application that makes use of historical dates, and requires them
121 * to be accurate will find the ISO-8601 approach unsuitable.
122 * <p>
123 * This is a <a href="{@docRoot}/java.base/java/lang/doc-files/ValueBased.html">value-based</a>
124 * class; programmers should treat instances that are {@linkplain #equals(Object) equal}
125 * as interchangeable and should not use instances for synchronization, mutexes, or
126 * with {@linkplain java.lang.ref.Reference object references}.
127 *
128 * <div class="preview-block">
129 * <div class="preview-comment">
130 * When preview features are enabled, {@code Year} is a {@linkplain Class#isValue value class}.
131 * Use of value class instances for synchronization, mutexes, or with
132 * {@linkplain java.lang.ref.Reference object references} result in
133 * {@link IdentityException}.
134 * </div>
135 * </div>
136 *
137 * @implSpec
138 * This class is immutable and thread-safe.
139 *
140 * @since 1.8
141 */
142 @jdk.internal.ValueBased
143 @jdk.internal.MigratedValueClass
144 public final class Year
145 implements Temporal, TemporalAdjuster, Comparable<Year>, Serializable {
146
147 /**
148 * The minimum supported year, '-999,999,999'.
149 */
150 public static final int MIN_VALUE = -999_999_999;
151 /**
152 * The maximum supported year, '+999,999,999'.
153 */
154 public static final int MAX_VALUE = 999_999_999;
155
156 /**
157 * Serialization version.
158 */
159 @java.io.Serial
160 private static final long serialVersionUID = -23038383694477807L;
161 /**
162 * Parser.
163 */
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