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The Web integration of Java gives it excellent "network" classes and support for message passing.
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Thus "Java plus message passing" form of parallel computing is actually somewhat easier than in Fortran or C.
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Coarse grain parallelism very natural in Java and we have illustrated this with WebFlow
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"Data Parallel" languages features are NOT in Java and have to be added extending ideas from HPF and HPC++ etc
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e.g. NPAC's HPJava translates to Java+Messaging just as HPF translates to Fortran plus message passing
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Java has built in "threads" and a given Java Program can run multiple threads at a time
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In Web use, allows one to process Image in one thread, HTML page in another etc.
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threads can be used to do more general parallel computing but only on shared memory computers
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