| /* |
| * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * 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. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * @test |
| * @bug 8186961 |
| * @run main/othervm StaticFieldsOnInterface C |
| * @run main/othervm StaticFieldsOnInterface D |
| * @run main/othervm StaticFieldsOnInterface Y |
| */ |
| |
| public class StaticFieldsOnInterface { |
| /* |
| A |
| / \ |
| B C |
| \ / |
| D |
| |
| Interface A has a public field |
| Ensure B, C, D only report exactly one public field |
| |
| A |
| / |
| X A |
| |/ |
| Y |
| |
| Ensure class Y, extending class X, reports exactly one public field |
| */ |
| |
| public interface A { |
| public static final int CONSTANT = 42; |
| } |
| |
| public interface B extends A { |
| } |
| |
| public interface C extends A { |
| } |
| |
| public interface D extends B, C { |
| } |
| |
| static class X implements A {} |
| static class Y extends X implements A {} |
| |
| public static void main(String[] args) throws Exception { |
| char first = 'C'; |
| if (args.length > 0) { |
| first = args[0].charAt(0); |
| } |
| |
| assertOneField(A.class); |
| // D first |
| if (first == 'D') { |
| assertOneField(D.class); |
| assertOneField(C.class); |
| } |
| // C first |
| else if (first == 'C') { |
| assertOneField(C.class); |
| assertOneField(D.class); |
| } |
| else { |
| assertOneField(Y.class); |
| } |
| } |
| |
| static void assertOneField(Class<?> c) { |
| int nfs = c.getFields().length; |
| if (nfs != 1) { |
| throw new AssertionError(String.format( |
| "Class %s does not have exactly one field: %d", c.getName(), nfs)); |
| } |
| } |
| } |