Proposed refactoring: introduce JLS7 language features to core libs

[Stefan Reich]

Hello,

is there any interest to accept change sets based on OpenJDK 7 that update the java classes in jdk/src/share/classes to use 

* multi-catch
* string switch statements as opposed to nested if statements when comparing strings with string literals
* type inference by removing duplicative type information in the constructor when using generics 
* indexOf(int) when indexOf(String) is used with a String literal that contains only one character, and similar small-scale improvements?

The proposed change sets would pass all jtreg tests. If there is interest, what would be next steps?

Regards,
Stefan Reich