7 * published by the Free Software Foundation. Oracle designates this
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 /**
29 * The abstract class {@code Number} is the superclass of platform
30 * classes representing numeric values that are convertible to the
31 * primitive types {@code byte}, {@code double}, {@code float}, {@code
32 * int}, {@code long}, and {@code short}.
33 *
34 * The specific semantics of the conversion from the numeric value of
35 * a particular {@code Number} implementation to a given primitive
36 * type is defined by the {@code Number} implementation in question.
37 *
38 * For platform classes, the conversion is often analogous to a
39 * narrowing primitive conversion or a widening primitive conversion
40 * as defined in <cite>The Java Language Specification</cite>
41 * for converting between primitive types. Therefore, conversions may
42 * lose information about the overall magnitude of a numeric value, may
43 * lose precision, and may even return a result of a different sign
44 * than the input.
45 *
46 * See the documentation of a given {@code Number} implementation for
47 * conversion details.
48 *
49 * @author Lee Boynton
50 * @author Arthur van Hoff
51 * @jls 5.1.2 Widening Primitive Conversion
52 * @jls 5.1.3 Narrowing Primitive Conversion
53 * @since 1.0
54 */
55 public abstract class Number implements java.io.Serializable {
56 /**
57 * Constructor for subclasses to call.
58 */
59 public Number() {super();}
60
61 /**
62 * Returns the value of the specified number as an {@code int}.
63 *
64 * @return the numeric value represented by this object after conversion
65 * to type {@code int}.
66 */
67 public abstract int intValue();
68
69 /**
70 * Returns the value of the specified number as a {@code long}.
71 *
72 * @return the numeric value represented by this object after conversion
73 * to type {@code long}.
74 */
|
7 * published by the Free Software Foundation. Oracle designates this
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 * The abstract class {@code Number} is the superclass of platform
29 * classes representing numeric values that are convertible to the
30 * primitive types {@code byte}, {@code double}, {@code float}, {@code
31 * int}, {@code long}, and {@code short}.
32 *
33 * The specific semantics of the conversion from the numeric value of
34 * a particular {@code Number} implementation to a given primitive
35 * type is defined by the {@code Number} implementation in question.
36 *
37 * For platform classes, the conversion is often analogous to a
38 * narrowing primitive conversion or a widening primitive conversion
39 * as defined in <cite>The Java Language Specification</cite>
40 * for converting between primitive types. Therefore, conversions may
41 * lose information about the overall magnitude of a numeric value, may
42 * lose precision, and may even return a result of a different sign
43 * than the input.
44 *
45 * See the documentation of a given {@code Number} implementation for
46 * conversion details.
47 *
48 * <div class="preview-block">
49 * <div class="preview-comment">
50 * When preview features are enabled, {@code Number} is
51 * an abstract {@linkplain Class#isValue value class}.
52 * Subclasses of {@code Number} can be either an {@linkplain Class#isIdentity identity class}
53 * or a {@linkplain Class#isValue value class}.
54 * See {@jls The Java Language Specification 8.1.1.5 Value Classes}.
55 * </div>
56 * </div>
57 *
58 * @author Lee Boynton
59 * @author Arthur van Hoff
60 * @jls 5.1.2 Widening Primitive Conversion
61 * @jls 5.1.3 Narrowing Primitive Conversion
62 * @since 1.0
63 */
64 @jdk.internal.MigratedValueClass
65 public abstract class Number implements java.io.Serializable {
66 /**
67 * Constructor for subclasses to call.
68 */
69 public Number() {super();}
70
71 /**
72 * Returns the value of the specified number as an {@code int}.
73 *
74 * @return the numeric value represented by this object after conversion
75 * to type {@code int}.
76 */
77 public abstract int intValue();
78
79 /**
80 * Returns the value of the specified number as a {@code long}.
81 *
82 * @return the numeric value represented by this object after conversion
83 * to type {@code long}.
84 */
|