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The hardest of our three exercises is behind us! Most people never do switch views this way. They do it the no-brainer way. Boy, is this next example going to be easy for you! So come on let s go for the no-brainer Switch View app. Check out how easy it is compared to what you ve just done.

The Observer pattern s intent is to define a one-to-many dependency so that when one object changes state, all its dependents are notified and updated automatically. Java provides support for implementing the Observer pattern via the java.util. Observer interface and the java.util.Observable class. The Observer pattern is also known as Dependents or Publish-Subscribe. The UML is shown in Figure 5-19.

At this point, we need to identify the conserved currents associated with the action in Eq. (7.2). Before tackling supersymmetry, let s review how to calculate a conserved current by looking at momentum. You can practice in the Quiz by looking at Lorentz transformations. Let s start with a simple example to remind ourselves of the method. EXAMPLE 7.3 2 Consider the action S = T /2 d ( X X i ) and nd the conserved current associated with translational invariance.

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Benefits Following is a list of benefits of using the Observer pattern:

T L = ( X X i ) 2 To examine translational invariance, we let X X + a where a is an in nitesimal parameter. A key insight into the fact that a is in nitesimal is that we can drop terms that are second order in a . Taking X X + a changes the lagrangian as follows: L = T ( X + a ) ( X + a ) i 2

As always, let us start off with a clean desktop. All you should have on your desktop are the einstein01.png and einstein02.png images from the 006__6hEinSwitch01.zip you downloaded for the previous example. Delete, or just file away in your Resources folder, the 57 57 pixel icon and the Lazy Load text file. Save the two images on your desktop so that it is organized like mine, as shown Figure 6 55.

n It abstracts the coupling between the subject and the observer. n It provides support for broadcast-type communication.

T ( X + a )( X + a ) + LF 2 T = X X + X a + a X + a a + LF 2 T = X X + X a + a X + LF 2 (drop second-order term a a ) =L T X a + a X 2 (add in X X to LF to get total lagrangian) d

Applicable Scenarios The following scenarios are most appropriate for the Observer pattern:

FIGURE 5-19

Note that the term i LF is unaffected by X X + a . Now, we focus on the leftover extra term:

Figure 6 55. A clean desktop at the start of the einSwitch002 example. We see only three icons: Mac HD and two image files.

Java EE Technology Feature and Java SE API Association The Java EE technology feature associated with the Observer pattern is the JMS (Java Message Server) Publish/Subscribe Model. The Java SE APIs associated with the Observer pattern are

L =

Example Code The following example Java code demonstrates the Observer pattern:

We will manipulate this expression to get our conserved current, which will be a term multiplying a . We can x up this expression doing some index gymnastics, which is a good exercise for us to go through given the level of this book. For more practice doing this, consult Relativity Demysti ed. We want to x up the second term so that it looks like the rst term. We do this by raising and lowering indices with the metric and using the fact that

Open Xcode and enter N as shown in Figure 6 56. This will open the New Project window in which you will click on the Tab Bar Application template. Name this project einSwitch002, as shown in Figure 6 57.

package javaee.architect.Observer; public class ObserverPattern { public static void main(String[] args) { System.out.println("Observer Pattern Demonstration."); System.out.println("-------------------------------"); // Constructing observers. System.out.println("Constructing observer1 and observer2."); ObserverIF observer1 = new ConcreteObserver(); ObserverIF observer2 = new ConcreteObserver(); // Constructing observable (subject). System.out.println("Constructing observerable (subject)."); ConcreteSubject subject = new ConcreteSubject(); // Add observer object references to the subject. System.out.println("Registering observers with subject."); subject.addObserver(observer1);

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