20.11

java.lang.Math

THE PACKAGE JAVA.LANG

Special cases:

If the argument is NaN, the result is

0

.

If the argument is negative infinity, or indeed any value less than or equal to

the value of

Long.MIN_VALUE

 ( 20.7.1), the result is equal to the value of

Long.MIN_VALUE

.

If the argument is positive infinity, or indeed any value greater than or equal to

the value of

Long.MAX_VALUE

 ( 20.7.2), the result is equal to the value of

Long.MAX_VALUE

.

20.11.20

public static double random()

The result is a double value with positive sign, greater than or equal to zero but

less than

1.0

, chosen pseudorandomly with (approximately) uniform distribution

from that range.

When this method is first called, it creates a single new pseudorandom num 

ber generator, exactly as if by the expression

new java.util.Random()

This new pseudorandom number generator is used thereafter for all calls to

this method and is used nowhere else.

This method is properly synchronized to allow correct use by more than one

thread. However, if many threads need to generate pseudorandom numbers at a

great rate, it may reduce contention for each thread to have its own pseudorandom

number generator.

20.11.21

public static int abs(int a)

The result is the absolute value of the argument, if possible.

If the argument is not negative, the argument is returned.

If the argument is negative, the negation of the argument is returned. Note that

if the argument is equal to the value of

Integer.MIN_VALUE

 ( 20.7.1), the most

negative representable

int

 value, the result will be that same negative value.

20.11.22

public static long abs(long a)

The result is the absolute value of the argument, if possible.

If the argument is not negative, the argument is returned.

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