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How do programs use other programs that aren’t in the same language?
For example, Windows is in C++ but the kernel is in C.
I’ve also seen Java programs use C programs as well.
How do they do this?
Do they use master classes? Like class Whatever : MasterClassName?
I’m not sure what you mean when you say you’ve seen a Java program use a C program. Do you mean a Java program use an executable that was generated from C code?
On a slightly different note, two programs can communicate with each other through, among other things, a DLL, a socket interface (TCP/UDP), a file, a database, and/or CORBA.