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Understanding Package-Derived Classes
The Swing API makes excellent use of subpackages, with 16 of them total in Java SE 6. As mentioned earlier, when common classes are separated into their own packages, code usability and maintainability is enhanced. Swing takes advantage of the model-view-controller architecture (MVC). The model represents the current state of each component. The view is the representation of the components on the screen. The controller is the functionality that ties the UI components to events. While understanding the underlying architecture of Swing is important, it s not necessary for the exam. For comprehensive information on the Swing API, look to the book Swing: A Beginner s Guide, by Herbert Schildt (McGraw-Hill Professional, 2007).
Be familiar with the package prefixes java and javax.The prefix java is commonly used for the core packages.The prefix javax is commonly used for packages comprised of Java standard extensions.Take special notice of the prefix usage in the AWT and Swing APIs: java.awt and javax.swing.
exerCIse 1-2 Understanding extended Functionality of the Java Utilities apI
In Java SE 6, a total of ten packages are in direct relationship to the Java Utilities API, with the base package being named java.util. J2SE 5.0 has only nine packages; J2SE 1.4, just six. This exercise will have you exploring the details of the Java Utilities API subpackages that were added in subsequent releases of the Java SE 1.4 platform. 1. Go to the online J2SE 1.4.2 API specification: http://java.sun.com/j2se/1.4.2/ docs/api/. 2. Use the web browser s scroll bar to scroll down to the Java Utilities API packages. 3. Click the link for each related package. Explore the details of the classes and interfaces within each package.
1:
Packaging, Compiling, and Interpreting Java Code
4. Go to the online J2SE 5.0 API specification: http://java.sun.com/j2se/1.5.0/ docs/api/. This is the API specification you should be referencing for the exam. It is shown in the following illustration.
5. Use the web browser s scroll bar to scroll down to the Java Utilities API packages. 6. Determine which three new subpackages were added to the Java Utilities API. Click the link for each of these new packages. Explore the details of the classes and interfaces within each package. 7. Go to the online Java SE 6 API specification: http://java.sun.com/javase/6/ docs/api/.
Compiling and Interpreting Java Code
8. Use the web browser s scroll bar to scroll down to the Java Utilities API packages. 9. Determine which new subpackage was added to the Java Utilities API. Click the link for the new package. Explore the details of the classes within the package.
CertIFICatION OBJeCtIVe
Compiling and Interpreting Java Code
Exam Objective 5.2 Demonstrate the proper use of the javac command (including the command-line options: -d and classpath) and demonstrate the proper use of the java command (including the command-line options: -classpath, -D and version). The Java Development Kit includes several utilities for compiling, debugging, and running Java applications. This section details two utilities from the kit: the Java compiler and the Java interpreter. For more information on the JDK and its other utilities, see 10.
Java Compiler
We will need a sample application to use for our Java compiler and interpreter exercises. We shall employ the simple GreetingsUniverse.java source file, shown here in the following listing, throughout the section.
public class GreetingsUniverse { public static void main(String[] args) { System.out.println("Greetings, Universe!"); } }
Let s take a look at compiling and interpreting simple Java programs along with their most basic command-line options.
1:
Packaging, Compiling, and Interpreting Java Code
Compiling Your source Code
The Java compiler is only one of several tools in the JDK. When you have time, inspect the other tools resident in the JDK s bin folder, as shown in Figure 1-7. For the scope of the SCJA exam, you will only need to know the details surrounding the compiler and interpreter. The Java compiler simply converts Java source files into bytecode. The Java compiler s usage is as follows:
javac [options] [source files]
The most straightforward way to compile a Java class is to preface the Java source files with the compiler utility from the command line: javac.exe FileName. java. The .exe is the standard executable file extension on Windows machines and is optional. The .exe extension is not present on executables on Unix-like systems.
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