Tue, 14 May 2013 11:11:09 -0700
8012556: Implement lambda methods on interfaces as static
8006140: Javac NPE compiling Lambda expression on initialization expression of static field in interface
Summary: Lambdas occurring in static contexts or those not needing instance information should be generated into static methods. This has long been the case for classes. However, as a work-around to the lack of support for statics on interfaces, interface lambda methods have been generated into default methods. For lambdas in interface static contexts (fields and static methods) this causes an NPE in javac because there is no 'this'. MethodHandles now support static methods on interfaces. This changeset allows lambda methods to be generated as static interface methods. An existing bug in Hotspot (8013875) is exposed in a test when the "-esa" flag is used. This test and another test that already exposed this bug have been marked with @ignore.
Reviewed-by: mcimadamore
aoqi@0 | 1 | /* |
aoqi@0 | 2 | * @test /nodynamiccopyright/ |
aoqi@0 | 3 | * @bug 8003280 |
aoqi@0 | 4 | * @summary Add lambda tests |
aoqi@0 | 5 | * This test is for identifying a non-SAM type: Having overloaded methods due to inheritance |
aoqi@0 | 6 | * @compile/fail/ref=NonSAM3.out -XDrawDiagnostics NonSAM3.java Helper.java |
aoqi@0 | 7 | */ |
aoqi@0 | 8 | |
aoqi@0 | 9 | import java.util.Collection; |
aoqi@0 | 10 | import java.util.List; |
aoqi@0 | 11 | |
aoqi@0 | 12 | public class NonSAM3 { |
aoqi@0 | 13 | void method() { |
aoqi@0 | 14 | //all of the following will have compile error: "the target type of a lambda conversion has multiple non-overriding abstract methods" |
aoqi@0 | 15 | FooBar fb = (Number n) -> 100; |
aoqi@0 | 16 | FooBar fb2 = (Integer i) -> 100; |
aoqi@0 | 17 | DE de = (List<Integer> list) -> 100; |
aoqi@0 | 18 | DE de2 = (List<?> list) -> 100; |
aoqi@0 | 19 | DE de3 = (List list) -> 100; |
aoqi@0 | 20 | DE de4 = (Collection<Integer> collection) -> 100; |
aoqi@0 | 21 | DE de5 = (Collection<?> collection) -> 100; |
aoqi@0 | 22 | DE de6 = (Collection collection) -> 100; |
aoqi@0 | 23 | } |
aoqi@0 | 24 | } |