javac版本和java版本在命令行上显示不同 [英] javac version and java version show different on command line

问题描述

之前，我有Java8.最近安装了Java11.我将路径Java\jdk-11.0.7\bin移到了环境变量的顶部.当我执行javac -version时，它会给我版本11.但是当我执行java -version时，它会给我版本8.我该如何纠正?具体来说，我想运行一个使用Java 11编译的jar文件.

Before, I had java 8. I recently installed java 11. I moved my path Java\jdk-11.0.7\bin to the top of my environment variables. When I do javac -version it gives me version 11. But when I do java -version, it gives me version 8. How do I correct this? Specifically, I want to run a jar file that was compiled using java 11.

推荐答案

无论何时安装JDK，它都会询问JRE的路径.您提到的JRE路径可能不同于JAVA_HOME，或者选择退出安装.如果发生这种情况，则应同时卸载Java 8和Java 11，然后再次安装Java 11.但是，在执行此操作之前，您可以尝试/确保以下操作:

Whenever you install JDK, it asks for the path of JRE as well. There is a possibility that you mentioned a different path for JRE than the JAVA_HOME or opted out the installation. If that happened, you should uninstall both, Java 8 and Java 11 and then install Java 11 again. However, before you do this, you can try/ensure the following things:

1. 如果将PATH设置为%JAVA_HOME%\bin，则如果安装路径(即JAVA_HOME的路径)有空间，则它将不起作用.在这种情况下，您需要在PATH环境变量中放置绝对路径而不是%JAVA_HOME%\bin.
2. 在新的cmd窗口中尝试命令.
3. 重新启动系统.
4. 将JDK bin的路径移至用户变量和系统变量的顶部.

1. If you have put the PATH as %JAVA_HOME%\bin, it won't work if the installation path (i.e. the path of JAVA_HOME) has space. In such a case, you need to put the absolute path instead of %JAVA_HOME%\bin in the PATH environment variable.
2. Try the commands in a new cmd window.
3. Restart the system.
4. Move the path of JDK bin to the top in both, User variables as well as System variables.

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