GWT 与 JDK 7 新功能的兼容性
例如，JDK 7 能够使用 switch(String)，而不仅仅是 switch(Number/Enum)。
如果我编写一个代码中有 switch(String) 的 GWT 客户端，会有什么问题吗？
switch(String) 是我能想到的问题之一。除了 switch(String) 之外还存在兼容性问题吗？
For example, JDK 7 is capable of switch(String) rather than just switch(Number/Enum).
If I wrote a GWT client that has switch(String) in its code, will there be any problems?
switch(String) is one of the issues I can think of. Are there compatibility issues beyond switch(String)?
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GWT 仅正式支持 Java 5。但它确实支持一些 Java 6，例如允许在实现接口方法的方法上使用
@Overrides和String.isEmpty（尽管如此）一个是关于运行时模拟的，所以它与语法和编译器无关）。顺便说一句，GWT 使用 Eclipse JDT 进行解析，并且尚未发布支持 Java 7 的 JDT（应该是 很快不过）。一旦完成，GWT 就必须更新以考虑 Java 7 添加的新“语法糖”。当那个时刻到来时（唉，可能不会很快到来），我打赌 switch-on-strings 将会考虑到 JavaScript 支持它，它是第一个受支持的功能（因此从 Java 转换为 JS 应该像整数开关一样容易）。
另请参阅 https://groups.google.com/d/topic /google-web-toolkit/dM8D9imIvAI/讨论
GWT only officially supports Java 5. It does support a few of Java 6 though, such as allowing
@Overrideson methods implementing an interface method, andString.isEmpty(though that one is about the runtime emulation, so it's not related to syntax and the compiler).BTW, GWT uses Eclipse JDT for parsing, and that one hasn't yet been released with support for Java 7 (should come really soon though). Once that's done, GWT would have to be updated to take into account the new "syntax sugar" added by Java 7. When that time come (which probably won't come anytime soon, alas), I bet switch-on-strings will be one of the first supported features, given that JavaScript supports it (so it should be as easy to translate from Java to JS as a switch on an integer).
See also https://groups.google.com/d/topic/google-web-toolkit/dM8D9imIvAI/discussion
由于最后的答案来自 2011 年 8 月，这里有 GWT 2.5 的更新：仍然不支持 Java 7，请参阅 GWT 2.5 RC2 发行说明（从 RC2 到 2.5 Final 没有任何变化）。
As the last answer is from August 2011, here's an update for GWT 2.5: still no support for Java 7, see Release Notes for GWT 2.5 RC2 (no change from RC2 to 2.5 final).
从GWT 2.6开始
2.6 发行说明
Starting from GWT 2.6
2.6 release notes
GWT 似乎即将推出 Java 7 支持 2.6。截至今天，该项目有三个候选版本可供下载 。我要等官方发布。
Looks like Java 7 support is coming in GWT 2.6. As of today, the project has three release candidates available for download. I'm going to wait for the official release.