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 *
43 * The {@code Byte} class wraps a value of primitive type {@code byte}
44 * in an object. An object of type {@code Byte} contains a single
45 * 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 @SuppressWarnings("unchecked")
127 archivedCache = c;
128 }
129 cache = archivedCache;
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 *
43 * The {@code Byte} class wraps a value of primitive type {@code byte}
44 * in an object. An object of type {@code Byte} contains a single
45 * 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.MigratedValueClass
64 @jdk.internal.ValueBased
65 public final class Byte extends Number implements Comparable<Byte>, Constable {
66
67 /**
68 * A constant holding the minimum value a {@code byte} can
69 * have, -2<sup>7</sup>.
70 */
71 public static final byte MIN_VALUE = -128;
72
73 /**
74 * A constant holding the maximum value a {@code byte} can
75 * have, 2<sup>7</sup>-1.
76 */
77 public static final byte MAX_VALUE = 127;
78
79 /**
80 * The {@code Class} instance representing the primitive type
81 * {@code byte}.
82 */
83 @SuppressWarnings("unchecked")
128 archivedCache = c;
129 }
130 cache = archivedCache;
131 }
132 }
133
134 /**
135 * Returns a {@code Byte} instance representing the specified
136 * {@code byte} value.
137 * If a new {@code Byte} instance is not required, this method
138 * should generally be used in preference to the constructor
139 * {@link #Byte(byte)}, as this method is likely to yield
140 * significantly better space and time performance since
141 * all byte values are cached.
142 *
143 * @param b a byte value.
144 * @return a {@code Byte} instance representing {@code b}.
145 * @since 1.5
146 */
147 @IntrinsicCandidate
148 @DeserializeConstructor
149 public static Byte valueOf(byte b) {
150 final int offset = 128;
151 return ByteCache.cache[(int)b + offset];
152 }
153
154 /**
155 * Parses the string argument as a signed {@code byte} in the
156 * radix specified by the second argument. The characters in the
157 * string must all be digits, of the specified radix (as
158 * determined by whether {@link java.lang.Character#digit(char,
159 * int)} returns a nonnegative value) except that the first
160 * character may be an ASCII minus sign {@code '-'}
161 * ({@code '\u005Cu002D'}) to indicate a negative value or an
162 * ASCII plus sign {@code '+'} ({@code '\u005Cu002B'}) to
163 * indicate a positive value. The resulting {@code byte} value is
164 * returned.
165 *
166 * <p>An exception of type {@code NumberFormatException} is
167 * thrown if any of the following situations occurs:
168 * <ul>
|