52 lines
1.5 KiB
Java
52 lines
1.5 KiB
Java
// generics/decorator/Decoration.java
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// (c)2016 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://mindviewinc.com/Books/OnJava/ for more book information.
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// {main: generics.decorator.Decoration}
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package generics.decorator;
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import java.util.*;
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class Basic {
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private String value;
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public void set(String val) { value = val; }
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public String get() { return value; }
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}
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class Decorator extends Basic {
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protected Basic basic;
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public Decorator(Basic basic) { this.basic = basic; }
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@Override
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public void set(String val) { basic.set(val); }
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@Override
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public String get() { return basic.get(); }
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}
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class TimeStamped extends Decorator {
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private final long timeStamp;
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public TimeStamped(Basic basic) {
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super(basic);
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timeStamp = new Date().getTime();
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}
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public long getStamp() { return timeStamp; }
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}
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class SerialNumbered extends Decorator {
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private static long counter = 1;
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private final long serialNumber = counter++;
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public SerialNumbered(Basic basic) { super(basic); }
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public long getSerialNumber() { return serialNumber; }
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}
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public class Decoration {
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public static void main(String[] args) {
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TimeStamped t = new TimeStamped(new Basic());
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TimeStamped t2 = new TimeStamped(
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new SerialNumbered(new Basic()));
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//- t2.getSerialNumber(); // Not available
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SerialNumbered s = new SerialNumbered(new Basic());
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SerialNumbered s2 = new SerialNumbered(
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new TimeStamped(new Basic()));
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//- s2.getStamp(); // Not available
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}
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}
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