1 /* 2 * Copyright (C) 2020 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 interface Itf { fib(int a)18 public default int fib(int a) { 19 if (a <= 1) return a; 20 return fib(a - 1) + fib(a - 2); 21 } 22 } 23 24 public class Main implements Itf { 25 main(String[] args)26 public static void main(String[] args) { 27 int result = new Main().fib(2); 28 if (result != 1) { 29 throw new Error("Expected 1, got " + result); 30 } 31 } 32 fib(int a)33 public int fib(int a) { 34 return Itf.super.fib(a); 35 } 36 } 37