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The Statement object is used whenever a J2ME application needs to execute a query immediately without first having the query compiled The Statement object contains the executeQuery() method, which is passed the query as an argument The query is then transmitted to the DBMS for processing The executeQuery() method returns one ResultSet object that contains rows, columns, and metadata that represent data requested by the query The ResultSet object also contains methods that are used to manipulate data in the ResultSet, which you ll learn about later in this chapter The execute() method of the Statement object is used when multiple results may be returned A third commonly used method of the Statement object is the executeUpdate() method The executeUpdate() method is used to execute queries that contain UPDATE and DELETE SQL statements, which change values in a row and remove a row, respectively The executeUpdate() method returns an integer indicating the number of rows that were updated by the query ExecuteUpdate() is used to INSERT, UPDATE, DELETE, and DDL statements Listing 10-9 is an enhanced version of Listing 10-2, used earlier in this chapter to illustrate how to open a database connection The enhancements are to create a query, execute the query, and return a ResultSet Two new objects are declared in Listing 10-9: a Statement object called DataRequest and a ResultSet object called Results In the second try {} block, the query is assigned to the String object query The query requests that the DBMS return all the rows from the Customers table of the CustomerInformation database Next, the createStatement() method of the Connection object is called to return a Statement object The executeQuery() method of the Statement object is passed the query

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An interface is defined much like a class This is the general form of an interface: access interface name { return-type method-name1(parameter-list); return-type method-name2(parameter-list); type final-varname1 = value; type final-varname2 = value; // return-type method-nameN(parameter-list); type final-varnameN = value; } When no access specifier is included, then default access results, and the interface is only available to other members of the package in which it is declared When it is declared as public, the interface can be used by any other code In this case, the interface must be the only public interface declared in the file, and the file must have the same name as the interface name is the name of the interface, and can be any valid identifier Notice that the methods that are declared have no bodies They end with a semicolon after the parameter list They are, essentially, abstract methods; there can be no default implementation of any method specified within an interface Each class that includes an interface must implement all of the methods Variables can be declared inside of interface declarations They are implicitly final and static, meaning they cannot be changed by the implementing class They must also be initialized All methods and variables are implicitly public Here is an example of an interface definition It declares a simple interface that contains one method called callback( ) that takes a single integer parameter

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interface Callback { void callback(int param); }

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