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A programmer could develop code on a [[Personal computer|PC]] and expect it to run on Java-enabled [[Mobile phone|mobile phones]], as well as on [[Router (computing)|router]]s and [[mainframe computer|mainframe]]s equipped with Java, without any adjustments. This was intended to save software developers the effort of writing a different version of their software for each [[Platform (computing)|platform]] or [[operating system]] they intend to deploy on.
This idea originated as early as in the late 1970s, when the [[UCSD Pascal]] system was developed to produce and interpret [[P-code machine|p-code]]. UCSD Pascal (along with the Smalltalk virtual machine) was a key influence on the design of the JVM, as is cited by [[James Gosling|James]]
[[James Gosling|Gosling]].{{citation needed|date=January 2010}} 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."<ref>{{cite web
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