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Since the late 1990s, the execution speed of Java programs improved significantly via introduction of just-in-time compilation (JIT) (in 1997 for Java 1.1), [2] [3] [4] the addition of language features supporting better code analysis, and optimizations in the JVM (such as HotSpot becoming the default for Sun's JVM in 2000).
C++ (pre-C++11) does not specify whether or not these operators truncate to zero or "truncate to -infinity". -3/2 will always be -1 in Java and C++11, but a C++03 compiler may return either -1 or -2, depending on the platform. C99 defines division in the same fashion as Java and C++11.
System cost or reliability may be more important than the code speed. For example, compilers for embedded software usually offer options that reduce code size at the expense of speed. The code's timing may need to be predictable, rather than as fast as possible, so code caching might be disabled, along with compiler optimizations that require it.
While Java does clean up some warts in C++ (the static keyword comes to mind), Java is more of a dumped-down version of C++ than an advance (very limited static polymorphism, little metaprogramming, no RAII, no unsigned arimetric, no const, no operator overloading and so on and on) plus a few extra features (e.g. platform independent bytecode ...
The earliest published JIT compiler is generally attributed to work on LISP by John McCarthy in 1960. [4] In his seminal paper Recursive functions of symbolic expressions and their computation by machine, Part I, he mentions functions that are translated during runtime, thereby sparing the need to save the compiler output to punch cards [5] (although this would be more accurately known as a ...
HotSpot, Java SE embedded edition Sun Microsystems, Oracle: 27 April 1999 ? ? Commercial Proprietary [5] HotSpot, Zero port Gary Benson [6]? ? ? Free GPL version 2 only IKVM.NET: Jeroen Frijters 28 June 2004 7.0.4335.0 5 December 2011 Free zlib License [7] JAmiga: Peter Werno, Joakim Nordström 19 May 2005 [8] 1.2 6 January 2014 Free GPL ...
Java has strong IDE support, due not only to its historical and economic importance, but also due to a combination of reflection and static-typing making it well-suited for IDE support. [ fact or opinion?
The designers chose to address this problem with a four-step solution: 1) Introducing a compiler switch that indicates if Java 1.4 or later should be used, 2) Only marking assert as a keyword when compiling as Java 1.4 and later, 3) Defaulting to 1.3 to avoid rendering prior (non 1.4 aware code) invalid and 4) Issue warnings, if the keyword is ...