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Add tests for Java 21 unnamed patterns
TODO: Activate after eclipse-jdt/eclipse.jdt.core#893 is done. Signed-off-by: Alexander Kriegisch <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,85 @@ | ||
| import java.awt.*; | ||
| import java.util.List; | ||
| import java.util.PriorityQueue; | ||
| import java.util.Queue; | ||
| import java.util.stream.Collectors; | ||
| import java.util.stream.Stream; | ||
|
|
||
| /** | ||
| * Examples taken from <a href="https://openjdk.org/jeps/443">JEP 443</a> | ||
| */ | ||
| public class UnnamedPatternsPreview1 { | ||
| public static void main(String[] args) { | ||
| // An enhanced for loop with side effects | ||
| int acc = 0; | ||
| final int LIMIT = 2; | ||
| for (Order _ : List.of(new Order(), new Order(), new Order())) { | ||
| if (acc < LIMIT) | ||
| acc++; | ||
| } | ||
| System.out.println(acc); | ||
|
|
||
| // The initialisation of a basic for loop can declare unnamed local variables | ||
| for (int i = 0, _ = sideEffect(); i < 2; i++) { | ||
| System.out.println(i); | ||
| } | ||
|
|
||
| // An assignment statement, where the result of the expression on the right hand side is not needed | ||
| Queue<Integer> q = new PriorityQueue<>(List.of(1, 2, 3, 4, 5, 6)); | ||
| while (q.size() >= 3) { | ||
| var x = q.remove(); | ||
| var y = q.remove(); | ||
| var _ = q.remove(); | ||
| System.out.println(new Point(x, y)); | ||
| } | ||
|
|
||
| // The same unnamed variable name '_' can be used in multiple assignment statements | ||
| q = new PriorityQueue<>(List.of(1, 2, 3, 4, 5, 6)); | ||
| while (q.size() >= 3) { | ||
| var x = q.remove(); | ||
| var _ = q.remove(); | ||
| var _ = q.remove(); | ||
| System.out.println(new Point(x, 0)); | ||
| } | ||
|
|
||
| // Unnamed variables can be used in one or multiple catch blocks | ||
| String s = "123xy"; | ||
| try { | ||
| int i = Integer.parseInt(s); | ||
| System.out.println(i); | ||
| } catch (NumberFormatException _) { | ||
| System.out.println("Bad number: " + s); | ||
| } catch (Exception _) { | ||
| System.out.println("Unexpected error"); | ||
| } | ||
|
|
||
| // Try with resources | ||
| try (var _ = ScopedContext.acquire()) { | ||
| System.out.println("Doing something within scoped context"); | ||
| } | ||
|
|
||
| // A lambda whose parameter is irrelevant | ||
| System.out.println( | ||
| Stream.of("one", "two", "three") | ||
| .collect(Collectors.toMap(String::toUpperCase, _ -> "NODATA")) | ||
| ); | ||
| } | ||
|
|
||
| static int sideEffect() { | ||
| System.out.println("side effect"); | ||
| return 42; | ||
| } | ||
|
|
||
| static class Order {} | ||
|
|
||
| static class ScopedContext implements AutoCloseable { | ||
| public static ScopedContext acquire() { | ||
| return new ScopedContext(); | ||
| } | ||
|
|
||
| @Override | ||
| public void close() { | ||
| System.out.println("Closing scoped context"); | ||
| } | ||
| } | ||
| } |
89 changes: 89 additions & 0 deletions
89
tests/features1921/java21/UnnamedPatternsPreview1Aspect.aj
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,89 @@ | ||
| import java.awt.*; | ||
| import java.util.List; | ||
| import java.util.PriorityQueue; | ||
| import java.util.Queue; | ||
| import java.util.stream.Collectors; | ||
| import java.util.stream.Stream; | ||
|
|
||
| /** | ||
| * Examples taken from <a href="https://openjdk.org/jeps/443">JEP 443</a> | ||
| */ | ||
| public class UnnamedPatternsPreview1Aspect { | ||
| public static void main(String[] args) {} | ||
|
|
||
| before() : execution(* main(String[])) { | ||
| System.out.println(thisJoinPoint); | ||
|
|
||
| // An enhanced for loop with side effects | ||
| int acc = 0; | ||
| final int LIMIT = 2; | ||
| for (Order _ : List.of(new Order(), new Order(), new Order())) { | ||
| if (acc < LIMIT) | ||
| acc++; | ||
| } | ||
| System.out.println(acc); | ||
|
|
||
| // The initialisation of a basic for loop can declare unnamed local variables | ||
| for (int i = 0, _ = sideEffect(); i < 2; i++) { | ||
| System.out.println(i); | ||
| } | ||
|
|
||
| // An assignment statement, where the result of the expression on the right hand side is not needed | ||
| Queue<Integer> q = new PriorityQueue<>(List.of(1, 2, 3, 4, 5, 6)); | ||
| while (q.size() >= 3) { | ||
| var x = q.remove(); | ||
| var y = q.remove(); | ||
| var _ = q.remove(); | ||
| System.out.println(new Point(x, y)); | ||
| } | ||
|
|
||
| // The same unnamed variable name '_' can be used in multiple assignment statements | ||
| q = new PriorityQueue<>(List.of(1, 2, 3, 4, 5, 6)); | ||
| while (q.size() >= 3) { | ||
| var x = q.remove(); | ||
| var _ = q.remove(); | ||
| var _ = q.remove(); | ||
| System.out.println(new Point(x, 0)); | ||
| } | ||
|
|
||
| // Unnamed variables can be used in one or multiple catch blocks | ||
| String s = "123xy"; | ||
| try { | ||
| int i = Integer.parseInt(s); | ||
| System.out.println(i); | ||
| } catch (NumberFormatException _) { | ||
| System.out.println("Bad number: " + s); | ||
| } catch (Exception _) { | ||
| System.out.println("Unexpected error"); | ||
| } | ||
|
|
||
| // Try with resources | ||
| try (var _ = ScopedContext.acquire()) { | ||
| System.out.println("Doing something within scoped context"); | ||
| } | ||
|
|
||
| // A lambda whose parameter is irrelevant | ||
| System.out.println( | ||
| Stream.of("one", "two", "three") | ||
| .collect(Collectors.toMap(String::toUpperCase, _ -> "NODATA")) | ||
| ); | ||
| } | ||
|
|
||
| static int sideEffect() { | ||
| System.out.println("side effect"); | ||
| return 42; | ||
| } | ||
|
|
||
| static class Order {} | ||
|
|
||
| static class ScopedContext implements AutoCloseable { | ||
| public static ScopedContext acquire() { | ||
| return new ScopedContext(); | ||
| } | ||
|
|
||
| @Override | ||
| public void close() { | ||
| System.out.println("Closing scoped context"); | ||
| } | ||
| } | ||
| } |
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