这条可能出看很简单，java程序的运行谁不会呢？不过很多时候， 我们只是单纯通过IDE去执行java程序，底层IDE又是如何执行java程序呢？很多人并不了解。

这个知识点是最最基本的java开发者需要掌握的，初学java，第一个肯定是教你如何在命令行中执行java程序，但是很多人一旦把java学完了，IDE用上了，就把这个都忘了。为什么强调要知道这个呢，知道了java最纯粹的启动方式之后，你才能在启动出问题的时候，去分析当时启动的目录多少，执行命名如何，参数如何，是否有缺失等。 这样有利于你真正开发中去解决那些奇奇怪怪的可能和环境相关的问题。

在这里需要掌握的知识有：javac 编译java文件为 class 文件、java 命令的使用， 带package的java类如何在命令行中启动、java程序涉及到的各个路径(classpath， java。library。path， java运行的主目录等)
https://www.linkedin.com/help/linkedin/answers/丽江高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/桂林高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/洛阳高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/保定高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/义乌高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/三亚高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/台州高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/珠海高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/惠州高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/嘉兴高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/绍兴高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/金华高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/厦门高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/大连高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/扬州高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/徐州高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/南通高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/常州高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/泉州高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/温州高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/佛山高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/无锡高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/深圳高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/乌鲁木齐高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/呼和浩特高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/西宁高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/西安高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/贵阳高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/海口高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/长沙高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/郑州高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/南昌高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/合肥高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/南京高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/长春高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/太原高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/银川高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/南宁高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/兰州高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/昆明高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/成都高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/武汉高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/广州高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/济南高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/福州高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/杭州高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/哈尔滨高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/沈阳高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/石家庄高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/重庆高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/上海高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/天津高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/北京高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/宁波高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/青岛高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/东莞高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/苏州高端外围【vx：5.2.2.0.5.2.6.4】
https://www.linkedin.com/help/linkedin/answers/丽江高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/桂林高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/洛阳高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/保定高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/义乌高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/三亚高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/台州高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/珠海高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/惠州高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/嘉兴高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/绍兴高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/金华高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/厦门高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/大连高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/扬州高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/徐州高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/南通高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/常州高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/泉州高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/温州高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/佛山高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/无锡高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/深圳高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/乌鲁木齐高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/呼和浩特高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/西宁高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/西安高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/贵阳高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/海口高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/长沙高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/郑州高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/南昌高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/合肥高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/南京高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/长春高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/太原高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/银川高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/南宁高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/兰州高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/昆明高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/成都高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/武汉高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/广州高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/济南高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/福州高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/杭州高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/哈尔滨高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/沈阳高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/石家庄高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/重庆高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/上海高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/天津高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/北京高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/宁波高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/青岛高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/东莞高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/苏州高端外围【vx：8.1.3.4.3.6.2.8】
https://www.linkedin.com/help/linkedin/answers/丽江高端外围【vx：9.2.3.6.8.1.8】
https://www.linkedin.com/help/linkedin/answers/桂林高端外围【vx：9.2.3.6.8.1.8】
https://www.linkedin.com/help/linkedin/answers/洛阳高端外围【vx：9.2.3.6.8.1.8】
https://www.linkedin.com/help/linkedin/answers/保定高端外围【vx：9.2.3.6.8.1.8】
https://www.linkedin.com/help/linkedin/answers/义乌高端外围【vx：9.2.3.6.8.1.8】
https://www.linkedin.com/help/linkedin/answers/三亚高端外围【vx：9.2.3.6.8.1.8】
https://www.linkedin.com/help/linkedin/answers/台州高端外围【vx：9.2.3.6.8.1.8】
https://www.linkedin.com/help/linkedin/answers/珠海高端外围【vx：9.2.3.6.8.1.8】
https://www.linkedin.com/help/linkedin/answers/惠州高端外围【vx：9.2.3.6.8.1.8】
https://www.linkedin.com/help/linkedin/answers/嘉兴高端外围【vx：9.2.3.6.8.1.8】
https://www.linkedin.com/help/linkedin/answers/绍兴高端外围【vx：9.2.3.6.8.1.8】
https://www.linkedin.com/help/linkedin/answers/金华高端外围【vx：9.2.3.6.8.1.8】
https://www.linkedin.com/help/linkedin/answers/厦门高端外围【vx：9.2.3.6.8.1.8】
https://www.linkedin.com/help/linkedin/answers/大连高端外围【vx：9.2.3.6.8.1.8】
https://www.linkedin.com/help/linkedin/answers/扬州高端外围【vx：9.2.3.6.8.1.8】
https://www.linkedin.com/help/linkedin/answers/徐州高端外围【vx：9.2.3.6.8.1.8】
https://www.linkedin.com/help/linkedin/answers/南通高端外围【vx：9.2.3.6.8.1.8】
https://www.linkedin.com/help/linkedin/answers/常州高端外围【vx：9.2.3.6.8.1.8】
https://www.linkedin.com/help/linkedin/answers/泉州高端外围【vx：9.2.3.6.8.1.8】
https://www.linkedin.com/help/linkedin/answers/温州高端外围【vx：9.2.3.6.8.1.8】
https://www.linkedin.com/help/linkedin/answers/佛山高端外围【vx：9.2.3.6.8.1.8】
https://www.linkedin.com/help/linkedin/answers/无锡高端外围【vx：9.2.3.6.8.1.8】
https://www.linkedin.com/help/linkedin/answers/深圳高端外围【vx：9.2.3.6.8.1.8】
https://www.linkedin.com/help/linkedin/answers/乌鲁木齐高端外围【vx：9.2.3.6.8.1.8】
https://www.linkedin.com/help/linkedin/answers/呼和浩特高端外围【vx：9.2.3.6.8.1.8】
https://www.linkedin.com/help/linkedin/answers/西宁高端外围【vx：9.2.3.6.8.1.8】
https://www.linkedin.com/help/linkedin/answers/西安高端外围【vx：9.2.3.6.8.1.8】
https://www.linkedin.com/help/linkedin/answers/贵阳高端外围【vx：9.2.3.6.8.1.8】
https://www.linkedin.com/help/linkedin/answers/海口高端外围【vx：9.2.3.6.8.1.8】
https://www.linkedin.com/help/linkedin/answers/长沙高端外围【vx：9.2.3.6.8.1.8】
https://www.linkedin.com/help/linkedin/answers/郑州高端外围【vx：9.2.3.6.8.1.8】
https://www.linkedin.com/help/linkedin/answers/南昌高端外围【vx：9.2.3.6.8.1.8】
https://www.linkedin.com/help/linkedin/answers/合肥高端外围【vx：9.2.3.6.8.1.8】
https://www.linkedin.com/help/linkedin/answers/南京高端外围【vx：9.2.3.6.8.1.8】
https://www.linkedin.com/help/linkedin/answers/长春高端外围【vx：9.2.3.6.8.1.8】
https://www.linkedin.com/help/linkedin/answers/太原高端外围【vx：9.2.3.6.8.1.8】
https://www.linkedin.com/help/linkedin/answers/银川高端外围【vx：9.2.3.6.8.1.8】
https://www.linkedin.com/help/linkedin/answers/南宁高端外围【vx：9.2.3.6.8.1.8】
https://www.linkedin.com/help/linkedin/answers/兰州高端外围【vx：9.2.3.6.8.1.8】
https://www.linkedin.com/help/linkedin/answers/昆明高端外围【vx：9.2.3.6.8.1.8】
https://www.linkedin.com/help/linkedin/answers/成都高端外围【vx：9.2.3.6.8.1.8】
https://www.linkedin.com/help/linkedin/answers/武汉高端外围【vx：9.2.3.6.8.1.8】
https://www.linkedin.com/help/linkedin/answers/广州高端外围【vx：9.2.3.6.8.1.8】
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https://www.linkedin.com/help/linkedin/answers/杭州高端外围【vx：9.2.3.6.8.1.8】
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