History

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

Showing the changes to java/pkg/java/lang/Boolean.java (1 of 18352 files). Show all

Unified · Split

java/pkg/java/lang/Boolean.java+282−0
@@ -0,0 +1,282 @@
1+/*
2+ * Copyright (c) 1994, 2006, 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 Boolean class wraps a value of the primitive type
30+ * {@code boolean} in an object. An object of type
31+ * {@code Boolean} contains a single field whose type is
32+ * {@code boolean}.
33+ * <p>
34+ * In addition, this class provides many methods for
35+ * converting a {@code boolean} to a {@code String} and a
36+ * {@code String} to a {@code boolean}, as well as other
37+ * constants and methods useful when dealing with a
38+ * {@code boolean}.
39+ *
40+ * @author Arthur van Hoff
41+ * @since JDK1.0
42+ */
43+public final class Boolean implements java.io.Serializable,
44+ Comparable<Boolean>
45+{
46+ /**
47+ * The {@code Boolean} object corresponding to the primitive
48+ * value {@code true}.
49+ */
50+ public static final Boolean TRUE = new Boolean(true);
51+
52+ /**
53+ * The {@code Boolean} object corresponding to the primitive
54+ * value {@code false}.
55+ */
56+ public static final Boolean FALSE = new Boolean(false);
57+
58+ /**
59+ * The Class object representing the primitive type boolean.
60+ *
61+ * @since JDK1.1
62+ */
63+ public static final Class<Boolean> TYPE = Class.getPrimitiveClass("boolean");
64+
65+ /**
66+ * The value of the Boolean.
67+ *
68+ * @serial
69+ */
70+ private final boolean value;
71+
72+ /** use serialVersionUID from JDK 1.0.2 for interoperability */
73+ private static final long serialVersionUID = -3665804199014368530L;
74+
75+ /**
76+ * Allocates a {@code Boolean} object representing the
77+ * {@code value} argument.
78+ *
79+ * <p><b>Note: It is rarely appropriate to use this constructor.
80+ * Unless a <i>new</i> instance is required, the static factory
81+ * {@link #valueOf(boolean)} is generally a better choice. It is
82+ * likely to yield significantly better space and time performance.</b>
83+ *
84+ * @param value the value of the {@code Boolean}.
85+ */
86+ public Boolean(boolean value) {
87+ this.value = value;
88+ }
89+
90+ /**
91+ * Allocates a {@code Boolean} object representing the value
92+ * {@code true} if the string argument is not {@code null}
93+ * and is equal, ignoring case, to the string {@code "true"}.
94+ * Otherwise, allocate a {@code Boolean} object representing the
95+ * value {@code false}. Examples:<p>
96+ * {@code new Boolean("True")} produces a {@code Boolean} object
97+ * that represents {@code true}.<br>
98+ * {@code new Boolean("yes")} produces a {@code Boolean} object
99+ * that represents {@code false}.
100+ *
101+ * @param s the string to be converted to a {@code Boolean}.
102+ */
103+ public Boolean(String s) {
104+ this(toBoolean(s));
105+ }
106+
107+ /**
108+ * Parses the string argument as a boolean. The {@code boolean}
109+ * returned represents the value {@code true} if the string argument
110+ * is not {@code null} and is equal, ignoring case, to the string
111+ * {@code "true"}. <p>
112+ * Example: {@code Boolean.parseBoolean("True")} returns {@code true}.<br>
113+ * Example: {@code Boolean.parseBoolean("yes")} returns {@code false}.
114+ *
115+ * @param s the {@code String} containing the boolean
116+ * representation to be parsed
117+ * @return the boolean represented by the string argument
118+ * @since 1.5
119+ */
120+ public static boolean parseBoolean(String s) {
121+ return toBoolean(s);
122+ }
123+
124+ /**
125+ * Returns the value of this {@code Boolean} object as a boolean
126+ * primitive.
127+ *
128+ * @return the primitive {@code boolean} value of this object.
129+ */
130+ public boolean booleanValue() {
131+ return value;
132+ }
133+
134+ /**
135+ * Returns a {@code Boolean} instance representing the specified
136+ * {@code boolean} value. If the specified {@code boolean} value
137+ * is {@code true}, this method returns {@code Boolean.TRUE};
138+ * if it is {@code false}, this method returns {@code Boolean.FALSE}.
139+ * If a new {@code Boolean} instance is not required, this method
140+ * should generally be used in preference to the constructor
141+ * {@link #Boolean(boolean)}, as this method is likely to yield
142+ * significantly better space and time performance.
143+ *
144+ * @param b a boolean value.
145+ * @return a {@code Boolean} instance representing {@code b}.
146+ * @since 1.4
147+ */
148+ public static Boolean valueOf(boolean b) {
149+ return (b ? TRUE : FALSE);
150+ }
151+
152+ /**
153+ * Returns a {@code Boolean} with a value represented by the
154+ * specified string. The {@code Boolean} returned represents a
155+ * true value if the string argument is not {@code null}
156+ * and is equal, ignoring case, to the string {@code "true"}.
157+ *
158+ * @param s a string.
159+ * @return the {@code Boolean} value represented by the string.
160+ */
161+ public static Boolean valueOf(String s) {
162+ return toBoolean(s) ? TRUE : FALSE;
163+ }
164+
165+ /**
166+ * Returns a {@code String} object representing the specified
167+ * boolean. If the specified boolean is {@code true}, then
168+ * the string {@code "true"} will be returned, otherwise the
169+ * string {@code "false"} will be returned.
170+ *
171+ * @param b the boolean to be converted
172+ * @return the string representation of the specified {@code boolean}
173+ * @since 1.4
174+ */
175+ public static String toString(boolean b) {
176+ return b ? "true" : "false";
177+ }
178+
179+ /**
180+ * Returns a {@code String} object representing this Boolean's
181+ * value. If this object represents the value {@code true},
182+ * a string equal to {@code "true"} is returned. Otherwise, a
183+ * string equal to {@code "false"} is returned.
184+ *
185+ * @return a string representation of this object.
186+ */
187+ public String toString() {
188+ return value ? "true" : "false";
189+ }
190+
191+ /**
192+ * Returns a hash code for this {@code Boolean} object.
193+ *
194+ * @return the integer {@code 1231} if this object represents
195+ * {@code true}; returns the integer {@code 1237} if this
196+ * object represents {@code false}.
197+ */
198+ public int hashCode() {
199+ return value ? 1231 : 1237;
200+ }
201+
202+ /**
203+ * Returns {@code true} if and only if the argument is not
204+ * {@code null} and is a {@code Boolean} object that
205+ * represents the same {@code boolean} value as this object.
206+ *
207+ * @param obj the object to compare with.
208+ * @return {@code true} if the Boolean objects represent the
209+ * same value; {@code false} otherwise.
210+ */
211+ public boolean equals(Object obj) {
212+ if (obj instanceof Boolean) {
213+ return value == ((Boolean)obj).booleanValue();
214+ }
215+ return false;
216+ }
217+
218+ /**
219+ * Returns {@code true} if and only if the system property
220+ * named by the argument exists and is equal to the string
221+ * {@code "true"}. (Beginning with version 1.0.2 of the
222+ * Java<small><sup>TM</sup></small> platform, the test of
223+ * this string is case insensitive.) A system property is accessible
224+ * through {@code getProperty}, a method defined by the
225+ * {@code System} class.
226+ * <p>
227+ * If there is no property with the specified name, or if the specified
228+ * name is empty or null, then {@code false} is returned.
229+ *
230+ * @param name the system property name.
231+ * @return the {@code boolean} value of the system property.
232+ * @see java.lang.System#getProperty(java.lang.String)
233+ * @see java.lang.System#getProperty(java.lang.String, java.lang.String)
234+ */
235+ public static boolean getBoolean(String name) {
236+ boolean result = false;
237+ try {
238+ result = toBoolean(System.getProperty(name));
239+ } catch (IllegalArgumentException e) {
240+ } catch (NullPointerException e) {
241+ }
242+ return result;
243+ }
244+
245+ /**
246+ * Compares this {@code Boolean} instance with another.
247+ *
248+ * @param b the {@code Boolean} instance to be compared
249+ * @return zero if this object represents the same boolean value as the
250+ * argument; a positive value if this object represents true
251+ * and the argument represents false; and a negative value if
252+ * this object represents false and the argument represents true
253+ * @throws NullPointerException if the argument is {@code null}
254+ * @see Comparable
255+ * @since 1.5
256+ */
257+ public int compareTo(Boolean b) {
258+ return compare(this.value, b.value);
259+ }
260+
261+ /**
262+ * Compares two {@code boolean} values.
263+ * The value returned is identical to what would be returned by:
264+ * <pre>
265+ * Boolean.valueOf(x).compareTo(Boolean.valueOf(y))
266+ * </pre>
267+ *
268+ * @param x the first {@code boolean} to compare
269+ * @param y the second {@code boolean} to compare
270+ * @return the value {@code 0} if {@code x == y};
271+ * a value less than {@code 0} if {@code !x && y}; and
272+ * a value greater than {@code 0} if {@code x && !y}
273+ * @since 1.7
274+ */
275+ public static int compare(boolean x, boolean y) {
276+ return (x == y) ? 0 : (x ? 1 : -1);
277+ }
278+
279+ private static boolean toBoolean(String name) {
280+ return ((name != null) && name.equalsIgnoreCase("true"));
281+ }
282+}