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 java.lang.annotation.Native;
29 import java.lang.invoke.MethodHandles;
30 import java.lang.constant.Constable;
31 import java.lang.constant.ConstantDesc;
32 import java.math.*;
33 import java.util.Objects;
34 import java.util.Optional;
35
36 import jdk.internal.misc.CDS;
37 import jdk.internal.util.DecimalDigits;
38 import jdk.internal.vm.annotation.ForceInline;
39 import jdk.internal.vm.annotation.IntrinsicCandidate;
40 import jdk.internal.vm.annotation.Stable;
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 Long} class wraps a value of the primitive type {@code
49 * long} in an object. An object of type {@code Long} contains a
50 * single field whose type is {@code long}.
51 *
52 * <p> In addition, this class provides several methods for converting
53 * a {@code long} to a {@code String} and a {@code String} to a {@code
54 * long}, as well as other constants and methods useful when dealing
55 * with a {@code long}.
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(long) highestOneBit} and
65 * {@link #numberOfTrailingZeros(long) 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 Long extends Number
77 implements Comparable<Long>, Constable, ConstantDesc {
78 /**
79 * A constant holding the minimum value a {@code long} can
80 * have, -2<sup>63</sup>.
81 */
82 @Native public static final long MIN_VALUE = 0x8000000000000000L;
83
84 /**
85 * A constant holding the maximum value a {@code long} can
86 * have, 2<sup>63</sup>-1.
87 */
88 @Native public static final long MAX_VALUE = 0x7fffffffffffffffL;
89
90 /**
91 * The {@code Class} instance representing the primitive type
92 * {@code long}.
93 *
94 * @since 1.1
973 }
974 }
975
976 /**
977 * Returns a {@code Long} instance representing the specified
978 * {@code long} value.
979 * If a new {@code Long} instance is not required, this method
980 * should generally be used in preference to the constructor
981 * {@link #Long(long)}, as this method is likely to yield
982 * significantly better space and time performance by caching
983 * 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 l a long value.
989 * @return a {@code Long} instance representing {@code l}.
990 * @since 1.5
991 */
992 @IntrinsicCandidate
993 public static Long valueOf(long l) {
994 final int offset = 128;
995 if (l >= -128 && l <= 127) { // will cache
996 return LongCache.cache[(int)l + offset];
997 }
998 return new Long(l);
999 }
1000
1001 /**
1002 * Decodes a {@code String} into a {@code Long}.
1003 * Accepts decimal, hexadecimal, and octal numbers given by the
1004 * following grammar:
1005 *
1006 * <blockquote>
1007 * <dl>
1008 * <dt><i>DecodableString:</i>
1009 * <dd><i>Sign<sub>opt</sub> DecimalNumeral</i>
1010 * <dd><i>Sign<sub>opt</sub></i> {@code 0x} <i>HexDigits</i>
1011 * <dd><i>Sign<sub>opt</sub></i> {@code 0X} <i>HexDigits</i>
1012 * <dd><i>Sign<sub>opt</sub></i> {@code #} <i>HexDigits</i>
|
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 java.lang.annotation.Native;
29 import java.lang.invoke.MethodHandles;
30 import java.lang.constant.Constable;
31 import java.lang.constant.ConstantDesc;
32 import java.math.*;
33 import java.util.Objects;
34 import java.util.Optional;
35
36 import jdk.internal.misc.CDS;
37 import jdk.internal.value.DeserializeConstructor;
38 import jdk.internal.util.DecimalDigits;
39 import jdk.internal.vm.annotation.ForceInline;
40 import jdk.internal.vm.annotation.IntrinsicCandidate;
41 import jdk.internal.vm.annotation.Stable;
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 Long} class wraps a value of the primitive type {@code
50 * long} in an object. An object of type {@code Long} contains a
51 * single field whose type is {@code long}.
52 *
53 * <p> In addition, this class provides several methods for converting
54 * a {@code long} to a {@code String} and a {@code String} to a {@code
55 * long}, as well as other constants and methods useful when dealing
56 * with a {@code long}.
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(long) highestOneBit} and
66 * {@link #numberOfTrailingZeros(long) 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 Long extends Number
79 implements Comparable<Long>, Constable, ConstantDesc {
80 /**
81 * A constant holding the minimum value a {@code long} can
82 * have, -2<sup>63</sup>.
83 */
84 @Native public static final long MIN_VALUE = 0x8000000000000000L;
85
86 /**
87 * A constant holding the maximum value a {@code long} can
88 * have, 2<sup>63</sup>-1.
89 */
90 @Native public static final long MAX_VALUE = 0x7fffffffffffffffL;
91
92 /**
93 * The {@code Class} instance representing the primitive type
94 * {@code long}.
95 *
96 * @since 1.1
975 }
976 }
977
978 /**
979 * Returns a {@code Long} instance representing the specified
980 * {@code long} value.
981 * If a new {@code Long} instance is not required, this method
982 * should generally be used in preference to the constructor
983 * {@link #Long(long)}, as this method is likely to yield
984 * significantly better space and time performance by caching
985 * frequently requested values.
986 *
987 * This method will always cache values in the range -128 to 127,
988 * inclusive, and may cache other values outside of this range.
989 *
990 * @param l a long value.
991 * @return a {@code Long} instance representing {@code l}.
992 * @since 1.5
993 */
994 @IntrinsicCandidate
995 @DeserializeConstructor
996 public static Long valueOf(long l) {
997 final int offset = 128;
998 if (l >= -128 && l <= 127) { // will cache
999 return LongCache.cache[(int)l + offset];
1000 }
1001 return new Long(l);
1002 }
1003
1004 /**
1005 * Decodes a {@code String} into a {@code Long}.
1006 * Accepts decimal, hexadecimal, and octal numbers given by the
1007 * following grammar:
1008 *
1009 * <blockquote>
1010 * <dl>
1011 * <dt><i>DecodableString:</i>
1012 * <dd><i>Sign<sub>opt</sub> DecimalNumeral</i>
1013 * <dd><i>Sign<sub>opt</sub></i> {@code 0x} <i>HexDigits</i>
1014 * <dd><i>Sign<sub>opt</sub></i> {@code 0X} <i>HexDigits</i>
1015 * <dd><i>Sign<sub>opt</sub></i> {@code #} <i>HexDigits</i>
|