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test/tools/javac/lambda/VoidCompatibility.java@c09b7234cded (annotated)

test/tools/javac/lambda/VoidCompatibility.java

Tue, 14 May 2013 11:11:09 -0700

author

rfield

date

Tue, 14 May 2013 11:11:09 -0700

changeset 1752

c09b7234cded

parent 1510

7873d37f5b37

child 2525

2eb010b6cb22

permissions

-rw-r--r--

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

mcimadamore@1415	1	/*
mcimadamore@1415	2	* @test /nodynamiccopyright/
mcimadamore@1415	3	* @bug 8003280
mcimadamore@1415	4	* @summary Add lambda tests
mcimadamore@1415	5	* check that that void compatibility affects overloading as expected
mcimadamore@1510	6	* @compile VoidCompatibility.java
mcimadamore@1415	7	*/
mcimadamore@1415	8	class VoidCompatibility {
mcimadamore@1415	9
mcimadamore@1415	10	interface Runnable { void run(); } //1
mcimadamore@1415	11	interface Thunk<T> { T get(); } //2
mcimadamore@1415	12
mcimadamore@1415	13	void schedule(Runnable r) { }
mcimadamore@1415	14	void schedule(Thunk<?> t) { }
mcimadamore@1415	15
mcimadamore@1415	16	void test() {
mcimadamore@1510	17	schedule(() -> System.setProperty("done", "true")); //non-void most specific
mcimadamore@1415	18	schedule(() -> { System.setProperty("done", "true"); }); //1
mcimadamore@1415	19	schedule(() -> { return System.setProperty("done", "true"); }); //2
mcimadamore@1415	20	schedule(() -> System.out.println("done")); //1
mcimadamore@1415	21	schedule(() -> { System.out.println("done"); }); //1
mcimadamore@1415	22	schedule(Thread::yield); //1
mcimadamore@1510	23	schedule(Thread::getAllStackTraces); //non-void most specific
mcimadamore@1415	24	schedule(Thread::interrupted); //1 (most specific)
mcimadamore@1415	25	}
mcimadamore@1415	26	}