test/langtools/tools/javac/defaultMethods/private/PrivateGenerics.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
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 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
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 */

/*
 * @test
 * @bug    8071453
 * @summary Verify that generics work with private method in interface
 */

public class PrivateGenerics {

    interface I<T> {
        private T foo() { return null; };
        default void m(T t) {
            T t1 = t;
            T t2 = foo();
        }
    }

    interface J {
        private <M> M foo() { return null; }
        default <N> void m(N n) {
            N n1 = n;
            N n2 = foo();
        }
    }

    public static void main(String[] args) {
        I<String> i = new I<>() {};
        i.m("string");
        String s = i.foo();

        J j = new J() {};
        j.m("string");
        s = j.foo();
    }
}