Application Client in Java

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Sometimes, enterprise applications use a stand-alone client application for handling tasks such as system or application administration For example, the Duke s Bank application uses a J2EE application client to manually administer customers and accounts This capability is useful in the event the site becomes inaccessible for any reason or a customer prefers to communicate things such as changes to account information by phone A J2EE application client is a standalone program launched from the command line or desktop; it accesses enterprise beans running on the J2EE application server
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APPLICATION CLIENT
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The application client shown in Figure 18 4 handles basic customer and account administration for the banking application through a Swing user interface The bank administrator can perform any of the following functions by making menu selections
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Figure 18 4 Application Client
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Customer Administration View customer information Add a new customer to the database Update customer information Find customer ID
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Account Administration Create a new account Add a new customer to an existing account View account information Remove an account from the database
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THE DUKE S BANK APPLICATION
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The Classes and Their Relationships
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The J2EE application client is divided into three classes: , , and ; the relationships among the classes are depicted in Figure 18 5
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Figure 18 5 Relationships among Classes
builds the initial user interface, creates the object, and provides methods for the and objects to call to update the user interface listens for button clicks by the user, takes action based on which button the user clicks, creates the object, calls methods in the object to write data to and read data from the underlying database, and calls methods in the object to update the user interface when actions complete
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The method creates instances of the and classes Arguments passed to the method are used to initialize a locale, which is passed to the constructor