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Update App.java to have more information on the pattern #324

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Joseph McCarthy 2015-12-30 20:07:42 +00:00
parent dec5ff22fc
commit 623c2081cd
1 changed files with 9 additions and 4 deletions
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delegation/src/main/java/com/iluwatar/delegation/simple/App.java
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@ -5,11 +5,16 @@ import com.iluwatar.delegation.simple.printers.EpsonPrinter;
import com.iluwatar.delegation.simple.printers.HpPrinter; import com.iluwatar.delegation.simple.printers.HpPrinter;
/** /**
* The delegate pattern provides a mechanism to abstract away the implementation and control of the desired action.
* The class being called in this case {@link PrinterController} is not responsible for the actual desired action,
* but is actually delegated to a helper class either {@link CanonPrinter}, {@link EpsonPrinter} or {@link HpPrinter}.
* The consumer does not have or require knowledge of the actual class carrying out the action, only the
* container on which they are calling.
*
* In this example the delegates are {@link EpsonPrinter}, {@link HpPrinter} and {@link CanonPrinter} they all implement * In this example the delegates are {@link EpsonPrinter}, {@link HpPrinter} and {@link CanonPrinter} they all implement
* {@link Printer}. The {@link AbstractPrinterController} and through inheritance {@link PrinterController} also * {@link Printer}. The {@link PrinterController} class also implements {@link Printer}. However neither provide the
* implement {@link Printer}. However neither provide the functionality of {@link Printer} by printing to the screen, * functionality of {@link Printer} by printing to the screen, they actually call upon the instance of {@link Printer}
* they actually call upon the instance of {@link Printer} that they were instantiated with. Therefore delegating the * that they were instantiated with. Therefore delegating the behaviour to another class.
* behaviour to another class.
*/ */
public class App { public class App {