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Java/Sorts/SortUtils.java at master · tmollard/Java · GitHub
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package
Sorts
;
import
java
.
util
.
Arrays
;
import
java
.
util
.
List
;
/**
* The class contains util methods
*
* @author Podshivalov Nikita (https://github.com/nikitap492)
**/
final
class
SortUtils
{
/**
* Helper method for swapping places in array
*
* @param array The array which elements we want to swap
* @param idx index of the first element
* @param idy index of the second element
*/
static
<
T
>
boolean
swap
(
T
[]
array
,
int
idx
,
int
idy
) {
T
swap
=
array
[
idx
];
array
[
idx
] =
array
[
idy
];
array
[
idy
] =
swap
;
return
true
;
}
/**
* This method checks if first element is less than the other element
*
* @param v first element
* @param w second element
* @return true if the first element is less than the second element
*/
static
<
T
extends
Comparable
<
T
>>
boolean
less
(
T
v
,
T
w
) {
return
v
.
compareTo
(
w
) <
0
;
}
/**
* This method checks if first element is greater than the other element
*
* @param v first element
* @param w second element
* @return true if the first element is greater than the second element
*/
static
<
T
extends
Comparable
<
T
>>
boolean
greater
(
T
v
,
T
w
) {
return
v
.
compareTo
(
w
) >
0
;
}
/**
* Prints a list
*
* @param toPrint - a list which should be printed
*/
static
void
print
(
List
<?>
toPrint
) {
toPrint
.
stream
()
.
map
(
Object
::
toString
)
.
map
(
str
->
str
+
" "
)
.
forEach
(
System
.
out
::
print
);
System
.
out
.
println
();
}
/**
* Prints an array
*
* @param toPrint - an array which should be printed
*/
static
void
print
(
Object
[]
toPrint
) {
System
.
out
.
println
(
Arrays
.
toString
(
toPrint
));
}
/**
* Swaps all position from {@param left} to @{@param right} for {@param array}
*
* @param array is an array
* @param left is a left flip border of the array
* @param right is a right flip border of the array
*/
static
<
T
extends
Comparable
<
T
>>
void
flip
(
T
[]
array
,
int
left
,
int
right
) {
while
(
left
<=
right
) {
swap
(
array
,
left
++,
right
--);
}
}
}
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