用Java 8 JDK编译java 6安装

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我需要使用Java 6为大学编译我的源代码.我目前在我的PC(Linux)上安装了Java 8 JDK.如何在Java 6中编译？

附：我知道我不能使用任何Java 7或8功能.

p.p.s.我意识到Java 6源代码将使用Java 8 JDK编译得很好但是我发现在家里编译时我不小心在我的程序中使用了后Java 6功能.当我尝试在uni的实验室计算机上编译源代码时,我遇到了一堆错误.例如无法将对象强制转换为基元.

解决方法:

解决该问题的方法是使用更高版本的SDK进行编译,并在编译时使用cross compilation options.

Cross-Compilation Options

By default, classes are compiled against the bootstrap and extension classes of the platform that javac shipped with. But javac also supports cross-compiling, where classes are compiled against a bootstrap and extension classes of a different Java platform implementation. It is important to use the -bootclasspath and -extdirs options when cross-compiling.

-target version

Generates class files that target a specified release of the virtual machine. Class files will run on the specified target and on later releases, but not on earlier releases of the JVM. Valid targets are 1.1, 1.2, 1.3, 1.4, 1.5 (also 5), 1.6 (also 6), 1.7 (also 7), and 1.8 (also 8).

The default for the -target option depends on the value of the -source option:

• If the -source option is not specified, then the value of the -target option is 1.8
• If the -source option is 1.2, then the value of the -target option is 1.4
• If the -source option is 1.3, then the value of the -target option is 1.4
• If the -source option is 1.5, then the value of the -target option is 1.8
• If the -source option is 1.6, then the value of the -target is option 1.8
• If the -source option is 1.7, then the value of the -target is option 1.8
• For all other values of the -source option, the value of the -target option is the value of the -source option.

-bootclasspath bootclasspath

Cross-compiles against the specified set of boot classes. As with the user class path, boot class path entries are separated by colons (:) and can be directories, JAR archives, or ZIP archives.

要完全正确地使用这些选项(即也使用-bootclasspath选项),需要目标版本的JRE(而不是JDK)的rt.jar.

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