test/langtools/tools/javac/lambda/methodReference/MethodRef3.java

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 * 2 along with this work; if not, write to the Free Software Foundation,
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/**
 * @test
 * @bug 8003280
 * @summary Add lambda tests
 *   Test unbound method reference
 * @compile MethodRef3.java
 * @run main MethodRef3
 */

public class MethodRef3 {

    static interface A { String m(MethodRef3 mr); }

    static interface B { String m(MethodRef3 mr, String s); }

    private static void assertTrue(boolean cond) {
        if (!cond)
            throw new AssertionError();
    }

    String moo() {
        return "moo";
    }

    String wahoo(String s) {
        return "wahoo " + s;
    }

    public static void main(String[] args) {

        MethodRef3 mr = new MethodRef3();
        A a = MethodRef3::moo; //unbound reference to moo()
        assertTrue( a.m(mr).equals("moo") );
        B b = MethodRef3::wahoo; //unbound reference to wahoo()
        assertTrue( b.m(mr, "hi").equals("wahoo hi") );
    }
}