8 * particular file as subject to the "Classpath" exception as provided
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.vm.annotation.IntrinsicCandidate;
29
30 import java.lang.constant.Constable;
31 import java.lang.constant.ConstantDesc;
32 import java.lang.constant.ConstantDescs;
33 import java.lang.constant.DynamicConstantDesc;
34 import java.util.Optional;
35
36 import static java.lang.constant.ConstantDescs.BSM_GET_STATIC_FINAL;
37 import static java.lang.constant.ConstantDescs.CD_Boolean;
38
39 /**
40 * The Boolean class wraps a value of the primitive type
41 * {@code boolean} in an object. An object of type
42 * {@code Boolean} contains a single field whose type is
43 * {@code boolean}.
44 *
45 * <p>In addition, this class provides many methods for
46 * converting a {@code boolean} to a {@code String} and a
47 * {@code String} to a {@code boolean}, as well as other
48 * constants and methods useful when dealing with a
49 * {@code boolean}.
50 *
51 * <p>This is a <a href="{@docRoot}/java.base/java/lang/doc-files/ValueBased.html">value-based</a>
52 * class; programmers should treat instances that are
53 * {@linkplain #equals(Object) equal} as interchangeable and should not
54 * use instances for synchronization, or unpredictable behavior may
55 * occur. For example, in a future release, synchronization may fail.
56 *
57 * @author Arthur van Hoff
58 * @since 1.0
59 */
60 @jdk.internal.ValueBased
61 public final class Boolean implements java.io.Serializable,
62 Comparable<Boolean>, Constable
63 {
64 /**
65 * The {@code Boolean} object corresponding to the primitive
66 * value {@code true}.
67 */
68 public static final Boolean TRUE = new Boolean(true);
69
70 /**
71 * The {@code Boolean} object corresponding to the primitive
72 * value {@code false}.
73 */
74 public static final Boolean FALSE = new Boolean(false);
75
76 /**
77 * The Class object representing the primitive type boolean.
78 *
79 * @since 1.1
158 @IntrinsicCandidate
159 public boolean booleanValue() {
160 return value;
161 }
162
163 /**
164 * Returns a {@code Boolean} instance representing the specified
165 * {@code boolean} value. If the specified {@code boolean} value
166 * is {@code true}, this method returns {@code Boolean.TRUE};
167 * if it is {@code false}, this method returns {@code Boolean.FALSE}.
168 * If a new {@code Boolean} instance is not required, this method
169 * should generally be used in preference to the constructor
170 * {@link #Boolean(boolean)}, as this method is likely to yield
171 * significantly better space and time performance.
172 *
173 * @param b a boolean value.
174 * @return a {@code Boolean} instance representing {@code b}.
175 * @since 1.4
176 */
177 @IntrinsicCandidate
178 public static Boolean valueOf(boolean b) {
179 return (b ? TRUE : FALSE);
180 }
181
182 /**
183 * Returns a {@code Boolean} with a value represented by the
184 * specified string. The {@code Boolean} returned represents a
185 * true value if the string argument is not {@code null}
186 * and is equal, ignoring case, to the string {@code "true"}.
187 * Otherwise, a false value is returned, including for a null
188 * argument.
189 *
190 * @param s a string.
191 * @return the {@code Boolean} value represented by the string.
192 */
193 public static Boolean valueOf(String s) {
194 return parseBoolean(s) ? TRUE : FALSE;
195 }
196
197 /**
|
8 * particular file as subject to the "Classpath" exception as provided
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.value.DeserializeConstructor;
29 import jdk.internal.vm.annotation.IntrinsicCandidate;
30
31 import java.lang.constant.Constable;
32 import java.lang.constant.ConstantDescs;
33 import java.lang.constant.DynamicConstantDesc;
34 import java.util.Optional;
35
36 /**
37 * The Boolean class wraps a value of the primitive type
38 * {@code boolean} in an object. An object of type
39 * {@code Boolean} contains a single field whose type is
40 * {@code boolean}.
41 *
42 * <p>In addition, this class provides many methods for
43 * converting a {@code boolean} to a {@code String} and a
44 * {@code String} to a {@code boolean}, as well as other
45 * constants and methods useful when dealing with a
46 * {@code boolean}.
47 *
48 * <p>This is a <a href="{@docRoot}/java.base/java/lang/doc-files/ValueBased.html">value-based</a>
49 * class; programmers should treat instances that are
50 * {@linkplain #equals(Object) equal} as interchangeable and should not
51 * use instances for synchronization, or unpredictable behavior may
52 * occur. For example, in a future release, synchronization may fail.
53 *
54 * @author Arthur van Hoff
55 * @since 1.0
56 */
57 @jdk.internal.MigratedValueClass
58 @jdk.internal.ValueBased
59 public final class Boolean implements java.io.Serializable,
60 Comparable<Boolean>, Constable
61 {
62 /**
63 * The {@code Boolean} object corresponding to the primitive
64 * value {@code true}.
65 */
66 public static final Boolean TRUE = new Boolean(true);
67
68 /**
69 * The {@code Boolean} object corresponding to the primitive
70 * value {@code false}.
71 */
72 public static final Boolean FALSE = new Boolean(false);
73
74 /**
75 * The Class object representing the primitive type boolean.
76 *
77 * @since 1.1
156 @IntrinsicCandidate
157 public boolean booleanValue() {
158 return value;
159 }
160
161 /**
162 * Returns a {@code Boolean} instance representing the specified
163 * {@code boolean} value. If the specified {@code boolean} value
164 * is {@code true}, this method returns {@code Boolean.TRUE};
165 * if it is {@code false}, this method returns {@code Boolean.FALSE}.
166 * If a new {@code Boolean} instance is not required, this method
167 * should generally be used in preference to the constructor
168 * {@link #Boolean(boolean)}, as this method is likely to yield
169 * significantly better space and time performance.
170 *
171 * @param b a boolean value.
172 * @return a {@code Boolean} instance representing {@code b}.
173 * @since 1.4
174 */
175 @IntrinsicCandidate
176 @DeserializeConstructor
177 public static Boolean valueOf(boolean b) {
178 return (b ? TRUE : FALSE);
179 }
180
181 /**
182 * Returns a {@code Boolean} with a value represented by the
183 * specified string. The {@code Boolean} returned represents a
184 * true value if the string argument is not {@code null}
185 * and is equal, ignoring case, to the string {@code "true"}.
186 * Otherwise, a false value is returned, including for a null
187 * argument.
188 *
189 * @param s a string.
190 * @return the {@code Boolean} value represented by the string.
191 */
192 public static Boolean valueOf(String s) {
193 return parseBoolean(s) ? TRUE : FALSE;
194 }
195
196 /**
|