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.misc.VM;
30 import jdk.internal.util.DecimalDigits;
31 import jdk.internal.vm.annotation.ForceInline;
32 import jdk.internal.vm.annotation.IntrinsicCandidate;
33 import jdk.internal.vm.annotation.Stable;
34
35 import java.lang.annotation.Native;
36 import java.lang.constant.Constable;
37 import java.lang.constant.ConstantDesc;
38 import java.lang.invoke.MethodHandles;
39 import java.util.Objects;
40 import java.util.Optional;
41
42 import static java.lang.Character.digit;
43 import static java.lang.String.COMPACT_STRINGS;
44 import static java.lang.String.LATIN1;
45 import static java.lang.String.UTF16;
46
47 /**
48 * The {@code Integer} class wraps a value of the primitive type
49 * {@code int} in an object. An object of type {@code Integer}
50 * contains a single field whose type is {@code int}.
55 * dealing with an {@code int}.
56 *
57 * <p>This is a <a href="{@docRoot}/java.base/java/lang/doc-files/ValueBased.html">value-based</a>
58 * class; programmers should treat instances that are
59 * {@linkplain #equals(Object) equal} as interchangeable and should not
60 * use instances for synchronization, or unpredictable behavior may
61 * occur. For example, in a future release, synchronization may fail.
62 *
63 * <p>Implementation note: The implementations of the "bit twiddling"
64 * methods (such as {@link #highestOneBit(int) highestOneBit} and
65 * {@link #numberOfTrailingZeros(int) numberOfTrailingZeros}) are
66 * based on material from Henry S. Warren, Jr.'s <i>Hacker's
67 * Delight</i>, (Addison Wesley, 2002).
68 *
69 * @author Lee Boynton
70 * @author Arthur van Hoff
71 * @author Josh Bloch
72 * @author Joseph D. Darcy
73 * @since 1.0
74 */
75 @jdk.internal.ValueBased
76 public final class Integer extends Number
77 implements Comparable<Integer>, Constable, ConstantDesc {
78 /**
79 * A constant holding the minimum value an {@code int} can
80 * have, -2<sup>31</sup>.
81 */
82 @Native public static final int MIN_VALUE = 0x80000000;
83
84 /**
85 * A constant holding the maximum value an {@code int} can
86 * have, 2<sup>31</sup>-1.
87 */
88 @Native public static final int MAX_VALUE = 0x7fffffff;
89
90 /**
91 * The {@code Class} instance representing the primitive type
92 * {@code int}.
93 *
94 * @since 1.1
971
972 private IntegerCache() {}
973 }
974
975 /**
976 * Returns an {@code Integer} instance representing the specified
977 * {@code int} value. If a new {@code Integer} instance is not
978 * required, this method should generally be used in preference to
979 * the constructor {@link #Integer(int)}, as this method is likely
980 * to yield significantly better space and time performance by
981 * caching frequently requested values.
982 *
983 * This method will always cache values in the range -128 to 127,
984 * inclusive, and may cache other values outside of this range.
985 *
986 * @param i an {@code int} value.
987 * @return an {@code Integer} instance representing {@code i}.
988 * @since 1.5
989 */
990 @IntrinsicCandidate
991 public static Integer valueOf(int i) {
992 if (i >= IntegerCache.low && i <= IntegerCache.high)
993 return IntegerCache.cache[i + (-IntegerCache.low)];
994 return new Integer(i);
995 }
996
997 /**
998 * The value of the {@code Integer}.
999 *
1000 * @serial
1001 */
1002 private final int value;
1003
1004 /**
1005 * Constructs a newly allocated {@code Integer} object that
1006 * represents the specified {@code int} value.
1007 *
1008 * @param value the value to be represented by the
1009 * {@code Integer} object.
1010 *
|
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.misc.VM;
30 import jdk.internal.util.DecimalDigits;
31 import jdk.internal.value.DeserializeConstructor;
32 import jdk.internal.vm.annotation.ForceInline;
33 import jdk.internal.vm.annotation.IntrinsicCandidate;
34 import jdk.internal.vm.annotation.Stable;
35
36 import java.lang.annotation.Native;
37 import java.lang.constant.Constable;
38 import java.lang.constant.ConstantDesc;
39 import java.lang.invoke.MethodHandles;
40 import java.util.Objects;
41 import java.util.Optional;
42
43 import static java.lang.Character.digit;
44 import static java.lang.String.COMPACT_STRINGS;
45 import static java.lang.String.LATIN1;
46 import static java.lang.String.UTF16;
47
48 /**
49 * The {@code Integer} class wraps a value of the primitive type
50 * {@code int} in an object. An object of type {@code Integer}
51 * contains a single field whose type is {@code int}.
56 * dealing with an {@code int}.
57 *
58 * <p>This is a <a href="{@docRoot}/java.base/java/lang/doc-files/ValueBased.html">value-based</a>
59 * class; programmers should treat instances that are
60 * {@linkplain #equals(Object) equal} as interchangeable and should not
61 * use instances for synchronization, or unpredictable behavior may
62 * occur. For example, in a future release, synchronization may fail.
63 *
64 * <p>Implementation note: The implementations of the "bit twiddling"
65 * methods (such as {@link #highestOneBit(int) highestOneBit} and
66 * {@link #numberOfTrailingZeros(int) numberOfTrailingZeros}) are
67 * based on material from Henry S. Warren, Jr.'s <i>Hacker's
68 * Delight</i>, (Addison Wesley, 2002).
69 *
70 * @author Lee Boynton
71 * @author Arthur van Hoff
72 * @author Josh Bloch
73 * @author Joseph D. Darcy
74 * @since 1.0
75 */
76 @jdk.internal.MigratedValueClass
77 @jdk.internal.ValueBased
78 public final class Integer extends Number
79 implements Comparable<Integer>, Constable, ConstantDesc {
80 /**
81 * A constant holding the minimum value an {@code int} can
82 * have, -2<sup>31</sup>.
83 */
84 @Native public static final int MIN_VALUE = 0x80000000;
85
86 /**
87 * A constant holding the maximum value an {@code int} can
88 * have, 2<sup>31</sup>-1.
89 */
90 @Native public static final int MAX_VALUE = 0x7fffffff;
91
92 /**
93 * The {@code Class} instance representing the primitive type
94 * {@code int}.
95 *
96 * @since 1.1
973
974 private IntegerCache() {}
975 }
976
977 /**
978 * Returns an {@code Integer} instance representing the specified
979 * {@code int} value. If a new {@code Integer} instance is not
980 * required, this method should generally be used in preference to
981 * the constructor {@link #Integer(int)}, as this method is likely
982 * to yield significantly better space and time performance by
983 * caching frequently requested values.
984 *
985 * This method will always cache values in the range -128 to 127,
986 * inclusive, and may cache other values outside of this range.
987 *
988 * @param i an {@code int} value.
989 * @return an {@code Integer} instance representing {@code i}.
990 * @since 1.5
991 */
992 @IntrinsicCandidate
993 @DeserializeConstructor
994 public static Integer valueOf(int i) {
995 if (i >= IntegerCache.low && i <= IntegerCache.high)
996 return IntegerCache.cache[i + (-IntegerCache.low)];
997 return new Integer(i);
998 }
999
1000 /**
1001 * The value of the {@code Integer}.
1002 *
1003 * @serial
1004 */
1005 private final int value;
1006
1007 /**
1008 * Constructs a newly allocated {@code Integer} object that
1009 * represents the specified {@code int} value.
1010 *
1011 * @param value the value to be represented by the
1012 * {@code Integer} object.
1013 *
|