Create Abstract Class - Java Object Oriented Design

Java examples for Object Oriented Design:Abstract Class

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Description

Create Abstract Class

Demo Code

import java.util.*;

public class AbstractClassTest {
    public static void main(String[] args) {

        //check out the class alien one
        AlienCreatureOne aOne = new AlienCreatureOne();
        System.out.format("%s%n", aOne.lifeBegins());
        System.out.format("%s%n", aOne.live());
        System.out.format("%s%n", aOne.lifeEnds());

        //check out the class alien two
        AlienCreatureTwo aTwo = new AlienCreatureTwo();
        System.out.format("%s%n", aTwo.lifeBegins());
        System.out.format("%s%n", aTwo.live());
        System.out.format("%s%n", aTwo.lifeEnds());
    }/*from w  ww  . j  a  va 2  s.c om*/

}
abstract class AlienCreature {
    // all creaturesd are born
    String lifeBegins() {
        String me = "Hello, I'm here.";
        return me;
    }

    // creatures live by eating different material..so this is abstract
    abstract String live();

    // all creatures die
    String lifeEnds() {
        String meEnd = "Oh no, it all ends - bye. ";
        return meEnd;
    }
}

//nonabstract subclass 1
class AlienCreatureOne extends AlienCreature {
    String live() {
        String living = "We alien ones live happily on alien one nutrition.";
        return living;
    }
}
//nonabstract subclass 2

class AlienCreatureTwo extends AlienCreature {
    String live() {
        String living = "We alien twos live happily on alien two nutrition.";
        return living;
    }
}
/*
 * Copyright (c) 1995, 2008, Oracle and/or its affiliates. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Oracle or the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

Result


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