Java still lets you make a giant array and operate on that. For high speed numerics programming you do that in every language: FORTRAN, C, Java, etc. At that po

Java still lets you make a giant array and operate on that. For high speed numerics programming you do that in every language: FORTRAN, C, Java, etc. At that point comes down to how much information the compiler and you can share: restricted pointers, use assembler kernels, etc.