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Categories / Java Book / 003 Essential Classes

 

0167 Long class

The Long class wraps a value of long in an object. Long class provides several methods for converting a long to a String and a String to a long. Constants value from Long class static long MAX_VALUE Maximum value a long can have, 263-1. static long MIN_VALUE Minimum value a long can have, -263. static int SIZE The number of bits used to represent a long value in two's complement binary form. Constructors from Long Long(long value) Creates a Long object from long argument. Long(String s) Creates a Long object from the long value indicated by the String parameter. Convert long value to byte, double, float, int, long, short byte byteValue() Returns the value of this Long as a byte. double doubleValue() Returns the value of this Long as a double. float floatValue() Returns the value of this Long as a float. int intValue() Returns the value of this Long as an int. long longValue() Returns the value of this Long as a long value. short shortValue() Returns the value of this Long as a short. Decode a string to create long value static Long decode(String nm) Decodes a String into a Long. Get the long value from a string static Long getLong(String nm) Determines the long value of the system property with the specified name. static Long getLong(String nm, long val) Determines the long value of the system property with the specified name. static Long getLong(String nm, Long val) Returns the long value of the system property with the specified name. Compare two long values int compareTo(Long anotherLong) Compares two Long objects numerically. boolean equals(Object obj) Compares this object to the specified object. Parse long value from string static long parseLong(String s) Parses the string argument as a signed decimal long. static long parseLong(String s, int radix) Parses the string as a signed long in the radix. static Long valueOf(long l) Returns a Long instance representing the specified long value. static Long valueOf(String s) Returns a Long object holding the value of the specified String. static Long valueOf(String s, int radix) Returns a Long object holding the value extracted from the String with the radix. Convert long value to binary, hex and octal format strings static String toBinaryString(long i) Returns a string representation of the long argument as an unsigned integer in base 2. static String toHexString(long i) Returns a string representation of the long argument as an unsigned integer in base 16. static String toOctalString(long i) Returns a string representation of the long argument as an unsigned integer in base 8. Convert long value to string String toString() Returns a String object representing this Long's value. static String toString(long i) Returns a String object representing the specified long. static String toString(long i, int radix) Returns a string representation of the first argument in the radix. Get the sign of the long value static int signum(long i) Returns the signum function of the specified long value. Get the number of zero bits preceding and following static int numberOfLeadingZeros(long i) Returns the number of zero bits preceding the highest-order ("leftmost") one-bit in the two's complement binary representation. static int numberOfTrailingZeros(long i) Returns the number of zero bits following the lowest-order ("rightmost") one-bit in the two's complement binary representation. Reverse and rotate a long value static long reverse(long i) Returns the value obtained by reversing the order of the bits in the two's complement binary representation. static long reverseBytes(long i) Returns the value obtained by reversing the order of the bytes in the two's complement representation. static long rotateLeft(long i, int distance) Returns the value obtained by rotating the two's complement binary representation left by the number of bits. static long rotateRight(long i, int distance) Returns the value obtained by rotating the two's complement binary representation right by the number of bits. Bit oriented operation on long value static int bitCount(long i) Returns the number of one-bits in the two's complement binary representation of the specified long value. static long highestOneBit(long i) Returns a long value with at most a single one-bit, in the position of the highest-order ("leftmost") one-bit. static long lowestOneBit(long i) Returns a long value with at most a single one-bit, in the position of the lowest-order ("rightmost") one-bit.