(if it includes a method call, it executes the called (if it is a method call, stops inside the called method) step to execute the current statement then stop.cont to continue execution after stopping at a breakpoint.clear : to delete the specified breakpoint.stop at : to set a breakpoint at the given line.to set a breakpoint at the entry of the given method run : to run your program with command-line arguments.run : to run your program from within JDB.help to list commands for which help information is available.Help will provide you with information about jdb has a dbx-like interface rather thanĪ gdb-like interface. Use jdb to set breakpoints, dump thread stacks, and step through theĮxecution. This will cause the java compiler to put Java source piler=NONE command line argument:Ĭompile with -g. The Java virtual machine in all-interpreted mode using the To get threadĭump information in terms of your Java source code, compile with -g and run Thread dump will likely contain lots of useless information. If your program terminates with a thread dump, and if you are using a just-in-time compiler Java VM (by default, JDK runs as just-in-time compiler VM), then the You need to add the current path otherwise the VM will not find classes in As a result, if you set this environment variable The paths listed in the CLASSPATH environment variable rather than searching If you have a CLASSPATH environment variable defined, then the VM uses Is set to two directories: the current directory (. :/home/newhall/public_html/cs35/book_classes/lib/jdsl_general.jarĮach path is separated by a ' :'. Library, and you will need to add this library's JAR file to your CLASSPATH. class files.Īfter the first few weeks of class, we will start using the book's JDSL A JAR file isĪ single file that contains many.
In addition, if your program uses classes contained in a JAR (Java ARchive)įile, then the JAR file must be listed in your CLASSPATH. The directories containing classes used by this application. You need to explicitly set your CLASSPATH environment variable to list all Program uses classes that are not in the current working directory, then Need to set a CLASSPATH environment variable the Java VM looks forĬlasses in the current working directory by default. To run a simple Java application, you do not class files using the paths listed in your CLASSPATHĮnvironment variable. When the Java VM runs your program it searches for application The CLASSPATH environment variable and JAR files The Java VM to run your application's byte-code:įor example, to run the main method from the FooĪny command line arguments (arguments to Foo's Once you have successfully compiled your Java source code, you can invoke More information on makefiles is available We suggest that you get in the habit of using makefiles for compiling
#Compiling java from the command line code#
java file additionally can contain code for protected javaįile where the first part of the file name is identical to the class name. The results of a successful compile of Foo.java will produceĪ byte-code version of the class in a file named Foo.class.Įvery public class that you write must be in a separate. class file forĮach class defined in the Foo.java source file). If there are no errors in your source file, the Java compiler will produce The -g command line option is optional, but we recommend Version of machine code the target machine is the Java VM rather than the Java source code must be compiled into byte-code using the Java IDE (like Eclipse) then you should look at its documentationįor information on using its editing and debugging features.īefore the Java virtual machine (VM) can run a Java program, the program's Debugging Threaded Programs NOTE: These instructions are for using Sun'sĭistribution of java (SDK) without an IDE.Compiling and Running Java Programs Compiling, Running and Debugging Java Programs
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