java 无法在 JRE7 中打开字符串
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Unable to switch on String in JRE7
提问by amnesyc
I'm on jre7 and I still can't switch on Strings. I installed jdk7 update 1 and pointed Eclipse to it but still no luck. Any idea what I'm doing wrong?
我在 jre7 上，但仍然无法打开字符串。我安装了 jdk7 update 1 并将 Eclipse 指向它，但仍然没有运气。知道我做错了什么吗？
Here is a the code:
这是一个代码：
String code = "something";
switch(code) {
case "xxx": dosomehting(); break;
default: dosomethingelse(); break;
}
The error I get:
我得到的错误：
Cannot switch on a value of type String. Only convertible int values or enum constants are permitted.
无法打开字符串类型的值。只允许使用可转换的 int 值或枚举常量。
回答by MTilsted
I am pretty sure that Eclipse 3.7 only support jdk 1.6. You need 3.7.1 according to http://download.eclipse.org/eclipse/downloads/drops/R-3.7.1-201109091335/index.php
我很确定 Eclipse 3.7 只支持 jdk 1.6。你需要 3.7.1 根据 http://download.eclipse.org/eclipse/downloads/drops/R-3.7.1-201109091335/index.php
(Remember: Eclipse don't use suns compiler, they use their own, so installing jdk 1.7 is not enough).
（记住：Eclipse 不使用 suns 编译器，他们使用自己的，所以安装 jdk 1.7 是不够的）。
Just open eclipse and select help->Check for updates. - That should upgrade you to 3.7.1
只需打开 eclipse 并选择帮助-> 检查更新。- 那应该将你升级到 3.7.1
回答by monksy
It sounds like you're still trying to compile under the old JDK [6 or earlier] Install the JDK, and make sure your Eclipse settings reflect the new platform. Additionally check if your project is reflecting the JDK7 platform.
听起来您仍在尝试在旧 JDK [6 或更早版本] 下编译 安装 JDK，并确保您的 Eclipse 设置反映新平台。另外检查您的项目是否反映了 JDK7 平台。
回答by Michael Berry
Three things spring to mind to check:
想到三件事需要检查：
- Make sure that Eclipse isn't still pointing to the old (6) install of the JDK.
- Make sure that you haven't selected a lower source level for compilation; eg. -source 1.6.
- Make sure you're using a version of Eclipse that supports Java 7 syntax.
- 确保 Eclipse 不仍然指向旧的 (6) JDK 安装。
- 确保您没有选择较低的源代码级别进行编译；例如。- 来源 1.6。
- 确保您使用的是支持 Java 7 语法的 Eclipse 版本。
