Java.lang.Long Class

Java Long Class

The Long class in the Java.lang package encapsulates a value of the primitive type long in an object. A single field of type long is included in a Long object.

This class also has various methods for converting a long to a String and a String to a long, as well as additional constants and methods that are handy when working with longs.

Class declaration

The declaration of java.lang.Long class is:

 

public final class Long
  extends Number
    implements Comparable<Long>

Fields

 

S.N Fields & Description
1. static int BYTES
The number of bytes used to represent a long value in two’s complement binary form.
2. static long MAX_VALUE
A constant holding the maximum value a long can have, 263-1.
3. static long MIN_VALUE
A constant holding the minimum value a long can have, -263.
4. static int SIZE
The number of bits used to represent a long value in two’s complement binary form.
5. static Class<Long> TYPE
The Class instance representing the primitive type long.

java.lang.Long Methods

There are several methods in the java.lang.Long class, which are mentioned below:

 

Member Methods

 

S.N Methods & Description
1. static int bitCount(long i)
Returns the number of one-bits in the two’s complement binary representation of the specified long value.
2. byte byteValue()
Returns the value of this Long as a byte after a narrowing primitive conversion.
3. static int compare(long x, long y)
Compares two long values numerically.
4. int compareTo(Long anotherLong)
Compares two Long objects numerically.
5. static int compareUnsigned(long x, long y)
Compares two long values numerically treating the values as unsigned.
6. static Long decode(String nm)
Decodes a String into a Long.
7. static long divideUnsigned(long dividend, long 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.
8. double doubleValue()
Returns the value of this Long as a double after a widening primitive conversion.
9. boolean equals(Object obj)
Compares this object to the specified object.
10. float floatValue()
Returns the value of this Long as a float after a widening primitive conversion.
11. static Long getLong(String nm)
Determines the long value of the system property with the specified name.
12. static Long getLong(String nm, long val)
Determines the long value of the system property with the specified name.
13. static Long getLong(String nm, Long val)
Returns the long value of the system property with the specified name.
14. int hashCode()
Returns a hash code for this Long.
15. static int hashCode(long value)
Returns a hash code for a long value; compatible with Long.hashCode().
16. 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 in the specified long value.
17. int intValue()
Returns the value of this Long as an int after a narrowing primitive conversion.
18. long longValue()
Returns the value of this Long as a long value.
19. 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 in the specified long value.
20. static long max(long a, long b)
Returns the greater of two long values as if by calling Math.max.
21. static long min(long a, long b)
Returns the smaller of two long values as if by calling Math.min.
22. 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 of the specified long value.
23. 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 of the specified long value.
24. static long parseLong(String s)
Parses the string argument as a signed decimal long.
25. static long parseLong(String s, int radix)
Parses the string argument as a signed long in the radix specified by the second argument.
26. static long parseUnsignedLong(String s)
Parses the string argument as an unsigned decimal long.
27. static long parseUnsignedLong(String s, int radix)
Parses the string argument as an unsigned long in the radix specified by the second argument.
28. static long remainderUnsigned(long dividend, long 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.
29. static long reverse(long i)
Returns the value obtained by reversing the order of the bits in the two’s complement binary representation of the specified long value.
30. static long reverseBytes(long i)
Returns the value obtained by reversing the order of the bytes in the two’s complement representation of the specified long value.
31. static long rotateLeft(long i, int distance)
Returns the value obtained by rotating the two’s complement binary representation of the specified long value left by the specified number of bits.
32. static long rotateRight(long i, int distance)
Returns the value obtained by rotating the two’s complement binary representation of the specified long value right by the specified number of bits.
33. short shortValue()
Returns the value of this Long as a short after a narrowing primitive conversion.
34. static int signum(long i)
Returns the signum function of the specified long value.
35. static long sum(long a, long b)
Adds two long values together as per the + operator.
36. static String toBinaryString(long i)
Returns a string representation of the long argument as an unsigned integer in base 2.
37. static String toHexString(long i)
Returns a string representation of the long argument as an unsigned integer in base 16.
38. static String toOctalString(long i)
Returns a string representation of the long argument as an unsigned integer in base 8.
39. String toString()
Returns a String object representing this Long’s value.
40. static String toString(long i)
Returns a String object representing the specified long.
41. static String toString(long i, int radix)
Returns a string representation of the first argument in the radix specified by the second argument.
42. static String toUnsignedString(long i)
Returns a string representation of the argument as an unsigned decimal value.
43. static String toUnsignedString(long i, int radix)
Returns a string representation of the first argument as an unsigned integer value in the radix specified by the second argument.
44. static Long valueOf(long l)
Returns a Long instance representing the specified long value.
45. static Long valueOf(String s)
Returns a Long object holding the value of the specified String.
46. static Long valueOf(String s, int radix)
Returns a Long object holding the value extracted from the specified String when parsed with the radix given by the second argument.

Methods inherited

This class inherits the methods of the following class:

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

 

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Also Read: Java – While Loop

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