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If the compiler doesn't spit out any errors, it should have generated a ".class" file.
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Setting the path depends on a number of things. If you type "javac" and the command is not recognized, the compiler is not in your path.
COMPILING JAVA CODE CODE
cd into the directory where your code has been saved.For your first lab you should save the code as "smtpClient.java". If you are writing a class named Test, your file MUST be named Test.java. Important: The name of the file must be the class name with a. Use this as an opportunity to learn more about Java! But, you should be able to understand enough to modify the necessary portions for the assignment. We will talk more about sockets in class. You may not be able to fully understand all of the code. But, remember that you have a couple of things to modify. For your first lab, copy and paste the code from the tutorial web page. Open up your favorite text editor (I like emacs) and write your code.For example, if you have a package named "networks.webserver", all files in that package MUST be in a directory named "webserver" that is in a directory named "networks". But, if you do use packages, you must create a directory tree that matches your package name. For lab 1, you don't need to worry about packages. This step is more important if you are using packages. Optional: Create a new directory where you will store the files for the program.Give it a try and see if it can solve some of your problems.Compiling and Running a Java Program Using the Command Line Compiling and Running a Java Program Using the Command Line
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GCJ is one more choice for Java and free software developers. Disadvantages include the lack of AWT and Swing support. Obvious advantages of GCJ over the J2SE SDK include faster startup time, smaller memory footprint, shared memory between different native Java processes, and easier interface with other languages. It offers some unique characteristics that make it viable to use the Java programming language in situations where using the J2SE SDK is not feasible. GCJ is a capable, wide spread, free implementation of the Java platform. Notable entries include Ant, Log4j, JUnit, Rhino, Xalan-Java, Xerces2-J.Īs I am writing this article, reports surfaced on the Internet that GCJ can now run Eclipse, the Java based IDE. The rhug project provides a collection of such ports. Since GCJ is a free software implementation of Java, many free software Java packages have been ported to work with GCJ. Java printing: Hello from C++ Uses of GCJ c -o a/natAImpl.o a/A.cc # compile gcj -main=a.A -o a-A a/*.o -lstdc++ #. The gcj command is very similar to the gcc gcj -c -d. Remote object registry Compiling and Running Java Programs Generate stubs for Remote Method Invocation Java class files of core GCJ classes, automatically searched when compiling Java sourcesĬonvert file from one encoding to another Prints information about Java source files Prints information about Java class files Generates header files from Java class files GCJ has two parts: the compiler and the runtime support library. The differences between platforms are mostly limited to filename extensions. A First Look at GCJįor the rest of the article, I will use Red Hat Linux 8.0 as my platform.
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Users of other platforms may get binary distributions of GCC from their favorite download centers.
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Windows users need to visit the MinGW Download page and get the following two files:Īnd install both into a common directory ( C:\MinGW will work fine.) Other Platforms To install GCJ on a Red Hat Linux 8.0 system, simply run GCC is bundled with most Linux distributions. In this article, I will first take you on a tour of GCJ basics, and then show some more advanced features. However most other Java features are supported, including collections, networking, reflection, serialization, JNI and RMI. GCJ's Java implementation is not complete.
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GCJ native code can be executables or shared libraries. It can also compile Java bytecode to native machine code. It can compile Java source code to either Java bytecode (class files) or native machine code. Support for Windows using MinGW is also available. Currently at version 3.2.1, it is supported on GNU/Linux on Pentium, Itanium, Alpha, PowerPC and AMD Hammer, FreeBSD on Pentium, Solaris on SPARC and more. GCJ, a radically traditional (*) Free Software implementation of the Java language, has been part of GCC since the 3.0 release in June 2001. By Weiqi Gao, OCI Principal Software Engineer