114 * The ISO-8601 calendar system is the modern civil calendar system used today
115 * in most of the world. It is equivalent to the proleptic Gregorian calendar
116 * system, in which today's rules for leap years are applied for all time.
117 * <p>
118 * The period is modeled as a directed amount of time, meaning that individual parts of the
119 * period may be negative.
120 * <p>
121 * This is a <a href="{@docRoot}/java.base/java/lang/doc-files/ValueBased.html">value-based</a>
122 * class; programmers should treat instances that are
123 * {@linkplain #equals(Object) equal} as interchangeable and should not
124 * use instances for synchronization, or unpredictable behavior may
125 * occur. For example, in a future release, synchronization may fail.
126 * The {@code equals} method should be used for comparisons.
127 *
128 * @implSpec
129 * This class is immutable and thread-safe.
130 *
131 * @since 1.8
132 */
133 @jdk.internal.ValueBased
134 public final class Period
135 implements ChronoPeriod, Serializable {
136
137 /**
138 * A constant for a period of zero.
139 */
140 public static final Period ZERO = new Period(0, 0, 0);
141 /**
142 * Serialization version.
143 */
144 @java.io.Serial
145 private static final long serialVersionUID = -3587258372562876L;
146 /**
147 * The pattern for parsing.
148 */
149 private static final Pattern PATTERN =
150 Pattern.compile("([-+]?)P(?:([-+]?[0-9]+)Y)?(?:([-+]?[0-9]+)M)?(?:([-+]?[0-9]+)W)?(?:([-+]?[0-9]+)D)?", Pattern.CASE_INSENSITIVE);
151
152 /**
153 * The set of supported units.
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114 * The ISO-8601 calendar system is the modern civil calendar system used today
115 * in most of the world. It is equivalent to the proleptic Gregorian calendar
116 * system, in which today's rules for leap years are applied for all time.
117 * <p>
118 * The period is modeled as a directed amount of time, meaning that individual parts of the
119 * period may be negative.
120 * <p>
121 * This is a <a href="{@docRoot}/java.base/java/lang/doc-files/ValueBased.html">value-based</a>
122 * class; programmers should treat instances that are
123 * {@linkplain #equals(Object) equal} as interchangeable and should not
124 * use instances for synchronization, or unpredictable behavior may
125 * occur. For example, in a future release, synchronization may fail.
126 * The {@code equals} method should be used for comparisons.
127 *
128 * @implSpec
129 * This class is immutable and thread-safe.
130 *
131 * @since 1.8
132 */
133 @jdk.internal.ValueBased
134 @jdk.internal.MigratedValueClass
135 public final class Period
136 implements ChronoPeriod, Serializable {
137
138 /**
139 * A constant for a period of zero.
140 */
141 public static final Period ZERO = new Period(0, 0, 0);
142 /**
143 * Serialization version.
144 */
145 @java.io.Serial
146 private static final long serialVersionUID = -3587258372562876L;
147 /**
148 * The pattern for parsing.
149 */
150 private static final Pattern PATTERN =
151 Pattern.compile("([-+]?)P(?:([-+]?[0-9]+)Y)?(?:([-+]?[0-9]+)M)?(?:([-+]?[0-9]+)W)?(?:([-+]?[0-9]+)D)?", Pattern.CASE_INSENSITIVE);
152
153 /**
154 * The set of supported units.
|