java 管理多个版本的JDK：无效的源发布错误
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managing multiple versions of JDK: invalid source release error
提问by John
I have jdk 1.6 and 1.7 installed.
我安装了 jdk 1.6 和 1.7。
I have updated my JAVA_HOME variable to
我已将 JAVA_HOME 变量更新为
C:\Program Files\Java\jdk1.6.0_24;C:\Program Files\Java\jdk1.7.0
But when I try to run java code.
但是当我尝试运行 java 代码时。
>javac -version
javac 1.6.0_24
>java -version
java version "1.7.0_09"
>javac -source 1.7.0 -target 1.7.0 Test.java
javac: invalid source release: 1.7.0
回答by cutebug
Your jdk is still pointing to JDK 1.6. javac is bundled with jdk, while java -version ideally runs even if jre is installed properly.
您的 jdk 仍然指向 JDK 1.6。javac 与 jdk 捆绑在一起，而 java -version 即使正确安装了 jre 也能正常运行。
回答by Y?co
The simplest solution would be to use the java_home tool.
最简单的解决方案是使用 java_home 工具。
/usr/libexec/java_home -v 1.7.0_51 --exec javac -version
回答by Anders Petersson
Your "javac -version" test shows that you are using javac 1.6. Then you are trying to build for 1.7 which is a future version that is unknown to the 1.6 compiler. I would do as some comments suggests and only define one JDK for a given project.
您的“javac -version”测试表明您使用的是 javac 1.6。然后您正在尝试为 1.7 构建，这是 1.6 编译器未知的未来版本。我会按照一些评论的建议去做，并且只为给定的项目定义一个 JDK。
回答by semTex
What about javac -source 1.7 -target 1.7 Test.java?
怎么样javac -source 1.7 -target 1.7 Test.java？
