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8206986: Compiler support for Switch Expressions (Preview)

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8207405: Compiler Tree API support for Switch Expressions (Preview)

Support for switch expression, switch with rules and multiple constants for cases.

Reviewed-by: jjg, mcimadamore, vromero
This commit is contained in:
Jan Lahoda 2018-08-29 09:36:17 +02:00
parent 3f4b55c4df
commit b3b644438e
121 changed files with 4753 additions and 268 deletions
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8
test/langtools/tools/javac/ConditionalWithVoid.java
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@ -4,13 +4,17 @@
* @summary The compiler was allowing void types in its parsing of conditional expressions.
* @author tball
*
* @compile/fail/ref=ConditionalWithVoid.out -XDrawDiagnostics ConditionalWithVoid.java
* @compile/fail/ref=ConditionalWithVoid.out --enable-preview -source 12 -XDrawDiagnostics ConditionalWithVoid.java
*/
public class ConditionalWithVoid {
public void test(Object o) {
public void test(Object o, String s) {
// Should fail to compile since Object.wait() has a void return type. Poly case.
System.out.println(o instanceof String ? o.hashCode() : o.wait());
// Should fail to compile since Object.wait() has a void return type. Standalone case.
(o instanceof String ? o.hashCode() : o.wait()).toString();
// Should fail to compile since Object.wait() has a void return type. Poly case.
System.out.println(switch (s) {case "" -> o.hashCode(); default -> o.wait();});
// Should fail to compile since Object.wait() has a void return type. Standalone case.
(switch (s) {case "" -> o.hashCode(); default -> o.wait();}).toString();
}
}