Problem Solving and Computing (CSC-103 98S)

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Using Java

There are two basic steps to running a Java program; you must compile the program and then interpret the compiled program. Compilation verifies the syntax of your program and translates your program into a language that the computer can more easily understand. The interpreter then executes this more easily understandable language.

To compile a program named, type

% /home/rebelsky/bin/jc
The "jc" stands for "Java compiler". If there are no observable errors in your program, you will see another prompt after about one minute. If there are observable errors in your program, the compiler will print a list of line/error pairs. Most people find the error messages unreadable, so feel free to ask me for help understanding them.

When compilation succeeds, the compiler creates a file called XXX.class. To execute the compiled program, type

% /home/rebelsky/bin/ji XXX
The "ji" stands for "Java interpreter".

Note that you are running special scripts designed for my class. If you would prefer to execute the actual Java compiler and interpreter, you'll need to make a few changes to your .cshrc file (this is only for more advanced students). The standard java compiler is called javac. The standard java interpreter is called java. Both can be found in /usr/local/java/bin

In order to use these, you will probably want to do the following.

The first time you make these changes, you'll need to reload your .cshrc file with
% source ~/.cshrc

If you attempt to run Java on the machines in the two back rows of the MathLAN classroom (Science 2435) you will get an error. Unfortunately, those machines do not have sufficient resources to run Java. On those machines, you will need to connect to another computer in order to run Java. We've set up a standard list of machines to connect to. Ask me if you need help connecting to another machine. You can also run
% /home/rebelsky/bin/alternate
to automatically connect to the appropriate machine.

Machine Connects to
robinson riemann
stokes euler
taylor gauss
venn mathieu
weyl banach
wronski goedel
young hardy
zorn fermat

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Disclaimer Often, these pages were created "on the fly" with little, if any, proofreading. Any or all of the information on the pages may be incorrect. Please contact me if you notice errors.

Source text last modified Fri Jan 16 09:33:50 1998.

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