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My first initial commit with all of mine experimental changes.

Dmitry Kabak (userdima committed 13 years ago

Commit d37b88d1 parent 3f5b46618352 files · +2598093 −-8690Browse files

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1+/*
2+ * Copyright (c) 1996, 2009, Oracle and/or its affiliates. All rights reserved.
3+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4+ *
5+ * This code is free software; you can redistribute it and/or modify it
6+ * under the terms of the GNU General Public License version 2 only, as
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 {@code Short} class wraps a value of primitive type {@code
30+ * short} in an object. An object of type {@code Short} contains a
31+ * single field whose type is {@code short}.
32+ *
33+ * <p>In addition, this class provides several methods for converting
34+ * a {@code short} to a {@code String} and a {@code String} to a
35+ * {@code short}, as well as other constants and methods useful when
36+ * dealing with a {@code short}.
37+ *
38+ * @author Nakul Saraiya
39+ * @author Joseph D. Darcy
40+ * @see java.lang.Number
41+ * @since JDK1.1
42+ */
43+public final class Short extends Number implements Comparable<Short> {
44+
45+ /**
46+ * A constant holding the minimum value a {@code short} can
47+ * have, -2<sup>15</sup>.
48+ */
49+ public static final short MIN_VALUE = -32768;
50+
51+ /**
52+ * A constant holding the maximum value a {@code short} can
53+ * have, 2<sup>15</sup>-1.
54+ */
55+ public static final short MAX_VALUE = 32767;
56+
57+ /**
58+ * The {@code Class} instance representing the primitive type
59+ * {@code short}.
60+ */
61+ public static final Class<Short> TYPE = (Class<Short>) Class.getPrimitiveClass("short");
62+
63+ /**
64+ * Returns a new {@code String} object representing the
65+ * specified {@code short}. The radix is assumed to be 10.
66+ *
67+ * @param s the {@code short} to be converted
68+ * @return the string representation of the specified {@code short}
69+ * @see java.lang.Integer#toString(int)
70+ */
71+ public static String toString(short s) {
72+ return Integer.toString((int)s, 10);
73+ }
74+
75+ /**
76+ * Parses the string argument as a signed {@code short} in the
77+ * radix specified by the second argument. The characters in the
78+ * string must all be digits, of the specified radix (as
79+ * determined by whether {@link java.lang.Character#digit(char,
80+ * int)} returns a nonnegative value) except that the first
81+ * character may be an ASCII minus sign {@code '-'}
82+ * (<code>'&#92;u002D'</code>) to indicate a negative value or an
83+ * ASCII plus sign {@code '+'} (<code>'&#92;u002B'</code>) to
84+ * indicate a positive value. The resulting {@code short} value
85+ * is returned.
86+ *
87+ * <p>An exception of type {@code NumberFormatException} is
88+ * thrown if any of the following situations occurs:
89+ * <ul>
90+ * <li> The first argument is {@code null} or is a string of
91+ * length zero.
92+ *
93+ * <li> The radix is either smaller than {@link
94+ * java.lang.Character#MIN_RADIX} or larger than {@link
95+ * java.lang.Character#MAX_RADIX}.
96+ *
97+ * <li> Any character of the string is not a digit of the
98+ * specified radix, except that the first character may be a minus
99+ * sign {@code '-'} (<code>'&#92;u002D'</code>) or plus sign
100+ * {@code '+'} (<code>'&#92;u002B'</code>) provided that the
101+ * string is longer than length 1.
102+ *
103+ * <li> The value represented by the string is not a value of type
104+ * {@code short}.
105+ * </ul>
106+ *
107+ * @param s the {@code String} containing the
108+ * {@code short} representation to be parsed
109+ * @param radix the radix to be used while parsing {@code s}
110+ * @return the {@code short} represented by the string
111+ * argument in the specified radix.
112+ * @throws NumberFormatException If the {@code String}
113+ * does not contain a parsable {@code short}.
114+ */
115+ public static short parseShort(String s, int radix)
116+ throws NumberFormatException {
117+ int i = Integer.parseInt(s, radix);
118+ if (i < MIN_VALUE || i > MAX_VALUE)
119+ throw new NumberFormatException(
120+ "Value out of range. Value:\"" + s + "\" Radix:" + radix);
121+ return (short)i;
122+ }
123+
124+ /**
125+ * Parses the string argument as a signed decimal {@code
126+ * short}. The characters in the string must all be decimal
127+ * digits, except that the first character may be an ASCII minus
128+ * sign {@code '-'} (<code>'&#92;u002D'</code>) to indicate a
129+ * negative value or an ASCII plus sign {@code '+'}
130+ * (<code>'&#92;u002B'</code>) to indicate a positive value. The
131+ * resulting {@code short} value is returned, exactly as if the
132+ * argument and the radix 10 were given as arguments to the {@link
133+ * #parseShort(java.lang.String, int)} method.
134+ *
135+ * @param s a {@code String} containing the {@code short}
136+ * representation to be parsed
137+ * @return the {@code short} value represented by the
138+ * argument in decimal.
139+ * @throws NumberFormatException If the string does not
140+ * contain a parsable {@code short}.
141+ */
142+ public static short parseShort(String s) throws NumberFormatException {
143+ return parseShort(s, 10);
144+ }
145+
146+ /**
147+ * Returns a {@code Short} object holding the value
148+ * extracted from the specified {@code String} when parsed
149+ * with the radix given by the second argument. The first argument
150+ * is interpreted as representing a signed {@code short} in
151+ * the radix specified by the second argument, exactly as if the
152+ * argument were given to the {@link #parseShort(java.lang.String,
153+ * int)} method. The result is a {@code Short} object that
154+ * represents the {@code short} value specified by the string.
155+ *
156+ * <p>In other words, this method returns a {@code Short} object
157+ * equal to the value of:
158+ *
159+ * <blockquote>
160+ * {@code new Short(Short.parseShort(s, radix))}
161+ * </blockquote>
162+ *
163+ * @param s the string to be parsed
164+ * @param radix the radix to be used in interpreting {@code s}
165+ * @return a {@code Short} object holding the value
166+ * represented by the string argument in the
167+ * specified radix.
168+ * @throws NumberFormatException If the {@code String} does
169+ * not contain a parsable {@code short}.
170+ */
171+ public static Short valueOf(String s, int radix)
172+ throws NumberFormatException {
173+ return valueOf(parseShort(s, radix));
174+ }
175+
176+ /**
177+ * Returns a {@code Short} object holding the
178+ * value given by the specified {@code String}. The argument
179+ * is interpreted as representing a signed decimal
180+ * {@code short}, exactly as if the argument were given to
181+ * the {@link #parseShort(java.lang.String)} method. The result is
182+ * a {@code Short} object that represents the
183+ * {@code short} value specified by the string.
184+ *
185+ * <p>In other words, this method returns a {@code Short} object
186+ * equal to the value of:
187+ *
188+ * <blockquote>
189+ * {@code new Short(Short.parseShort(s))}
190+ * </blockquote>
191+ *
192+ * @param s the string to be parsed
193+ * @return a {@code Short} object holding the value
194+ * represented by the string argument
195+ * @throws NumberFormatException If the {@code String} does
196+ * not contain a parsable {@code short}.
197+ */
198+ public static Short valueOf(String s) throws NumberFormatException {
199+ return valueOf(s, 10);
200+ }
201+
202+ private static class ShortCache {
203+ private ShortCache(){}
204+
205+ static final Short cache[] = new Short[-(-128) + 127 + 1];
206+
207+ static {
208+ for(int i = 0; i < cache.length; i++)
209+ cache[i] = new Short((short)(i - 128));
210+ }
211+ }
212+
213+ /**
214+ * Returns a {@code Short} instance representing the specified
215+ * {@code short} value.
216+ * If a new {@code Short} instance is not required, this method
217+ * should generally be used in preference to the constructor
218+ * {@link #Short(short)}, as this method is likely to yield
219+ * significantly better space and time performance by caching
220+ * frequently requested values.
221+ *
222+ * This method will always cache values in the range -128 to 127,
223+ * inclusive, and may cache other values outside of this range.
224+ *
225+ * @param s a short value.
226+ * @return a {@code Short} instance representing {@code s}.
227+ * @since 1.5
228+ */
229+ public static Short valueOf(short s) {
230+ final int offset = 128;
231+ int sAsInt = s;
232+ if (sAsInt >= -128 && sAsInt <= 127) { // must cache
233+ return ShortCache.cache[sAsInt + offset];
234+ }
235+ return new Short(s);
236+ }
237+
238+ /**
239+ * Decodes a {@code String} into a {@code Short}.
240+ * Accepts decimal, hexadecimal, and octal numbers given by
241+ * the following grammar:
242+ *
243+ * <blockquote>
244+ * <dl>
245+ * <dt><i>DecodableString:</i>
246+ * <dd><i>Sign<sub>opt</sub> DecimalNumeral</i>
247+ * <dd><i>Sign<sub>opt</sub></i> {@code 0x} <i>HexDigits</i>
248+ * <dd><i>Sign<sub>opt</sub></i> {@code 0X} <i>HexDigits</i>
249+ * <dd><i>Sign<sub>opt</sub></i> {@code #} <i>HexDigits</i>
250+ * <dd><i>Sign<sub>opt</sub></i> {@code 0} <i>OctalDigits</i>
251+ * <p>
252+ * <dt><i>Sign:</i>
253+ * <dd>{@code -}
254+ * <dd>{@code +}
255+ * </dl>
256+ * </blockquote>
257+ *
258+ * <i>DecimalNumeral</i>, <i>HexDigits</i>, and <i>OctalDigits</i>
259+ * are as defined in section 3.10.1 of
260+ * <cite>The Java&trade; Language Specification</cite>,
261+ * except that underscores are not accepted between digits.
262+ *
263+ * <p>The sequence of characters following an optional
264+ * sign and/or radix specifier ("{@code 0x}", "{@code 0X}",
265+ * "{@code #}", or leading zero) is parsed as by the {@code
266+ * Short.parseShort} method with the indicated radix (10, 16, or
267+ * 8). This sequence of characters must represent a positive
268+ * value or a {@link NumberFormatException} will be thrown. The
269+ * result is negated if first character of the specified {@code
270+ * String} is the minus sign. No whitespace characters are
271+ * permitted in the {@code String}.
272+ *
273+ * @param nm the {@code String} to decode.
274+ * @return a {@code Short} object holding the {@code short}
275+ * value represented by {@code nm}
276+ * @throws NumberFormatException if the {@code String} does not
277+ * contain a parsable {@code short}.
278+ * @see java.lang.Short#parseShort(java.lang.String, int)
279+ */
280+ public static Short decode(String nm) throws NumberFormatException {
281+ int i = Integer.decode(nm);
282+ if (i < MIN_VALUE || i > MAX_VALUE)
283+ throw new NumberFormatException(
284+ "Value " + i + " out of range from input " + nm);
285+ return valueOf((short)i);
286+ }
287+
288+ /**
289+ * The value of the {@code Short}.
290+ *
291+ * @serial
292+ */
293+ private final short value;
294+
295+ /**
296+ * Constructs a newly allocated {@code Short} object that
297+ * represents the specified {@code short} value.
298+ *
299+ * @param value the value to be represented by the
300+ * {@code Short}.
301+ */
302+ public Short(short value) {
303+ this.value = value;
304+ }
305+
306+ /**
307+ * Constructs a newly allocated {@code Short} object that
308+ * represents the {@code short} value indicated by the
309+ * {@code String} parameter. The string is converted to a
310+ * {@code short} value in exactly the manner used by the
311+ * {@code parseShort} method for radix 10.
312+ *
313+ * @param s the {@code String} to be converted to a
314+ * {@code Short}
315+ * @throws NumberFormatException If the {@code String}
316+ * does not contain a parsable {@code short}.
317+ * @see java.lang.Short#parseShort(java.lang.String, int)
318+ */
319+ public Short(String s) throws NumberFormatException {
320+ this.value = parseShort(s, 10);
321+ }
322+
323+ /**
324+ * Returns the value of this {@code Short} as a
325+ * {@code byte}.
326+ */
327+ public byte byteValue() {
328+ return (byte)value;
329+ }
330+
331+ /**
332+ * Returns the value of this {@code Short} as a
333+ * {@code short}.
334+ */
335+ public short shortValue() {
336+ return value;
337+ }
338+
339+ /**
340+ * Returns the value of this {@code Short} as an
341+ * {@code int}.
342+ */
343+ public int intValue() {
344+ return (int)value;
345+ }
346+
347+ /**
348+ * Returns the value of this {@code Short} as a
349+ * {@code long}.
350+ */
351+ public long longValue() {
352+ return (long)value;
353+ }
354+
355+ /**
356+ * Returns the value of this {@code Short} as a
357+ * {@code float}.
358+ */
359+ public float floatValue() {
360+ return (float)value;
361+ }
362+
363+ /**
364+ * Returns the value of this {@code Short} as a
365+ * {@code double}.
366+ */
367+ public double doubleValue() {
368+ return (double)value;
369+ }
370+
371+ /**
372+ * Returns a {@code String} object representing this
373+ * {@code Short}'s value. The value is converted to signed
374+ * decimal representation and returned as a string, exactly as if
375+ * the {@code short} value were given as an argument to the
376+ * {@link java.lang.Short#toString(short)} method.
377+ *
378+ * @return a string representation of the value of this object in
379+ * base&nbsp;10.
380+ */
381+ public String toString() {
382+ return Integer.toString((int)value);
383+ }
384+
385+ /**
386+ * Returns a hash code for this {@code Short}; equal to the result
387+ * of invoking {@code intValue()}.
388+ *
389+ * @return a hash code value for this {@code Short}
390+ */
391+ public int hashCode() {
392+ return (int)value;
393+ }
394+
395+ /**
396+ * Compares this object to the specified object. The result is
397+ * {@code true} if and only if the argument is not
398+ * {@code null} and is a {@code Short} object that
399+ * contains the same {@code short} value as this object.
400+ *
401+ * @param obj the object to compare with
402+ * @return {@code true} if the objects are the same;
403+ * {@code false} otherwise.
404+ */
405+ public boolean equals(Object obj) {
406+ if (obj instanceof Short) {
407+ return value == ((Short)obj).shortValue();
408+ }
409+ return false;
410+ }
411+
412+ /**
413+ * Compares two {@code Short} objects numerically.
414+ *
415+ * @param anotherShort the {@code Short} to be compared.
416+ * @return the value {@code 0} if this {@code Short} is
417+ * equal to the argument {@code Short}; a value less than
418+ * {@code 0} if this {@code Short} is numerically less
419+ * than the argument {@code Short}; and a value greater than
420+ * {@code 0} if this {@code Short} is numerically
421+ * greater than the argument {@code Short} (signed
422+ * comparison).
423+ * @since 1.2
424+ */
425+ public int compareTo(Short anotherShort) {
426+ return compare(this.value, anotherShort.value);
427+ }
428+
429+ /**
430+ * Compares two {@code short} values numerically.
431+ * The value returned is identical to what would be returned by:
432+ * <pre>
433+ * Short.valueOf(x).compareTo(Short.valueOf(y))
434+ * </pre>
435+ *
436+ * @param x the first {@code short} to compare
437+ * @param y the second {@code short} to compare
438+ * @return the value {@code 0} if {@code x == y};
439+ * a value less than {@code 0} if {@code x < y}; and
440+ * a value greater than {@code 0} if {@code x > y}
441+ * @since 1.7
442+ */
443+ public static int compare(short x, short y) {
444+ return x - y;
445+ }
446+
447+ /**
448+ * The number of bits used to represent a {@code short} value in two's
449+ * complement binary form.
450+ * @since 1.5
451+ */
452+ public static final int SIZE = 16;
453+
454+ /**
455+ * Returns the value obtained by reversing the order of the bytes in the
456+ * two's complement representation of the specified {@code short} value.
457+ *
458+ * @return the value obtained by reversing (or, equivalently, swapping)
459+ * the bytes in the specified {@code short} value.
460+ * @since 1.5
461+ */
462+ public static short reverseBytes(short i) {
463+ return (short) (((i & 0xFF00) >> 8) | (i << 8));
464+ }
465+
466+ /** use serialVersionUID from JDK 1.1. for interoperability */
467+ private static final long serialVersionUID = 7515723908773894738L;
468+}