Java example source code file (MethodReference44.java)

This example Java source code file (MethodReference44.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

foo, methodreference44, number, sam1, sam2, sam3, superfoo

The MethodReference44.java Java example source code

/*
 * @test /nodynamiccopyright/
 * @bug 8003280
 * @summary Add lambda tests
 *  check that generic method reference is inferred when type parameters are omitted
 * @compile/fail/ref=MethodReference44.out -XDrawDiagnostics MethodReference44.java
 */

public class MethodReference44 {

    static class SuperFoo<X> { }

    static class Foo<X extends Number> extends SuperFoo { }

    interface SAM1 {
        SuperFoo<String> m();
    }

    interface SAM2 {
        SuperFoo<Integer> m();
    }

    interface SAM3 {
        SuperFoo<Object> m();
    }

    static <X extends Number> Foo m() { return null; }

    static void g1(SAM1 s) { }

    static void g2(SAM2 s) { }

    static void g3(SAM3 s) { }

    static void g4(SAM1 s) { }
    static void g4(SAM2 s) { }
    static void g4(SAM3 s) { }

    public static void main(String[] args) {
        g1(MethodReference44::m);
        g2(MethodReference44::m);
        g3(MethodReference44::m);
        g4(MethodReference44::m);
    }
}