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FlexDoc/Javadoc 2.0 Demo Java Doc |
In addition, this class provides several methods for converting an int to a String and a String to an int, as well as other constants and methods useful when dealing with an int.
This is a value-based class; programmers should treat instances that are equal as interchangeable and should not use instances for synchronization, or unpredictable behavior may occur. For example, in a future release, synchronization may fail.
Implementation note: The implementations of the "bit twiddling" methods (such as highestOneBit and numberOfTrailingZeros) are based on material from Henry S. Warren, Jr.'s Hacker's Delight, (Addison Wesley, 2002).
Field Summary |
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static final int |
The number of bytes used to represent an int value in two's
complement binary form.
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static final int |
A constant holding the maximum value an int can
have, 231-1.
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static final int |
A constant holding the minimum value an int can
have, -231.
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static final int |
The number of bits used to represent an int value in two's
complement binary form.
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The Class instance representing the primitive type
int.
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Constructor Summary |
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Integer(int value)
Deprecated, for removal. It is rarely appropriate to use this constructor.
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Deprecated, for removal. It is rarely appropriate to use this constructor.
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Method Summary |
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static int |
bitCount(int i)
Returns the number of one-bits in the two's complement binary
representation of the specified int value.
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byte |
Returns the value of this Integer as a byte
after a narrowing primitive conversion.
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static int |
compare(int x, int y)
Compares two int values numerically.
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int |
Compares two Integer objects numerically.
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static int |
compareUnsigned(int x, int y)
Compares two int values numerically treating the values
as unsigned.
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static Integer |
Decodes a String into an Integer.
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Returns an Optional containing the nominal descriptor for this
instance, which is the instance itself.
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static int |
divideUnsigned(int dividend, int divisor)
Returns the unsigned quotient of dividing the first argument by
the second where each argument and the result is interpreted as
an unsigned value.
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double |
Returns the value of this Integer as a double
after a widening primitive conversion.
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boolean |
Compares this object to the specified object.
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float |
Returns the value of this Integer as a float
after a widening primitive conversion.
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static Integer |
getInteger(String nm)
Determines the integer value of the system property with the
specified name.
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static Integer |
getInteger(String nm, int val)
Determines the integer value of the system property with the
specified name.
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static Integer |
Returns the integer value of the system property with the
specified name.
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int |
hashCode()
Returns a hash code for this Integer.
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static int |
hashCode(int value)
Returns a hash code for an int value; compatible with
Integer.hashCode().
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static int |
highestOneBit(int i)
Returns an int value with at most a single one-bit, in the
position of the highest-order ("leftmost") one-bit in the specified
int value.
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int |
intValue()
Returns the value of this Integer as an
int.
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long |
Returns the value of this Integer as a long
after a widening primitive conversion.
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static int |
lowestOneBit(int i)
Returns an int value with at most a single one-bit, in the
position of the lowest-order ("rightmost") one-bit in the specified
int value.
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static int |
max(int a, int b)
Returns the greater of two int values
as if by calling Math.max.
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static int |
min(int a, int b)
Returns the smaller of two int values
as if by calling Math.min.
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static int |
numberOfLeadingZeros(int i)
Returns the number of zero bits preceding the highest-order
("leftmost") one-bit in the two's complement binary representation
of the specified int value.
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static int |
numberOfTrailingZeros(int i)
Returns the number of zero bits following the lowest-order ("rightmost")
one-bit in the two's complement binary representation of the specified
int value.
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static int |
parseInt(CharSequence s, int beginIndex, int endIndex, int radix)
Parses the CharSequence argument as a signed int in the
specified radix, beginning at the specified beginIndex
and extending to endIndex - 1.
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static int |
Parses the string argument as a signed decimal integer.
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static int |
Parses the string argument as a signed integer in the radix
specified by the second argument.
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static int |
parseUnsignedInt(CharSequence s, int beginIndex, int endIndex, int radix)
Parses the CharSequence argument as an unsigned int in
the specified radix, beginning at the specified
beginIndex and extending to endIndex - 1.
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static int |
Parses the string argument as an unsigned decimal integer.
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static int |
parseUnsignedInt(String s, int radix)
Parses the string argument as an unsigned integer in the radix
specified by the second argument.
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static int |
remainderUnsigned(int dividend, int divisor)
Returns the unsigned remainder from dividing the first argument
by the second where each argument and the result is interpreted
as an unsigned value.
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Resolves this instance as a ConstantDesc, the result of which is
the instance itself.
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static int |
reverse(int i)
Returns the value obtained by reversing the order of the bits in the
two's complement binary representation of the specified int
value.
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static int |
reverseBytes(int i)
Returns the value obtained by reversing the order of the bytes in the
two's complement representation of the specified int value.
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static int |
rotateLeft(int i, int distance)
Returns the value obtained by rotating the two's complement binary
representation of the specified int value left by the
specified number of bits.
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static int |
rotateRight(int i, int distance)
Returns the value obtained by rotating the two's complement binary
representation of the specified int value right by the
specified number of bits.
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short |
Returns the value of this Integer as a short
after a narrowing primitive conversion.
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static int |
signum(int i)
Returns the signum function of the specified int value.
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static int |
sum(int a, int b)
Adds two integers together as per the + operator.
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static String |
toBinaryString(int i)
Returns a string representation of the integer argument as an
unsigned integer in base 2.
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static String |
toHexString(int i)
Returns a string representation of the integer argument as an
unsigned integer in base 16.
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static String |
toOctalString(int i)
Returns a string representation of the integer argument as an
unsigned integer in base 8.
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toString()
Returns a String object representing this
Integer's value.
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static String |
toString(int i)
Returns a String object representing the
specified integer.
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static String |
toString(int i, int radix)
Returns a string representation of the first argument in the
radix specified by the second argument.
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static long |
toUnsignedLong(int x)
Converts the argument to a long by an unsigned
conversion.
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static String |
toUnsignedString(int i)
Returns a string representation of the argument as an unsigned
decimal value.
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static String |
toUnsignedString(int i, int radix)
Returns a string representation of the first argument as an
unsigned integer value in the radix specified by the second
argument.
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static Integer |
valueOf(int i)
Returns an Integer instance representing the specified
int value.
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static Integer |
Returns an Integer object holding the
value of the specified String.
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static Integer |
Returns an Integer object holding the value
extracted from the specified String when parsed
with the radix given by the second argument.
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Methods inherited from class java.lang.Object |
public Integer |
(int value) |
public Integer |
(String s) |
throws |
public static String toString |
(int i, int radix) |
If the radix is smaller than Character.MIN_RADIX or larger than Character.MAX_RADIX, then the radix 10 is used instead.
If the first argument is negative, the first element of the result is the ASCII minus character '-' ('\u002D'). If the first argument is not negative, no sign character appears in the result.
The remaining characters of the result represent the magnitude of the first argument. If the magnitude is zero, it is represented by a single zero character '0' ('\u0030'); otherwise, the first character of the representation of the magnitude will not be the zero character. The following ASCII characters are used as digits:
0123456789abcdefghijklmnopqrstuvwxyzThese are '\u0030' through '\u0039' and '\u0061' through '\u007A'. If radix is N, then the first N of these characters are used as radix-N digits in the order shown. Thus, the digits for hexadecimal (radix 16) are 0123456789abcdef. If uppercase letters are desired, the String.toUpperCase() method may be called on the result:
Integer.toString(n, 16).toUpperCase()
public static String toUnsignedString |
(int i, int radix) |
If the radix is smaller than Character.MIN_RADIX or larger than Character.MAX_RADIX, then the radix 10 is used instead.
Note that since the first argument is treated as an unsigned value, no leading sign character is printed.
If the magnitude is zero, it is represented by a single zero character '0' ('\u0030'); otherwise, the first character of the representation of the magnitude will not be the zero character.
The behavior of radixes and the characters used as digits are the same as toString.
public static String toHexString |
(int i) |
The unsigned integer value is the argument plus 232 if the argument is negative; otherwise, it is equal to the argument. This value is converted to a string of ASCII digits in hexadecimal (base 16) with no extra leading 0s.
The value of the argument can be recovered from the returned string s by calling Integer.parseUnsignedInt(s, 16).
If the unsigned magnitude is zero, it is represented by a single zero character '0' ('\u0030'); otherwise, the first character of the representation of the unsigned magnitude will not be the zero character. The following characters are used as hexadecimal digits:
0123456789abcdefThese are the characters '\u0030' through '\u0039' and '\u0061' through '\u0066'. If uppercase letters are desired, the String.toUpperCase() method may be called on the result:
Integer.toHexString(n).toUpperCase()
public static String toOctalString |
(int i) |
The unsigned integer value is the argument plus 232 if the argument is negative; otherwise, it is equal to the argument. This value is converted to a string of ASCII digits in octal (base 8) with no extra leading 0s.
The value of the argument can be recovered from the returned string s by calling Integer.parseUnsignedInt(s, 8).
If the unsigned magnitude is zero, it is represented by a single zero character '0' ('\u0030'); otherwise, the first character of the representation of the unsigned magnitude will not be the zero character. The following characters are used as octal digits:
01234567These are the characters '\u0030' through '\u0037'.
public static String toBinaryString |
(int i) |
The unsigned integer value is the argument plus 232 if the argument is negative; otherwise it is equal to the argument. This value is converted to a string of ASCII digits in binary (base 2) with no extra leading 0s.
The value of the argument can be recovered from the returned string s by calling Integer.parseUnsignedInt(s, 2).
If the unsigned magnitude is zero, it is represented by a single zero character '0' ('\u0030'); otherwise, the first character of the representation of the unsigned magnitude will not be the zero character. The characters '0' ('\u0030') and '1' ('\u0031') are used as binary digits.
public static String toString |
(int i) |
public static String toUnsignedString |
(int i) |
public static int parseInt |
(String s, int radix) |
throws |
An exception of type NumberFormatException is thrown if any of the following situations occurs:
Examples:
parseInt("0", 10) returns 0 parseInt("473", 10) returns 473 parseInt("+42", 10) returns 42 parseInt("-0", 10) returns 0 parseInt("-FF", 16) returns -255 parseInt("1100110", 2) returns 102 parseInt("2147483647", 10) returns 2147483647 parseInt("-2147483648", 10) returns -2147483648 parseInt("2147483648", 10) throws a NumberFormatException parseInt("99", 8) throws a NumberFormatException parseInt("Kona", 10) throws a NumberFormatException parseInt("Kona", 27) returns 411787
public static int parseInt |
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throws |
The method does not take steps to guard against the CharSequence being mutated while parsing.
public static int parseInt |
(String s) |
throws |
public static int parseUnsignedInt |
(String s, int radix) |
throws |
An exception of type NumberFormatException is thrown if any of the following situations occurs:
public static int parseUnsignedInt |
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throws |
The method does not take steps to guard against the CharSequence being mutated while parsing.
public static int parseUnsignedInt |
(String s) |
throws |
public static Integer valueOf |
(String s, int radix) |
throws |
In other words, this method returns an Integer object equal to the value of:
new Integer(Integer.parseInt(s, radix))
public static Integer valueOf |
(String s) |
throws |
In other words, this method returns an Integer object equal to the value of:
new Integer(Integer.parseInt(s))
public static Integer valueOf |
(int i) |
public byte byteValue |
() |
public short shortValue |
() |
public int intValue |
() |
public long longValue |
() |
public float floatValue |
() |
public double doubleValue |
() |
public String toString |
() |
public int hashCode |
() |
public static int hashCode |
(int value) |
public boolean equals |
(Object obj) |
public static Integer getInteger |
(String nm) |
The first argument is treated as the name of a system property. System properties are accessible through the System.getProperty(java.lang.String) method. The string value of this property is then interpreted as an integer value using the grammar supported by decode and an Integer object representing this value is returned.
If there is no property with the specified name, if the specified name is empty or null, or if the property does not have the correct numeric format, then null is returned.
In other words, this method returns an Integer object equal to the value of:
getInteger(nm, null)
public static Integer getInteger |
(String nm, int val) |
The first argument is treated as the name of a system property. System properties are accessible through the System.getProperty(java.lang.String) method. The string value of this property is then interpreted as an integer value using the grammar supported by decode and an Integer object representing this value is returned.
The second argument is the default value. An Integer object that represents the value of the second argument is returned if there is no property of the specified name, if the property does not have the correct numeric format, or if the specified name is empty or null.
In other words, this method returns an Integer object equal to the value of:
getInteger(nm, new Integer(val))but in practice it may be implemented in a manner such as:
to avoid the unnecessary allocation of an Integer object when the default value is not needed.Integer result = getInteger(nm, null); return (result == null) ? new Integer(val) : result;
public static Integer getInteger |
The second argument is the default value. The default value is returned if there is no property of the specified name, if the property does not have the correct numeric format, or if the specified name is empty or null.
public static Integer decode |
(String nm) |
throws |
DecimalNumeral, HexDigits, and OctalDigits are as defined in section {@jls 3.10.1} of The Java Language Specification, except that underscores are not accepted between digits.
- DecodableString:
- Signopt DecimalNumeral
- Signopt 0x HexDigits
- Signopt 0X HexDigits
- Signopt # HexDigits
- Signopt 0 OctalDigits
- Sign:
- -
- +
The sequence of characters following an optional sign and/or radix specifier ("0x", "0X", "#", or leading zero) is parsed as by the Integer.parseInt method with the indicated radix (10, 16, or 8). This sequence of characters must represent a positive value or a 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.
public int compareTo |
(Integer anotherInteger) |
public static int compare |
(int x, int y) |
Integer.valueOf(x).compareTo(Integer.valueOf(y))
public static int compareUnsigned |
(int x, int y) |
public static long toUnsignedLong |
(int x) |
public static int divideUnsigned |
(int dividend, int divisor) |
Note that in two's complement arithmetic, the three other basic arithmetic operations of add, subtract, and multiply are bit-wise identical if the two operands are regarded as both being signed or both being unsigned. Therefore separate addUnsigned, etc. methods are not provided.
public static int remainderUnsigned |
(int dividend, int divisor) |
public static int highestOneBit |
(int i) |
public static int lowestOneBit |
(int i) |
public static int numberOfLeadingZeros |
(int i) |
Note that this method is closely related to the logarithm base 2. For all positive int values x:
public static int numberOfTrailingZeros |
(int i) |
public static int bitCount |
(int i) |
public static int rotateLeft |
(int i, int distance) |
Note that left rotation with a negative distance is equivalent to right rotation: rotateLeft(val, -distance) == rotateRight(val, distance). Note also that rotation by any multiple of 32 is a no-op, so all but the last five bits of the rotation distance can be ignored, even if the distance is negative: rotateLeft(val, distance) == rotateLeft(val, distance & 0x1F).
public static int rotateRight |
(int i, int distance) |
Note that right rotation with a negative distance is equivalent to left rotation: rotateRight(val, -distance) == rotateLeft(val, distance). Note also that rotation by any multiple of 32 is a no-op, so all but the last five bits of the rotation distance can be ignored, even if the distance is negative: rotateRight(val, distance) == rotateRight(val, distance & 0x1F).
public static int reverse |
(int i) |
public static int signum |
(int i) |
public static int reverseBytes |
(int i) |
public static int sum |
(int a, int b) |
public static int max |
(int a, int b) |
public static int min |
(int a, int b) |
() |
public Integer resolveConstantDesc |
(MethodHandles.Lookup lookup) |
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FlexDoc/Javadoc 2.0 Demo Java Doc |