Essentials of the Java Programming Language: A Hands-On by Monica Pawlan

By Monica Pawlan

Hundreds of thousands of programmers are looking to research Java quickly, hands-on -- with as little complexity and conception as attainable. For them, necessities of the JavaaA A Programming Language is definitely the right place to begin. in keeping with Monica Pawlan's wildly-popular internet instructional, this available, "learn-by-doing" advisor covers all of the basics via jogging via an easy application that delicately grows right into a full-fledged eCommerce program which illustrates Java 2's most crucial programming recommendations and ideas. within the first 1/2 the publication, builders grasp key necessities equivalent to: development uncomplicated person interfaces; analyzing and writing facts to documents and databases; sending and receiving facts throughout networks through RMI and sockets; compiling and operating courses; and the variations among functions, applets, servlets, and JavaServer Pages. subsequent, Pawlan introduces extra complex thoughts. in precisely three hundred pages, builders get an entire, exact, real-world grounding in Java -- all they should get effects quick, and shorten their studying curve as they stream into extra subtle Java improvement. for each programmer trying to examine Java speedy and simply.

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However, if you run the applet without a policy file, you get a stack trace indicating permission errors. The Granting Applets Permission section in Lesson 6 introduced you to policy files and how to launch an applet with the permission it needs. The Lesson 6 applet example provided the policy file and told you how to launch the applet with it. This lesson shows you how to read the stack trace to determine the permissions you need in a policy file. 2000 12:30:35] Java(TM) Language Basics, Part 1, Lesson 7: Database Access and Permissions database access applet: one uses the JDBC driver, and the other uses the the JDBC-ODBC bridge with an Open DataBase Connectivity (ODBC) driver.

UnicastRemoteObject class RemoteServer extends UnicastRemoteObject implements Send { String text; public RemoteServer() throws RemoteException { super(); } public void sendData(String gotText){ text = gotText; } public String getData(){ return text; } The main method installs the RMISecurityManager and opens a connection with a port on the machine where the server program runs. The security manager determines whether there is a policy file that lets downloaded code perform tasks that require permissions.

A database driver is software that lets a program establish a connection with a database. If you do not have the right driver for the database to which you want to connect, your program will be unable to establish the connection. Drivers either come with the database or are available from the Web. If you install your own database, consult the documentation for the driver for information on installation and any other environment settings you need for your platform. If you are using a database at work, consult your database administrator for this information.

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