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The following commit(s) were added to refs/heads/main by this push:
new d282d5e153 doc: metion for the Java 21's new switch statement in
document
d282d5e153 is described below
commit d282d5e1538821eea129446b090d58ab9c63517a
Author: Luca Zhang <[email protected]>
AuthorDate: Tue Jan 23 00:44:36 2024 +0800
doc: metion for the Java 21's new switch statement in document
attach the code directly in the doc instead of putting it in
`ActorDocTest.java` because we don't support java-jdk-21 now
---
docs/src/main/paradox/actors.md | 35 +++++++++++++++++++++++++++++++++++
1 file changed, 35 insertions(+)
diff --git a/docs/src/main/paradox/actors.md b/docs/src/main/paradox/actors.md
index 60057b95f3..44e205bb8b 100644
--- a/docs/src/main/paradox/actors.md
+++ b/docs/src/main/paradox/actors.md
@@ -840,6 +840,41 @@ untyped version. When extending `UntypedAbstractActor`
each message is received
@@snip [ActorDocTest.java](/docs/src/test/java/jdocs/actor/ActorDocTest.java)
{ #optimized }
+In addition, Java 21 introduces [powerful pattern matching for
switch](https://openjdk.org/jeps/441) supporting any reference type. We can use
`switch` instead of `if ... else ...` for conditional branches:
+
+```java
+static class PatternMatchedActor extends UntypedAbstractActor {
+
+ public static class Msg1 {}
+
+ public static class Msg2 {}
+
+ public static class Msg3 {}
+
+ @Override
+ public void onReceive(Object msg) throws Exception {
+ switch(msg) {
+ case Msg1 msg -> receiveMsg1((Msg1) msg);
+ case Msg2 msg -> receiveMsg2((Msg2) msg);
+ case Msg3 msg -> receiveMsg3((Msg3) msg);
+ default _ -> unhandled(msg);
+ }
+ }
+
+ private void receiveMsg1(Msg1 msg) {
+ // actual work
+ }
+
+ private void receiveMsg2(Msg2 msg) {
+ // actual work
+ }
+
+ private void receiveMsg3(Msg3 msg) {
+ // actual work
+ }
+ }
+```
+
@@@
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