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OnJava8-Examples/functional/Strategize.java at master · CSapprenticeWT/OnJava8-Examples · GitHub
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Strategize.java
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Strategize.java
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// functional/Strategize.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.
interface
Strategy
{
String
approach
(
String
msg
);
}
class
Soft
implements
Strategy
{
@
Override
public
String
approach
(
String
msg
) {
return
msg
.
toLowerCase
() +
"?"
;
}
}
class
Unrelated
{
static
String
twice
(
String
msg
) {
return
msg
+
" "
+
msg
;
}
}
public
class
Strategize
{
Strategy
strategy
;
String
msg
;
Strategize
(
String
msg
) {
strategy
=
new
Soft
();
// [1]
this
.
msg
=
msg
;
}
void
communicate
() {
System
.
out
.
println
(
strategy
.
approach
(
msg
));
}
void
changeStrategy
(
Strategy
strategy
) {
this
.
strategy
=
strategy
;
}
public
static
void
main
(
String
[]
args
) {
Strategy
[]
strategies
= {
new
Strategy
() {
// [2]
public
String
approach
(
String
msg
) {
return
msg
.
toUpperCase
() +
"!"
;
}
},
msg
->
msg
.
substring
(
0
,
5
),
// [3]
Unrelated
::
twice
// [4]
};
Strategize
s
=
new
Strategize
(
"Hello there"
);
s
.
communicate
();
for
(
Strategy
newStrategy
:
strategies
) {
s
.
changeStrategy
(
newStrategy
);
// [5]
s
.
communicate
();
// [6]
}
}
}
/* Output:
hello there?
HELLO THERE!
Hello
Hello there Hello there
*/
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