home *** CD-ROM | disk | FTP | other *** search
Java Source | 2000-05-25 | 3.3 KB | 84 lines |
- //: Detergent.java
- //////////////////////////////////////////////////
- // Copyright (c) Bruce Eckel, 1998
- // Source code file from the book "Thinking in Java"
- // All rights reserved EXCEPT as allowed by the
- // following statements: You can freely use this file
- // for your own work (personal or commercial),
- // including modifications and distribution in
- // executable form only. Permission is granted to use
- // this file in classroom situations, including its
- // use in presentation materials, as long as the book
- // "Thinking in Java" is cited as the source.
- // Except in classroom situations, you cannot copy
- // and distribute this code; instead, the sole
- // distribution point is http://www.BruceEckel.com
- // (and official mirror sites) where it is
- // freely available. You cannot remove this
- // copyright and notice. You cannot distribute
- // modified versions of the source code in this
- // package. You cannot use this file in printed
- // media without the express permission of the
- // author. Bruce Eckel makes no representation about
- // the suitability of this software for any purpose.
- // It is provided "as is" without express or implied
- // warranty of any kind, including any implied
- // warranty of merchantability, fitness for a
- // particular purpose or non-infringement. The entire
- // risk as to the quality and performance of the
- // software is with you. Bruce Eckel and the
- // publisher shall not be liable for any damages
- // suffered by you or any third party as a result of
- // using or distributing software. In no event will
- // Bruce Eckel or the publisher be liable for any
- // lost revenue, profit, or data, or for direct,
- // indirect, special, consequential, incidental, or
- // punitive damages, however caused and regardless of
- // the theory of liability, arising out of the use of
- // or inability to use software, even if Bruce Eckel
- // and the publisher have been advised of the
- // possibility of such damages. Should the software
- // prove defective, you assume the cost of all
- // necessary servicing, repair, or correction. If you
- // think you've found an error, please email all
- // modified files with clearly commented changes to:
- // Bruce@EckelObjects.com. (Please use the same
- // address for non-code errors found in the book.)
- /////////////////////////////////////////////////
-
- // Inheritance syntax & properties
-
- class Cleanser {
- private String s = new String("Cleanser");
- public void append(String a) { s += a; }
- public void dilute() { append(" dilute()"); }
- public void apply() { append(" apply()"); }
- public void scrub() { append(" scrub()"); }
- public void print() { System.out.println(s); }
- public static void main(String[] args) {
- Cleanser x = new Cleanser();
- x.dilute(); x.apply(); x.scrub();
- x.print();
- }
- }
-
- public class Detergent extends Cleanser {
- // Change a method:
- public void scrub() {
- append(" Detergent.scrub()");
- super.scrub(); // Call base-class version
- }
- // Add methods to the interface:
- public void foam() { append(" foam()"); }
- // Test the new class:
- public static void main(String[] args) {
- Detergent x = new Detergent();
- x.dilute();
- x.apply();
- x.scrub();
- x.foam();
- x.print();
- System.out.println("Testing base class:");
- Cleanser.main(args);
- }
- } ///:~