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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.
Java: Application, business, client-side, general, mobile development, server-side, web Yes Yes Yes Yes Yes Yes Concurrent De facto standard via Java Language Specification JavaScript: Client-side, server-side, web Yes Yes Yes Yes No Yes prototype-based: Yes 1997-2022, ECMA-262: Joy: Research No No Yes No No No Stack-oriented No jq "awk for ...
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 ...
Loop unrolling, also known as loop unwinding, is a loop transformation technique that attempts to optimize a program's execution speed at the expense of its binary size, which is an approach known as space–time tradeoff. The transformation can be undertaken manually by the programmer or by an optimizing compiler.
A tiny Java web test framework built to use WebDriver/HTMLUnit within BeanShell scripts Cactus: A JUnit extension for testing Java EE and web applications. Cactus tests are executed inside the Java EE/web container. Concordion [298] Acceptance test-driven development, Behavior-driven development, Specification by example: Concutest [299]
Java has been demonstrated to run at a speed comparable with optimized native code, and modern JVM implementations are regularly benchmarked as one of the fastest language platforms available – typically no more than three times slower than C and C++. [34] Performance has improved substantially since early versions. [35]