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OnJava8-Examples/streams/OptionalFilter.java at master · xinan-w/OnJava8-Examples · GitHub
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// streams/OptionalFilter.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.
import
java
.
util
.*;
import
java
.
util
.
stream
.*;
import
java
.
util
.
function
.*;
class
OptionalFilter
{
static
String
[]
elements
= {
"Foo"
,
""
,
"Bar"
,
"Baz"
,
"Bingo"
};
static
Stream
<
String
>
testStream
() {
return
Arrays
.
stream
(
elements
);
}
static
void
test
(
String
descr
,
Predicate
<
String
>
pred
) {
System
.
out
.
println
(
" ---( "
+
descr
+
" )---"
);
for
(
int
i
=
0
;
i
<=
elements
.
length
;
i
++) {
System
.
out
.
println
(
testStream
()
.
skip
(
i
)
.
findFirst
()
.
filter
(
pred
));
}
}
public
static
void
main
(
String
[]
args
) {
test
(
"true"
,
str
->
true
);
test
(
"false"
,
str
->
false
);
test
(
"str !=
\"
\"
"
,
str
->
str
!=
""
);
test
(
"str.length() == 3"
,
str
->
str
.
length
() ==
3
);
test
(
"startsWith(
\"
B
\"
)"
,
str
->
str
.
startsWith
(
"B"
));
}
}
/* Output:
---( true )---
Optional[Foo]
Optional[]
Optional[Bar]
Optional[Baz]
Optional[Bingo]
Optional.empty
---( false )---
Optional.empty
Optional.empty
Optional.empty
Optional.empty
Optional.empty
Optional.empty
---( str != "" )---
Optional[Foo]
Optional.empty
Optional[Bar]
Optional[Baz]
Optional[Bingo]
Optional.empty
---( str.length() == 3 )---
Optional[Foo]
Optional.empty
Optional[Bar]
Optional[Baz]
Optional.empty
Optional.empty
---( startsWith("B") )---
Optional.empty
Optional.empty
Optional[Bar]
Optional[Baz]
Optional[Bingo]
Optional.empty
*/
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