根据 The Java Tutorials , 在 Java SE 7之后，您可以在 switch 语句的表达式中使用 String 对象。
String s = ...
switch(s){
//do stuff
}
但这是真的吗？我已经安装了 JRE 并将其添加到我的 Eclipse 项目的构建路径中，但我收到以下编译时错误:
Cannot switch on a value of type String. Only convertible int values or enum constants are permitted
另外，我认为我已经正确配置了它，因为我能够使用它的 java.nio.file.Files 类，以及 JLayer。
有什么想法吗？
最佳答案
虽然 JDT 团队确实实现了 Switch on String feature ，Eclipse 3.7.1之前不会支持Java 7:
参见 bug 288548 :
Due to late availability of JSR-292 (Invoke Dynamic) and JSR-334 (Project Coin) and due to the official release date (July 28, 2011) of Java 7 being after 3.7 ships we had to defer the Java 7 support to 3.7.1. It has not yet been decided whether this will be available as part of the 3.7.1 downloads or as separate feature update.
The work for the Java 7 features is currently in progress in the 'BETA_JAVA7' branch and we will deliver separate updates for the stable builds in order to provide early access to the Java 7 features for interested parties.
关于带有字符串的 Java 7 switch 语句不起作用，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/6231907/