File	Doc	Category	Size	Date	Package
Byte.java	API Doc	Java SE 5 API	15623	Fri Aug 26 14:57:00 BST 2005	java.lang

Byte

• java.lang.Object
  • java.lang.Number

Fields Summary
public static final byte	MIN_VALUE A constant holding the minimum value a byte can have, -27.
public static final byte	MAX_VALUE A constant holding the maximum value a byte can have, 27-1.
public static final Class	TYPE The Class instance representing the primitive type byte.
private final byte	value The value of the Byte.
public static final int	SIZE The number of bits used to represent a byte value in two's complement binary form.
private static final long	serialVersionUID use serialVersionUID from JDK 1.1. for interoperability

Constructors Summary
public Byte(byte value) Constructs a newly allocated Byte object that represents the specified byte value. param value the value to be represented by the Byte. this.value = value;
public Byte(String s) Constructs a newly allocated Byte object that represents the byte value indicated by the String parameter. The string is converted to a byte value in exactly the manner used by the parseByte method for radix 10. param s the String to be converted to a Byte exception NumberFormatException If the String does not contain a parsable byte. see java.lang.Byte#parseByte(java.lang.String, int) this.value = parseByte(s, 10);

Methods Summary
public byte	byteValue() Returns the value of this Byte as a byte. return value;
public int	compareTo(java.lang.Byte anotherByte) Compares two Byte objects numerically. param anotherByte the Byte to be compared. return the value 0 if this Byte is equal to the argument Byte; a value less than 0 if this Byte is numerically less than the argument Byte; and a value greater than 0 if this Byte is numerically greater than the argument Byte (signed comparison). since 1.2 return this.value - anotherByte.value;
public static java.lang.Byte	decode(java.lang.String nm) Decodes a String into a Byte. Accepts decimal, hexadecimal, and octal numbers given by the following grammar: DecodableString: Signopt DecimalNumeral Signopt 0x HexDigits Signopt 0X HexDigits Signopt # HexDigits Signopt 0 OctalDigits Sign: - DecimalNumeral, HexDigits, and OctalDigits are defined in §3.10.1 of the Java Language Specification. The sequence of characters following an (optional) negative sign and/or radix specifier ("0x", "0X", "#", or leading zero) is parsed as by the Byte.parseByte method with the indicated radix (10, 16, or 8). This sequence of characters must represent a positive value or a {@link NumberFormatException} will be thrown. The result is negated if first character of the specified String is the minus sign. No whitespace characters are permitted in the String. param nm the String to decode. return a Byte object holding the byte value represented by nm exception NumberFormatException if the String does not contain a parsable byte. see java.lang.Byte#parseByte(java.lang.String, int) int radix = 10; int index = 0; boolean negative = false; Byte result; // Handle minus sign, if present if (nm.startsWith("-")) { negative = true; index++; } if (nm.startsWith("0x", index) || nm.startsWith("0X", index)) { index += 2; radix = 16; } else if (nm.startsWith("#", index)) { index++; radix = 16; } else if (nm.startsWith("0", index) && nm.length() > 1 + index) { index++; radix = 8; } if (nm.startsWith("-", index)) throw new NumberFormatException("Negative sign in wrong position"); try { result = Byte.valueOf(nm.substring(index), radix); result = negative ? new Byte((byte)-result.byteValue()) : result; } catch (NumberFormatException e) { // If number is Byte.MIN_VALUE, we'll end up here. The next line // handles this case, and causes any genuine format error to be // rethrown. String constant = negative ? new String("-" + nm.substring(index)) : nm.substring(index); result = Byte.valueOf(constant, radix); } return result;
public double	doubleValue() Returns the value of this Byte as a double. return (double)value;
public boolean	equals(java.lang.Object obj) Compares this object to the specified object. The result is true if and only if the argument is not null and is a Byte object that contains the same byte value as this object. param obj the object to compare with return true if the objects are the same; false otherwise. if (obj instanceof Byte) { return value == ((Byte)obj).byteValue(); } return false;
public float	floatValue() Returns the value of this Byte as a float. return (float)value;
public int	hashCode() Returns a hash code for this Byte. return (int)value;
public int	intValue() Returns the value of this Byte as an int. return (int)value;
public long	longValue() Returns the value of this Byte as a long. return (long)value;
public static byte	parseByte(java.lang.String s) Parses the string argument as a signed decimal byte. The characters in the string must all be decimal digits, except that the first character may be an ASCII minus sign '-' ('\u002D') to indicate a negative value. The resulting byte value is returned, exactly as if the argument and the radix 10 were given as arguments to the {@link #parseByte(java.lang.String, int)} method. param s a String containing the byte representation to be parsed return the byte value represented by the argument in decimal exception NumberFormatException if the string does not contain a parsable byte. return parseByte(s, 10);
public static byte	parseByte(java.lang.String s, int radix) Parses the string argument as a signed byte in the radix specified by the second argument. The characters in the string must all be digits, of the specified radix (as determined by whether {@link java.lang.Character#digit(char, int)} returns a nonnegative value) except that the first character may be an ASCII minus sign '-' ('\u002D') to indicate a negative value. The resulting byte value is returned. An exception of type NumberFormatException is thrown if any of the following situations occurs: The first argument is null or is a string of length zero. The radix is either smaller than {@link java.lang.Character#MIN_RADIX} or larger than {@link java.lang.Character#MAX_RADIX}. Any character of the string is not a digit of the specified radix, except that the first character may be a minus sign '-' ('\u002D') provided that the string is longer than length 1. The value represented by the string is not a value of type byte. param s the String containing the byte representation to be parsed param radix the radix to be used while parsing s return the byte value represented by the string argument in the specified radix exception NumberFormatException If the string does not contain a parsable byte. int i = Integer.parseInt(s, radix); if (i < MIN_VALUE || i > MAX_VALUE) throw new NumberFormatException( "Value out of range. Value:\"" + s + "\" Radix:" + radix); return (byte)i;
public short	shortValue() Returns the value of this Byte as a short. return (short)value;
public static java.lang.String	toString(byte b) Returns a new String object representing the specified byte. The radix is assumed to be 10. param b the byte to be converted return the string representation of the specified byte see java.lang.Integer#toString(int) return Integer.toString((int)b, 10);
public java.lang.String	toString() Returns a String object representing this Byte's value. The value is converted to signed decimal representation and returned as a string, exactly as if the byte value were given as an argument to the {@link java.lang.Byte#toString(byte)} method. return a string representation of the value of this object in base 10. return String.valueOf((int)value);
public static java.lang.Byte	valueOf(byte b) Returns a Byte instance representing the specified byte value. If a new Byte instance is not required, this method should generally be used in preference to the constructor {@link #Byte(byte)}, as this method is likely to yield significantly better space and time performance by caching frequently requested values. param b a byte value. return a Byte instance representing b. since 1.5 for(int i = 0; i < cache.length; i++) cache[i] = new Byte((byte)(i - 128)); final int offset = 128; return ByteCache.cache[(int)b + offset];
public static java.lang.Byte	valueOf(java.lang.String s, int radix) Returns a Byte object holding the value extracted from the specified String when parsed with the radix given by the second argument. The first argument is interpreted as representing a signed byte in the radix specified by the second argument, exactly as if the argument were given to the {@link #parseByte(java.lang.String, int)} method. The result is a Byte object that represents the byte value specified by the string. In other words, this method returns a Byte object equal to the value of: new Byte(Byte.parseByte(s, radix)) param s the string to be parsed param radix the radix to be used in interpreting s return a Byte object holding the value represented by the string argument in the specified radix. exception NumberFormatException If the String does not contain a parsable byte. return new Byte(parseByte(s, radix));
public static java.lang.Byte	valueOf(java.lang.String s) Returns a Byte object holding the value given by the specified String. The argument is interpreted as representing a signed decimal byte, exactly as if the argument were given to the {@link #parseByte(java.lang.String)} method. The result is a Byte object that represents the byte value specified by the string. In other words, this method returns a Byte object equal to the value of: new Byte(Byte.parseByte(s)) param s the string to be parsed return a Byte object holding the value represented by the string argument exception NumberFormatException If the String does not contain a parsable byte. return valueOf(s, 10);