9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package java.lang;
27
28 import jdk.internal.misc.CDS;
29 import jdk.internal.vm.annotation.IntrinsicCandidate;
30 import jdk.internal.vm.annotation.Stable;
31
32 import java.lang.constant.Constable;
33 import java.lang.constant.DynamicConstantDesc;
34 import java.util.Optional;
35
36 import static java.lang.constant.ConstantDescs.BSM_EXPLICIT_CAST;
37 import static java.lang.constant.ConstantDescs.CD_byte;
38 import static java.lang.constant.ConstantDescs.CD_int;
39 import static java.lang.constant.ConstantDescs.DEFAULT_NAME;
40
41 /**
42 * The {@code Byte} class is the {@linkplain
43 * java.lang##wrapperClass wrapper class} for values of the primitive
44 * type {@code byte}. An object of type {@code Byte} contains a
45 * single field whose type is {@code byte}.
46 *
47 * <p>In addition, this class provides several methods for converting
48 * a {@code byte} to a {@code String} and a {@code String} to a {@code
49 * byte}, as well as other constants and methods useful when dealing
50 * with a {@code byte}.
51 *
52 * <p>This is a <a href="{@docRoot}/java.base/java/lang/doc-files/ValueBased.html">value-based</a>
53 * class; programmers should treat instances that are
54 * {@linkplain #equals(Object) equal} as interchangeable and should not
55 * use instances for synchronization, or unpredictable behavior may
56 * occur. For example, in a future release, synchronization may fail.
57 *
58 * @author Nakul Saraiya
59 * @author Joseph D. Darcy
60 * @see java.lang.Number
61 * @since 1.1
62 */
63 @jdk.internal.ValueBased
64 public final class Byte extends Number implements Comparable<Byte>, Constable {
65
66 /**
67 * A constant holding the minimum value a {@code byte} can
68 * have, -2<sup>7</sup>.
69 */
70 public static final byte MIN_VALUE = -128;
71
72 /**
73 * A constant holding the maximum value a {@code byte} can
74 * have, 2<sup>7</sup>-1.
75 */
76 public static final byte MAX_VALUE = 127;
77
78 /**
79 * The {@code Class} instance representing the primitive type
80 * {@code byte}.
81 */
82 public static final Class<Byte> TYPE = Class.getPrimitiveClass("byte");
127 }
128 cache = archivedCache;
129 assert cache.length == size;
130 }
131 }
132
133 /**
134 * Returns a {@code Byte} instance representing the specified
135 * {@code byte} value.
136 * If a new {@code Byte} instance is not required, this method
137 * should generally be used in preference to the constructor
138 * {@link #Byte(byte)}, as this method is likely to yield
139 * significantly better space and time performance since
140 * all byte values are cached.
141 *
142 * @param b a byte value.
143 * @return a {@code Byte} instance representing {@code b}.
144 * @since 1.5
145 */
146 @IntrinsicCandidate
147 public static Byte valueOf(byte b) {
148 final int offset = 128;
149 return ByteCache.cache[(int)b + offset];
150 }
151
152 /**
153 * Parses the string argument as a signed {@code byte} in the
154 * radix specified by the second argument. The characters in the
155 * string must all be digits, of the specified radix (as
156 * determined by whether {@link java.lang.Character#digit(char,
157 * int)} returns a nonnegative value) except that the first
158 * character may be an ASCII minus sign {@code '-'}
159 * ({@code '\u005Cu002D'}) to indicate a negative value or an
160 * ASCII plus sign {@code '+'} ({@code '\u005Cu002B'}) to
161 * indicate a positive value. The resulting {@code byte} value is
162 * returned.
163 *
164 * <p>An exception of type {@code NumberFormatException} is
165 * thrown if any of the following situations occurs:
166 * <ul>
|
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package java.lang;
27
28 import jdk.internal.misc.CDS;
29 import jdk.internal.value.DeserializeConstructor;
30 import jdk.internal.vm.annotation.IntrinsicCandidate;
31 import jdk.internal.vm.annotation.Stable;
32
33 import java.lang.constant.Constable;
34 import java.lang.constant.DynamicConstantDesc;
35 import java.util.Optional;
36
37 import static java.lang.constant.ConstantDescs.BSM_EXPLICIT_CAST;
38 import static java.lang.constant.ConstantDescs.CD_byte;
39 import static java.lang.constant.ConstantDescs.DEFAULT_NAME;
40
41 /**
42 * The {@code Byte} class is the {@linkplain
43 * java.lang##wrapperClass wrapper class} for values of the primitive
44 * type {@code byte}. An object of type {@code Byte} contains a
45 * single field whose type is {@code byte}.
46 *
47 * <p>In addition, this class provides several methods for converting
48 * a {@code byte} to a {@code String} and a {@code String} to a {@code
49 * byte}, as well as other constants and methods useful when dealing
50 * with a {@code byte}.
51 *
52 * <p>This is a <a href="{@docRoot}/java.base/java/lang/doc-files/ValueBased.html">value-based</a>
53 * class; programmers should treat instances that are {@linkplain #equals(Object) equal}
54 * as interchangeable and should not use instances for synchronization, mutexes, or
55 * with {@linkplain java.lang.ref.Reference object references}.
56 *
57 * <div class="preview-block">
58 * <div class="preview-comment">
59 * When preview features are enabled, {@code Byte} is a {@linkplain Class#isValue value class}.
60 * Use of value class instances for synchronization, mutexes, or with
61 * {@linkplain java.lang.ref.Reference object references} result in
62 * {@link IdentityException}.
63 * </div>
64 * </div>
65 *
66 * @author Nakul Saraiya
67 * @author Joseph D. Darcy
68 * @see java.lang.Number
69 * @since 1.1
70 */
71 @jdk.internal.MigratedValueClass
72 @jdk.internal.ValueBased
73 public final class Byte extends Number implements Comparable<Byte>, Constable {
74
75 /**
76 * A constant holding the minimum value a {@code byte} can
77 * have, -2<sup>7</sup>.
78 */
79 public static final byte MIN_VALUE = -128;
80
81 /**
82 * A constant holding the maximum value a {@code byte} can
83 * have, 2<sup>7</sup>-1.
84 */
85 public static final byte MAX_VALUE = 127;
86
87 /**
88 * The {@code Class} instance representing the primitive type
89 * {@code byte}.
90 */
91 public static final Class<Byte> TYPE = Class.getPrimitiveClass("byte");
136 }
137 cache = archivedCache;
138 assert cache.length == size;
139 }
140 }
141
142 /**
143 * Returns a {@code Byte} instance representing the specified
144 * {@code byte} value.
145 * If a new {@code Byte} instance is not required, this method
146 * should generally be used in preference to the constructor
147 * {@link #Byte(byte)}, as this method is likely to yield
148 * significantly better space and time performance since
149 * all byte values are cached.
150 *
151 * @param b a byte value.
152 * @return a {@code Byte} instance representing {@code b}.
153 * @since 1.5
154 */
155 @IntrinsicCandidate
156 @DeserializeConstructor
157 public static Byte valueOf(byte b) {
158 final int offset = 128;
159 return ByteCache.cache[(int)b + offset];
160 }
161
162 /**
163 * Parses the string argument as a signed {@code byte} in the
164 * radix specified by the second argument. The characters in the
165 * string must all be digits, of the specified radix (as
166 * determined by whether {@link java.lang.Character#digit(char,
167 * int)} returns a nonnegative value) except that the first
168 * character may be an ASCII minus sign {@code '-'}
169 * ({@code '\u005Cu002D'}) to indicate a negative value or an
170 * ASCII plus sign {@code '+'} ({@code '\u005Cu002B'}) to
171 * indicate a positive value. The resulting {@code byte} value is
172 * returned.
173 *
174 * <p>An exception of type {@code NumberFormatException} is
175 * thrown if any of the following situations occurs:
176 * <ul>
|