jdk7 新特性

jdk7 新特性

1. try with resources or ARM(Automatic Resource Management)
   BufferedReader br = new BufferedReader(new FileReader(path));
try {
return br.readLine();
} finally {
br.close();
}

   become:
   try (BufferedReader br = new BufferedReader(new FileReader(path)) {
return br.readLine();
}


2. Strings in switch Statement

   String s = ...switch(s) { case "quux":    processQuux(s);    // fall-through  case "foo":  case "bar":    processFooOrBar(s);    break;  case "baz":     processBaz(s);    // fall-through  default:    processDefault(s);    break;}

3. Multiple Exception Handling(convinent for rethrow)
   } catch (FirstException ex) {
logger.error(ex);
throw ex;
} catch (SecondException ex) {
logger.error(ex);
throw ex;
}

4. Type Inference for Generic Instance Creation using Diamond Synatax
   
} catch (FirstException | SecondException ex) {
logger.error(ex);
throw ex;
}

5. others(include binary literals, underscore in literals, improved Compile Warnings and Errors)