public final class MathUtil extends Object
Modifier and Type | Method and Description |
---|---|
static int |
compare(int x,
int y)
Compares two
int values. |
static int |
compare(long x,
long y)
Compare two
long values. |
static int |
findNextPositivePowerOfTwo(int value)
Fast method of finding the next power of 2 greater than or equal to the supplied value.
|
static boolean |
isOutOfBounds(int index,
int length,
int capacity)
Determine if the requested
index and length will fit within capacity . |
static int |
safeFindNextPositivePowerOfTwo(int value)
Fast method of finding the next power of 2 greater than or equal to the supplied value.
|
public static int findNextPositivePowerOfTwo(int value)
If the value is <= 0
then 1 will be returned.
This method is not suitable for Integer.MIN_VALUE
or numbers greater than 2^30.
value
- from which to search for next power of 2public static int safeFindNextPositivePowerOfTwo(int value)
This method will do runtime bounds checking and call findNextPositivePowerOfTwo(int)
if within a
valid range.
value
- from which to search for next power of 2Special cases for return values are as follows:
<= 0
-> 1>= 2^30
-> 2^30public static boolean isOutOfBounds(int index, int length, int capacity)
index
and length
will fit within capacity
.index
- The starting index.length
- The length which will be utilized (starting from index
).capacity
- The capacity that index + length
is allowed to be within.true
if the requested index
and length
will fit within capacity
.
false
if this would result in an index out of bounds exception.public static int compare(int x, int y)
int
values.x
- the first int
to comparey
- the second int
to compare0
if x == y
;
-1
if x < y
; and
1
if x > y
public static int compare(long x, long y)
long
values.x
- the first long
to compare.y
- the second long
to compare.x == y
> 0
if x > y
< 0
if x < y
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