1 /*
2  * Copyright (C) 2016 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 import java.lang.reflect.Method;
18 
19 public class IsDefaultTest {
20   interface DefaultInterface {
sayHi()21     default void sayHi() {
22       System.out.println("hi default");
23     }
24   }
25 
26   interface RegularInterface {
sayHi()27     void sayHi();
28   }
29 
30   class ImplementsWithDefault implements DefaultInterface {}
31   class ImplementsWithRegular implements RegularInterface {
sayHi()32     public void sayHi() {
33       System.out.println("hello specific");
34     }
35   }
36 
printIsDefault(Class<?> klass)37   private static void printIsDefault(Class<?> klass) {
38     Method m;
39     try {
40       m = klass.getMethod("sayHi");
41     } catch (Throwable t) {
42       System.out.println(t);
43       return;
44     }
45 
46     boolean isDefault = m.isDefault();
47     System.out.println(klass.getName() + " is default = " + (isDefault ? "yes" : "no"));
48   }
49 
test()50   public static void test() {
51     System.out.println("==============================");
52     System.out.println("Are These Methods Default:");
53     System.out.println("==============================");
54 
55     printIsDefault(DefaultInterface.class);
56     printIsDefault(RegularInterface.class);
57     printIsDefault(ImplementsWithDefault.class);
58     printIsDefault(ImplementsWithRegular.class);
59   }
60 }
61