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// VIM_TEST_SETUP let g:java_highlight_functions = 'style'
import java.lang.annotation.ElementType;
import java.util.function.BinaryOperator;
import java.util.function.Function;
import java.util.function.Predicate;
class LambdaExpressionsTests // JDK 21+.
{
<I1, C1, C2, T1, T2, T3, Z1, Z2, Z3, S1, S2, S3> void test()
{ // Schönfinkel's functions.
I<I1> i = x -> x;
C<C1, C2> c = x -> y -> x;
T<T1, T2, T3> t = f -> y -> x -> f.apply(x).apply(y);
Z<Z1, Z2, Z3> z = f -> g -> x -> f.apply(g.apply(x));
S<S1, S2, S3> s = f -> g -> x -> f.apply(x)
.apply(g.apply(x));
I<I1> i01 = (var x) -> x;
I<I1> i02 = (@Taggable var x) -> x;
I<I1> i03 = (@Taggable @Taggable var x) -> x;
I<I1> i04 = (final var x) -> x;
I<I1> i05 = (@Taggable final var x) -> x;
I<I1> i06 = (@Taggable @Taggable final var x) -> x;
I<I1> i07 = (I1 x) -> x;
I<I1> i08 = (@Taggable I1 x) -> x;
I<I1> i09 = (@Taggable @Taggable I1 x) -> x;
I<I1> i10 = (final I1 x) -> x;
I<I1> i11 = (@Taggable final I1 x) -> x;
I<I1> i12 = (@Taggable @Taggable final I1 x) -> x;
I<I1[]> ii01 = (I1... x) -> x;
I<I1[]> ii02 = (@Taggable I1... x) -> x;
I<I1[]> ii03 = (@Taggable @Taggable I1... x) -> x;
I<I1[]> ii04 = (final I1... x) -> x;
I<I1[]> ii05 = (@Taggable final I1... x) -> x;
I<I1[]> ii06 = (@Taggable @Taggable final I1... x) -> x;
BinaryOperator<I1> leftConst01 = (var x, var y) -> x;
BinaryOperator<I1> leftConst02 = (@Taggable var x,
@Taggable var y) -> x;
BinaryOperator<I1> leftConst03 = (@Taggable @Taggable var
x, @Taggable @Taggable var y) -> x;
BinaryOperator<I1> leftConst04 = (final var x,
final var y) -> x;
BinaryOperator<I1> leftConst05 = (@Taggable final
var x, @Taggable final var y) -> x;
BinaryOperator<I1> leftConst06 = (@Taggable
@Taggable final var x,
@Taggable
@Taggable final var y) -> x;
BinaryOperator<I1> leftConst07 = (I1 x, I1 y) -> x;
BinaryOperator<I1> leftConst08 = (@Taggable I1 x,
@Taggable I1 y) -> x;
BinaryOperator<I1> leftConst09 = (@Taggable @Taggable I1
x, @Taggable @Taggable I1 y) -> x;
BinaryOperator<I1> leftConst10 = (final I1 x,
final I1 y) -> x;
BinaryOperator<I1> leftConst11 = (@Taggable final
I1 x, @Taggable final I1 y) -> x;
BinaryOperator<I1> leftConst12 = (@Taggable
@Taggable final I1 x,
@Taggable
@Taggable final I1 y) -> x;
Runnable noOp = () -> {};
BinaryOperator<I1> leftConst = (x, y) -> x;
I<I1> id1 = (x) -> (x);
@SuppressWarnings("unchecked") I<I1> id2 =
((I<I<I1>>) (I<?>) (Function<I1,
I1> x) -> x).apply(switch (0) {
case ((int) (byte) 1) -> (I1 x) -> x;
default -> (@Taggable I1 x) -> x; });
C<C1, C2> const1 = (x) -> (y) -> (x);
C<C1, C2> const2 = switch(switch ("") {
case "->"->"(s)->(s)";
default->"default"; }) {
case ("->")->(var x)->(var y)->(x);
default->(@Taggable var x)->(@Taggable var y)
->(x);
};
}
@java.lang.annotation.Target(ElementType.PARAMETER)
@java.lang.annotation.Repeatable(Taggables.class)
@interface Taggable { String[] value() default ""; }
@java.lang.annotation.Target(ElementType.PARAMETER)
@interface Taggables { Taggable[] value(); }
interface I<A1> extends Function<A1, A1> { }
interface C<A1, A2> extends Function<A1, Function<A2, A1>> { }
interface T<A1, A2, A3> extends
Function<Function<A1, Function<A2, A3>>,
Function<A2,
Function<A1, A3>>> { }
interface Z<A1, A2, A3> extends Function<Function<A2, A3>,
Function<Function<A1, A2>,
Function<A1, A3>>> { }
interface S<A1, A2, A3> extends
Function<Function<A1, Function<A2, A3>>,
Function<Function<A1, A2>,
Function<A1, A3>>> { }
static void echo(Object o) { System.out.println(o); }
static {
enum Letters { OTHER, ALPHA, BETA }
Letters other = Letters.OTHER;
switch (other) {
case Letters alpha when Letters.ALPHA == alpha:
{ echo(alpha); break; }
case Letters beta when Letters.BETA == beta:
{ echo(beta); break; }
default: { echo(other); }
}
echo(switch (other) {
case Letters alpha when Letters.ALPHA == alpha
-> alpha;
case Letters beta when Letters.BETA == beta
-> beta;
default -> other;
});
switch (null) {
case String str when !"<empty>".equals(switch (str) {
case String str_ when
Predicate.<String>not(text ->
!text.isEmpty())
.test(str_)
-> "<empty>";
case String str_ -> str_;
}): { echo(str); break; }
case null: default: { echo("Other"); }
};
echo(switch (null) {
case String str when !"<empty>".equals(
switch (str) {
case String str_ when
Predicate.<String>not(text ->
!text.isEmpty())
.test(str_)
-> "<empty>";
case String str_ -> str_;
}) -> str;
case null, default -> "Other";
});
}
}
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