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Java Source | 2000-05-25 | 4.0 KB | 127 lines |
- //: CADSystem.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.)
- /////////////////////////////////////////////////
-
- // Ensuring proper cleanup
- import java.util.*;
-
- class Shape {
- Shape(int i) {
- System.out.println("Shape constructor");
- }
- void cleanup() {
- System.out.println("Shape cleanup");
- }
- }
-
- class Circle extends Shape {
- Circle(int i) {
- super(i);
- System.out.println("Drawing a Circle");
- }
- void cleanup() {
- System.out.println("Erasing a Circle");
- super.cleanup();
- }
- }
-
- class Triangle extends Shape {
- Triangle(int i) {
- super(i);
- System.out.println("Drawing a Triangle");
- }
- void cleanup() {
- System.out.println("Erasing a Triangle");
- super.cleanup();
- }
- }
-
- class Line extends Shape {
- private int start, end;
- Line(int start, int end) {
- super(start);
- this.start = start;
- this.end = end;
- System.out.println("Drawing a Line: " +
- start + ", " + end);
- }
- void cleanup() {
- System.out.println("Erasing a Line: " +
- start + ", " + end);
- super.cleanup();
- }
- }
-
- public class CADSystem extends Shape {
- private Circle c;
- private Triangle t;
- private Line[] lines = new Line[10];
- CADSystem(int i) {
- super(i + 1);
- for(int j = 0; j < 10; j++)
- lines[j] = new Line(j, j*j);
- c = new Circle(1);
- t = new Triangle(1);
- System.out.println("Combined constructor");
- }
- void cleanup() {
- System.out.println("CADSystem.cleanup()");
- t.cleanup();
- c.cleanup();
- for(int i = 0; i < lines.length; i++)
- lines[i].cleanup();
- super.cleanup();
- }
- public static void main(String[] args) {
- CADSystem x = new CADSystem(47);
- try {
- // Code and exception handling...
- } finally {
- x.cleanup();
- }
- }
- } ///:~