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Write once, run anywhere - Wikipedia

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From Wikipedia, the free encyclopedia

Slogan for the Java Platform

Write once, run anywhere (WORA), or sometimes Write once, run everywhere (WORE), was a 1995[1] slogan created by Sun Microsystems to illustrate the cross-platform benefits of the Java programming language.[2][3] Ideally, this meant that a Java program could be developed on any device, compiled into standard bytecode, and be expected to run on any device equipped with a Java virtual machine (JVM). The installation of a JVM or Java interpreter on chips, devices, or software packages became an industry standard practice.

The catch is that since there are multiple JVM implementations, on top of a wide variety of different operating systems, there could be subtle differences in how a program executes on each JVM/OS combination, possibly requiring an application to be tested on each target platform. This gave rise to a joke among Java developers: Write once, debug everywhere.[4]

In comparison, the Squeak Smalltalk programming language and environment boasts of being truly write once, run anywhere,[5] because it runs bit-identical images across its wide portability base.[6]


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