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 */
1099 * @serialData
1100 * <pre>
1101 * out.writeByte(11); // identifies a Year
1102 * out.writeInt(year);
1103 * </pre>
1104 *
1105 * @return the instance of {@code Ser}, not null
1106 */
1107 @java.io.Serial
1108 private Object writeReplace() {
1109 return new Ser(Ser.YEAR_TYPE, this);
1110 }
1111
1112 /**
1113 * Defend against malicious streams.
1114 *
1115 * @param s the stream to read
1116 * @throws InvalidObjectException always
1117 */
1118 @java.io.Serial
1119 private void readObject(ObjectInputStream s) throws InvalidObjectException {
1120 throw new InvalidObjectException("Deserialization via serialization delegate");
1121 }
1122
1123 void writeExternal(DataOutput out) throws IOException {
1124 out.writeInt(year);
1125 }
1126
1127 static Year readExternal(DataInput in) throws IOException {
1128 return Year.of(in.readInt());
1129 }
1130
1131 }
|
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 */
1107 * @serialData
1108 * <pre>
1109 * out.writeByte(11); // identifies a Year
1110 * out.writeInt(year);
1111 * </pre>
1112 *
1113 * @return the instance of {@code Ser}, not null
1114 */
1115 @java.io.Serial
1116 private Object writeReplace() {
1117 return new Ser(Ser.YEAR_TYPE, this);
1118 }
1119
1120 /**
1121 * Defend against malicious streams.
1122 *
1123 * @param s the stream to read
1124 * @throws InvalidObjectException always
1125 */
1126 @java.io.Serial
1127 @SuppressWarnings("serial") // this method is not invoked for value classes
1128 private void readObject(ObjectInputStream s) throws InvalidObjectException {
1129 throw new InvalidObjectException("Deserialization via serialization delegate");
1130 }
1131
1132 void writeExternal(DataOutput out) throws IOException {
1133 out.writeInt(year);
1134 }
1135
1136 static Year readExternal(DataInput in) throws IOException {
1137 return Year.of(in.readInt());
1138 }
1139
1140 }
|