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92 lines
3.2 KiB
92 lines
3.2 KiB
7 months ago
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/*
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* Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* - Neither the name of Oracle nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* The sample illustrates the simplest use case of the <b>default methods</b>.
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*/
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public class SimplestUsage {
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/**
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* The Animal interface provides the default implementation
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* of the {@link #eat} method.
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*/
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public interface Animal {
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/**
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* Return string representation of the eat action for Animal
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*
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* @return string representation of the eat action for Animal
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*/
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default String eat() {
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return this.getClass().getSimpleName()
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+ " eats like an ordinary animal";
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}
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}
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/**
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* The Dog class doesn't have its own implementation of the {@link #eat}
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* method and uses the default implementation.
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*/
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public static class Dog implements Animal {
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}
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/**
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* The Mosquito class implements {@link #eat} method, its own implementation
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* overrides the default implementation.
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*
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*/
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public static class Mosquito implements Animal {
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/**
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* Return string representation of the eat action for Mosquito
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*
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* @return string representation of the eat action for Mosquito
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*/
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@Override
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public String eat() {
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return "Mosquito consumes blood";
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}
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}
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/**
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* Illustrate behavior of the classes: {@link Dog} and {@link Mosquito}
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*
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* @param args command-line arguments
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*/
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public static void main(String[] args) {
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// "Dog eats like an ordinary animal" is output
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System.out.println(new Dog().eat());
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// "Mosquito consumes blood" is output
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System.out.println(new Mosquito().eat());
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}
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}
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