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javac GreetingsUniverse.java
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This will result in a bytecode file being produced with the same preface, such as GreetingsUniverse.class. This bytecode file will be placed into the same folder as the source code, unless the code is packaged and/or it s been told via a command-line option to be placed somewhere else.
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Most projects use Integrated Development Environments (IDEs) to compile and execute code. The clear benefit in using IDEs is that building and running code can be as easy as stepping through a couple of menu buttons or even just hitting a hot key. The disadvantage is that even though you may establish your settings through a configuration dialog box and see the commands and subsequent arguments in one of the workspace windows, you are not getting direct experience in repeatedly creating the complete structure of the commands and associated arguments by hand. The exam is structured to validate that you have experience in scripting compiler and interpreter invocations. Do not take this prerequisite lightly. Take the exam only after you have mastered when and how to use the tools, switches, and associated arguments. At a later time, you can consider taking advantage of the shortcut features of popular IDEs such as those provided by NetBeans, Eclipse, IntelliJ IDEA, and JDeveloper.
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Compiling Your source Code with the -d Option
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You may wish to explicitly specify where you would like the compiled bytecode class files to go. You can accomplish this using the -d option.
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javac -d classes GreetingsUniverse.java
This command-line structure will place the class file into the classes directory, and since the source code was packaged (that is, the source file included a package statement), the bytecode will be placed into the relative subdirectories.
[present working directory]\classes\com\scjaexam\tutorial\ GreetingsUniverse.class
Compiling Your Code with the -classpath Option
If you wish to compile your application with user-defined classes and packages, you may need to tell the JVM where to look by specifying them in the classpath. This classpath inclusion is accomplished by telling the compiler where the desired classes and packages are with the -cp or -classpath command-line option. In the
1:
Packaging, Compiling, and Interpreting Java Code
following compiler invocation, the compiler includes in its compilation any source files that are located under the 3rdPartyCode\classes directory, as well as any classes located in the present working directory (the period). The -d option (again) will place the compiled bytecode into the classes directory.
javac -d classes -cp 3rdPartyCode\classes\;. GreetingsUniverse .java
Note that you do not need to include the classpath option if the classpath is defined with the CLASSPATH environment variable, or if the desired files are in the present working directory. On Windows systems, classpath directories are delimited with backward slashes, and paths are delimited with semicolons:
-classpath .;\dir_a\classes_a\;\dir_b\classes_b\
On POSIX-based systems, classpath directories are delimited with forward slashes and paths are delimited with colons:
-classpath .:/dir_a/classes_a/:/dir_b/classes_b/
Again, the period represents the present (or current) working directory.
Know your switches.The designers of the exam will try to throw you by presenting answers with mix-matching compiler and interpreter switches. You may even see some make-believe switches that do not exist anywhere. For additional preparation, query the commands complete set of switches by typing java -help or javac -help . Switches are also known as command-line parameters, command-line switches, options, and flags.
Java Interpreter
Interpreting the Java files is the basis for creating the Java application, as shown in Figure 1-8. Let s examine how to invoke the interpreter and its command-line options.
java [-options] class [args ]
Compiling and Interpreting Java Code
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Bytecode conversion
GreetingsUniverse.java
Compiler (javac)
GreetingsUniverse.class
Interpreter (java)
GreetingsUniverse application
Interpreting Your Bytecode
The Java interpreter is invoked with the java[.exe] command. It is used to interpret bytecode and execute your program. You can easily invoke the interpreter on a class that s not packaged as follows:
java MainClass
You can optionally start the program with the javaw command on Microsoft Windows to exclude the command window. This is a nice feature with GUI-based applications since the console window is often not necessary.
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