43 lines
967 B
Java
43 lines
967 B
Java
// patterns/CleanTheFloor.java
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// (c)2021 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://OnJava8.com for more book information.
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// State with different compositional interface.
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class FloorCleaner {
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private Attachment attachment = new Vacuum();
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public void change(Attachment newAttachment) {
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attachment = newAttachment;
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}
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public void clean() { attachment.action(); }
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}
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interface Attachment {
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void action();
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}
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class Vacuum implements Attachment {
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@Override public void action() {
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System.out.println("Vacuuming");
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}
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}
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class Mop implements Attachment {
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@Override public void action() {
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System.out.println("Mopping");
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}
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}
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public class CleanTheFloor {
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public static void main(String[] args) {
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FloorCleaner floorCleaner = new FloorCleaner();
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floorCleaner.clean();
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floorCleaner.change(new Mop());
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floorCleaner.clean();
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}
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}
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/* Output:
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Vacuuming
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Mopping
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*/
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