--- /dev/null
+/* Byte.java -- object wrapper for byte
+ Copyright (C) 1998, 2001, 2002, 2005 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING. If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library. Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module. An independent module is a module which is not derived from
+or based on this library. If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so. If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package java.lang;
+
+/**
+ * Instances of class <code>Byte</code> represent primitive <code>byte</code>
+ * values.
+ *
+ * Additionally, this class provides various helper functions and variables
+ * useful to bytes.
+ *
+ * @author Paul Fisher
+ * @author John Keiser
+ * @author Per Bothner
+ * @author Eric Blake (ebb9@email.byu.edu)
+ * @since 1.1
+ * @status updated to 1.4
+ */
+public final class Byte extends Number implements Comparable
+{
+ /**
+ * Compatible with JDK 1.1+.
+ */
+ private static final long serialVersionUID = -7183698231559129828L;
+
+ /**
+ * The minimum value a <code>byte</code> can represent is -128 (or
+ * -2<sup>7</sup>).
+ */
+ public static final byte MIN_VALUE = -128;
+
+ /**
+ * The maximum value a <code>byte</code> can represent is 127 (or
+ * 2<sup>7</sup> - 1).
+ */
+ public static final byte MAX_VALUE = 127;
+
+ /**
+ * The primitive type <code>byte</code> is represented by this
+ * <code>Class</code> object.
+ */
+ public static final Class TYPE = VMClassLoader.getPrimitiveClass('B');
+
+ /**
+ * The immutable value of this Byte.
+ *
+ * @serial the wrapped byte
+ */
+ private final byte value;
+
+ /**
+ * Create a <code>Byte</code> object representing the value of the
+ * <code>byte</code> argument.
+ *
+ * @param value the value to use
+ */
+ public Byte(byte value)
+ {
+ this.value = value;
+ }
+
+ /**
+ * Create a <code>Byte</code> object representing the value specified
+ * by the <code>String</code> argument
+ *
+ * @param s the string to convert
+ * @throws NumberFormatException if the String does not contain a byte
+ * @see #valueOf(String)
+ */
+ public Byte(String s)
+ {
+ value = parseByte(s, 10);
+ }
+
+ /**
+ * Converts the <code>byte</code> to a <code>String</code> and assumes
+ * a radix of 10.
+ *
+ * @param b the <code>byte</code> to convert to <code>String</code>
+ * @return the <code>String</code> representation of the argument
+ */
+ public static String toString(byte b)
+ {
+ return String.valueOf(b);
+ }
+
+ /**
+ * Converts the specified <code>String</code> into a <code>byte</code>.
+ * This function assumes a radix of 10.
+ *
+ * @param s the <code>String</code> to convert
+ * @return the <code>byte</code> value of <code>s</code>
+ * @throws NumberFormatException if <code>s</code> cannot be parsed as a
+ * <code>byte</code>
+ * @see #parseByte(String)
+ */
+ public static byte parseByte(String s)
+ {
+ return parseByte(s, 10);
+ }
+
+ /**
+ * Converts the specified <code>String</code> into an <code>int</code>
+ * using the specified radix (base). The string must not be <code>null</code>
+ * or empty. It may begin with an optional '-', which will negate the answer,
+ * provided that there are also valid digits. Each digit is parsed as if by
+ * <code>Character.digit(d, radix)</code>, and must be in the range
+ * <code>0</code> to <code>radix - 1</code>. Finally, the result must be
+ * within <code>MIN_VALUE</code> to <code>MAX_VALUE</code>, inclusive.
+ * Unlike Double.parseDouble, you may not have a leading '+'.
+ *
+ * @param s the <code>String</code> to convert
+ * @param radix the radix (base) to use in the conversion
+ * @return the <code>String</code> argument converted to <code>byte</code>
+ * @throws NumberFormatException if <code>s</code> cannot be parsed as a
+ * <code>byte</code>
+ */
+ public static byte parseByte(String s, int radix)
+ {
+ int i = Integer.parseInt(s, radix, false);
+ if ((byte) i != i)
+ throw new NumberFormatException();
+ return (byte) i;
+ }
+
+ /**
+ * Creates a new <code>Byte</code> object using the <code>String</code>
+ * and specified radix (base).
+ *
+ * @param s the <code>String</code> to convert
+ * @param radix the radix (base) to convert with
+ * @return the new <code>Byte</code>
+ * @throws NumberFormatException if <code>s</code> cannot be parsed as a
+ * <code>byte</code>
+ * @see #parseByte(String, int)
+ */
+ public static Byte valueOf(String s, int radix)
+ {
+ return new Byte(parseByte(s, radix));
+ }
+
+ /**
+ * Creates a new <code>Byte</code> object using the <code>String</code>,
+ * assuming a radix of 10.
+ *
+ * @param s the <code>String</code> to convert
+ * @return the new <code>Byte</code>
+ * @throws NumberFormatException if <code>s</code> cannot be parsed as a
+ * <code>byte</code>
+ * @see #Byte(String)
+ * @see #parseByte(String)
+ */
+ public static Byte valueOf(String s)
+ {
+ return new Byte(parseByte(s, 10));
+ }
+
+ /**
+ * Convert the specified <code>String</code> into a <code>Byte</code>.
+ * The <code>String</code> may represent decimal, hexadecimal, or
+ * octal numbers.
+ *
+ * <p>The extended BNF grammar is as follows:<br>
+ * <pre>
+ * <em>DecodableString</em>:
+ * ( [ <code>-</code> ] <em>DecimalNumber</em> )
+ * | ( [ <code>-</code> ] ( <code>0x</code> | <code>0X</code>
+ * | <code>#</code> ) { <em>HexDigit</em> }+ )
+ * | ( [ <code>-</code> ] <code>0</code> { <em>OctalDigit</em> } )
+ * <em>DecimalNumber</em>:
+ * <em>DecimalDigit except '0'</em> { <em>DecimalDigit</em> }
+ * <em>DecimalDigit</em>:
+ * <em>Character.digit(d, 10) has value 0 to 9</em>
+ * <em>OctalDigit</em>:
+ * <em>Character.digit(d, 8) has value 0 to 7</em>
+ * <em>DecimalDigit</em>:
+ * <em>Character.digit(d, 16) has value 0 to 15</em>
+ * </pre>
+ * Finally, the value must be in the range <code>MIN_VALUE</code> to
+ * <code>MAX_VALUE</code>, or an exception is thrown.
+ *
+ * @param s the <code>String</code> to interpret
+ * @return the value of the String as a <code>Byte</code>
+ * @throws NumberFormatException if <code>s</code> cannot be parsed as a
+ * <code>byte</code>
+ * @throws NullPointerException if <code>s</code> is null
+ * @see Integer#decode(String)
+ */
+ public static Byte decode(String s)
+ {
+ int i = Integer.parseInt(s, 10, true);
+ if ((byte) i != i)
+ throw new NumberFormatException();
+ return new Byte((byte) i);
+ }
+
+ /**
+ * Return the value of this <code>Byte</code>.
+ *
+ * @return the byte value
+ */
+ public byte byteValue()
+ {
+ return value;
+ }
+
+ /**
+ * Return the value of this <code>Byte</code> as a <code>short</code>.
+ *
+ * @return the short value
+ */
+ public short shortValue()
+ {
+ return value;
+ }
+
+ /**
+ * Return the value of this <code>Byte</code> as an <code>int</code>.
+ *
+ * @return the int value
+ */
+ public int intValue()
+ {
+ return value;
+ }
+
+ /**
+ * Return the value of this <code>Byte</code> as a <code>long</code>.
+ *
+ * @return the long value
+ */
+ public long longValue()
+ {
+ return value;
+ }
+
+ /**
+ * Return the value of this <code>Byte</code> as a <code>float</code>.
+ *
+ * @return the float value
+ */
+ public float floatValue()
+ {
+ return value;
+ }
+
+ /**
+ * Return the value of this <code>Byte</code> as a <code>double</code>.
+ *
+ * @return the double value
+ */
+ public double doubleValue()
+ {
+ return value;
+ }
+
+ /**
+ * Converts the <code>Byte</code> value to a <code>String</code> and
+ * assumes a radix of 10.
+ *
+ * @return the <code>String</code> representation of this <code>Byte</code>
+ * @see Integer#toString()
+ */
+ public String toString()
+ {
+ return String.valueOf(value);
+ }
+
+ /**
+ * Return a hashcode representing this Object. <code>Byte</code>'s hash
+ * code is simply its value.
+ *
+ * @return this Object's hash code
+ */
+ public int hashCode()
+ {
+ return value;
+ }
+
+ /**
+ * Returns <code>true</code> if <code>obj</code> is an instance of
+ * <code>Byte</code> and represents the same byte value.
+ *
+ * @param obj the object to compare
+ * @return whether these Objects are semantically equal
+ */
+ public boolean equals(Object obj)
+ {
+ return obj instanceof Byte && value == ((Byte) obj).value;
+ }
+
+ /**
+ * Compare two Bytes numerically by comparing their <code>byte</code> values.
+ * The result is positive if the first is greater, negative if the second
+ * is greater, and 0 if the two are equal.
+ *
+ * @param b the Byte to compare
+ * @return the comparison
+ * @since 1.2
+ */
+ public int compareTo(Byte b)
+ {
+ return value - b.value;
+ }
+
+ /**
+ * Behaves like <code>compareTo(Byte)</code> unless the Object
+ * is not a <code>Byte</code>.
+ *
+ * @param o the object to compare
+ * @return the comparison
+ * @throws ClassCastException if the argument is not a <code>Byte</code>
+ * @see #compareTo(Byte)
+ * @see Comparable
+ * @since 1.2
+ */
+ public int compareTo(Object o)
+ {
+ return compareTo((Byte) o);
+ }
+}
OSDN Git Service
