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Similarly, on POSIX-based systems, you can use the ampersand to run the application as a background process.
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When interpreting your code, you may need to define where certain classes and packages are located. You can find your classes at runtime when you include the -cp or -classpath option with the interpreter. If the classes you wish to include are packaged, then you can start your application by pointing the full path of the application to the base directory of classes, as in the following interpreter invocation:
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java -cp classes com.scjaexam.tutorial.MainClass
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The delimitation syntax is the same for the -cp and -classpath options, as defined earlier in the Compiling Your Code with the -classpath Option section.
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The -D command-line option allows for the setting of new property values. The usage is as follows:
java -D<name>=<value> class
The following single-file application comprised of the PropertiesManager class prints out all of the system properties.
import java.util.Properties; public class PropertiesManager { public static void main(String[] args) { Properties props = System.getProperties(); /* New property example */ props.setProperty("new_property2", "new_value2"); if (args[0].equals("-list_all")) { props.list(System.out); // Lists all properties } else if (args[0].equals("-list_prop")) { /* Lists value */ System.out.println(props.getProperty(args[1])); } else { System.out.println("Usage: java PropertiesManager [-list_all]"); System.out.println(" java PropertiesManager [-list_prop [property]]"); } } }
Let s run this application while setting a new system property called new_property1 to the value of new_value1 .
java -Dnew_property1=new_value1 PropertiesManager -list_all
You ll see in the standard output that the listing of the system properties includes the new property that we set and its value.
new_property1=new_value1 java.specification.name=Java Platform API Specification
Optionally, you can set a value by instantiating the Properties class, and then setting a property and its value with the setProperty method.
Compiling and Interpreting Java Code
To help you conceptualize system properties a little better, Table 1-5 details a subset of the standard system properties.
retrieving the Version of the Interpreter with the -version Option
The -version command-line option is used with the Java interpreter to return the version of the JVM and exit. Don t take the simplicity of the command for granted, as the designers of the exam may try to trick you by including additional arguments after the command. Take the time to toy with the command by adding arguments and placing the -version option in various places. Do not make any assumptions about how you think the application will respond. Figure 1-9 demonstrates varying results based on where the -version option is used.
taBle 1-5
Subset of System Properties
system property
file.separator java.class.path java.class.version java.home java.vendor java.vendor.url java.version line.separator os.arch os.name os.version path.separator user.dir user.home user.language user.name user.timezone
property Description
The platform specific file separator ( / for POSIX, \ for Windows) The classpath as defined for the system s environment variable The Java class version number The directory of the Java installation The vendor supplying the Java platform The vendor s Uniform Resource Locator The version of the Java Interpreter/JVM The platform-specific line separator ( \r on Mac OS 9, \n for POSIX, \r\n for Microsoft Windows) The architecture of the operating system The name of the operating system The version of the operating system The platform-specific path separator ( : for POSIX, ; for Windows) The current working directory of the user The home directory of the user The language code of the default locale The username for the current user The system s default time zone
1:
Packaging, Compiling, and Interpreting Java Code
FIgUre 1-9
The -version command-line option
Check out the other JDK utilities at your disposal. You can find them in the bin directory of your JDK. JConsole in particular is a valuable GUI-based tool that is used to monitor and manage Java applications. Among the many features, JConsole allows for viewing memory and thread usages. JConsole was released with J2SE 5.0.
exerCIse 1-3 Compiling and Interpreting packaged software
When you compile and run packaged software from an IDE, it can be as easy as clicking a run icon as IDE s support, setting the necessary paths that will be used by the compiler and interpreters. However, when you try to compile and interpret the code yourself from the command line, you will need to know exactly how to path your files. Consider our sample application that is now placed in the com.scjaexam.tutorial package.
package com.scjaexam.tutorial; public class GreetingsUniverse { public static void main(String[] args) { System.out.println("Greetings, Universe!"); } }
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