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Java interpreter performs on-the-fly runtime execution of the Java bytecodes which can result in a satisfactory performance.
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There are 3 ways of executing Java
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Interpreter through a Browser -- Java approximately 50 times slower than C
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"Just-in-time" (JIT) Interpreter on a browser -- Java approximately 4 times slower than C
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This is essentially an on the fly compiler as a JIT Interpreter saves code for repeated sections to provide compiled (without complex optimizations) code efficiency after first execution
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Compiler for generating native machine code out of Java or Java bytecodes, viewed as intermediate compiler form
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One expects that native compilers will be comparable to C or Fortran in performance
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As Java has no pointers, compiled code should be faster in many cases than C or C++
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