目标不同版本的JRE [英] Target different version of JRE

问题描述

我在Windows Surface Pro上测试Java。 Surface Pro有Java 7 Update 55，但没有安装了JDK。

I'm testing Java on a Windows Surface Pro. The Surface Pro has Java 7 Update 55, but does not have the JDK installed.

我从命令行在我的MacBook上编译了一个程序使用 javac 。 MacBook有Java 8 Update 5，它包括JDK（显然是因为我在MBP上编译）。

I compiled a program on my MacBook from the command line using javac. The MacBook Has Java 8 Update 5 and it includes the JDK (obviously because I compiled on the MBP).

当我将程序从MackBook移动到Surface Pro时，我得到以下错误。在这里，移动程序意味着将两个 *。class 文件复制到新机器并尝试执行字节代码。

When I move the program from the MackBook to the Surface Pro, I get the following error. Here, "moving the program" means copying the two *.class files to the new machine and trying to execute the byte codes.

java.lang.UnsupportedClassVersionError: HttpsTest : Unsupported major.minor version 52.

尝试使用目标信息编译会导致：

Trying to compile with target information results in:

$ javac -target 1.7 HttpsTest.java SSLSocketFactoryEx.java
javac: target release 1.7 conflicts with default source release 1.8

javac -help 不会列出任何控制编译程序（ target 除外）的版本信息的选项）。

javac -help does not list any options to control the version information of the compiled program (other than target, which does not appear to work).

如何为JRE的低级版本编译我的源文件？在这种情况下，我使用Java 8机器定位Java 7.。

How do I compile my source files for down level versions of a JRE? In this case, I'm targeting Java 7 from a Java 8 machine.

推荐答案

查看此页 http://docs.oracle.com/javase/8/docs/technotes/tools /windows/javac.html 特别指定源和目标选项。

See this page http://docs.oracle.com/javase/8/docs/technotes/tools/windows/javac.html especiallay the source and target options.

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