java - 代号一构建错误 : suggesting "use -source 7"

Question

我正在使用 Eclipse 和 Codename One。当我构建应用程序时，出现以下错误:

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Buildfile: C:\P\eclipse_workspace\HelloWorld\build.xml

jar:
        [echo] Compile is forcing compliance to the supported API's/features for maximum device compatibility. This allows smaller
        [echo]          code size and wider device support
        [copy] Copying 3 files to C:\P\eclipse_workspace\HelloWorld\build\tmp
       [javac] C:\P\eclipse_workspace\HelloWorld\build.xml:147: warning: 'includeantruntime' was not set, defaulting to build.sysclasspath=last; set to false for repeatable builds
       [javac] Compiling 39 source files to C:\P\eclipse_workspace\HelloWorld\build\tmp
       [javac] warning: [options] source value 1.5 is obsolete and will be removed in a future release
       [javac] warning: [options] target value 1.5 is obsolete and will be removed in a future release
       [javac] warning: [options] To suppress warnings about obsolete options, use -Xlint:-options.
       [javac] C:\P\eclipse_workspace\HelloWorld\src\com\mycompany\lectures\Starter.java:197: error: strings in switch are not supported in -source 1.5
       [javac]      switch(option){
       [javac]            ^
       [javac]   (use -source 7 or higher to enable strings in switch)
       [javac] Note: Some input files use or override a deprecated API.
       [javac] Note: Recompile with -Xlint:deprecation for details.
       [javac] 1 error
       [javac] 3 warnings

BUILD FAILED
C:\P\eclipse_workspace\HelloWorld\build.xml:147: Compile failed; see the compiler error output for details.

Total time: 1 second
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如何在 Eclipse 中解决此问题？

谢谢!

Answer 1

确保您运行的是最新的 Java 版本 Java 8。您可以更新here ，如有必要。

打开build.xml并执行查找和替换。查找 1.5 并替换为 1.7 或 1.8(尽管您必须添加 build hint `java.version=8)。

右键单击您的项目并选择属性，从左侧 Pane 导航至源代码，然后将源代码/二进制格式更改为JDK 7 或 JDK 8(取决于您想要的版本)。

切换到源下的库，并将您的 Java 平台更改为最新版本