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OnJava8-Examples/equalshashcode/SpringDetector.java at master · CSapprenticeWT/OnJava8-Examples · GitHub
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// equalshashcode/SpringDetector.java
// (c)2021 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
// What will the weather be?
import
java
.
util
.*;
import
java
.
util
.
stream
.*;
import
java
.
util
.
function
.*;
import
java
.
lang
.
reflect
.*;
public
class
SpringDetector
{
public
static
<
T
extends
Groundhog
>
void
detectSpring
(
Class
<
T
>
type
) {
try
{
Constructor
<
T
>
ghog
=
type
.
getConstructor
(
int
.
class
);
Map
<
Groundhog
,
Prediction
>
map
=
IntStream
.
range
(
0
,
10
)
.
mapToObj
(
i
-> {
try
{
return
ghog
.
newInstance
(
i
);
}
catch
(
Exception
e
) {
throw
new
RuntimeException
(
e
);
}
})
.
collect
(
Collectors
.
toMap
(
Function
.
identity
(),
gh
->
new
Prediction
()));
map
.
forEach
((
k
,
v
) ->
System
.
out
.
println
(
k
+
": "
+
v
));
Groundhog
gh
=
ghog
.
newInstance
(
3
);
System
.
out
.
println
(
"Looking up prediction for "
+
gh
);
if
(
map
.
containsKey
(
gh
))
System
.
out
.
println
(
map
.
get
(
gh
));
else
System
.
out
.
println
(
"Key not found: "
+
gh
);
}
catch
(
NoSuchMethodException
|
IllegalAccessException
|
InvocationTargetException
|
InstantiationException
e
) {
throw
new
RuntimeException
(
e
);
}
}
public
static
void
main
(
String
[]
args
) {
detectSpring
(
Groundhog
.
class
);
}
}
/* Output:
Groundhog #5: Six more weeks of Winter!
Groundhog #2: Early Spring!
Groundhog #1: Six more weeks of Winter!
Groundhog #0: Early Spring!
Groundhog #8: Early Spring!
Groundhog #6: Six more weeks of Winter!
Groundhog #4: Early Spring!
Groundhog #3: Early Spring!
Groundhog #7: Six more weeks of Winter!
Groundhog #9: Six more weeks of Winter!
Looking up prediction for Groundhog #3
Key not found: Groundhog #3
*/
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