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JavaObjectQ[expr]

gives True if expr is a reference to a Java object or Null, and gives False otherwise.

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JavaObjectQ

JavaObjectQ[expr]

gives True if expr is a reference to a Java object or Null, and gives False otherwise.

更多信息和选项

Wolfram Research (2007)，JavaObjectQ，Wolfram 语言函数，https://reference.wolfram.com/language/JLink/ref/JavaObjectQ.html.

文本

Wolfram Research (2007)，JavaObjectQ，Wolfram 语言函数，https://reference.wolfram.com/language/JLink/ref/JavaObjectQ.html.

CMS

Wolfram 语言. 2007. "JavaObjectQ." Wolfram 语言与系统参考资料中心. Wolfram Research. https://reference.wolfram.com/language/JLink/ref/JavaObjectQ.html.

APA

Wolfram 语言. (2007). JavaObjectQ. Wolfram 语言与系统参考资料中心. 追溯自 https://reference.wolfram.com/language/JLink/ref/JavaObjectQ.html 年

BibTeX

@misc{reference.wolfram_2025_javaobjectq, author="Wolfram Research", title="{JavaObjectQ}", year="2007", howpublished="\url{https://reference.wolfram.com/language/JLink/ref/JavaObjectQ.html}", note=[Accessed: 02-May-2026]}

BibLaTeX

@online{reference.wolfram_2025_javaobjectq, organization={Wolfram Research}, title={JavaObjectQ}, year={2007}, url={https://reference.wolfram.com/language/JLink/ref/JavaObjectQ.html}, note=[Accessed: 02-May-2026]}