Javac语法糖之TryCatchFinally

Posted 2020-10-03

 

Optionally replace a try statement with the desugaring of a try-with-resources statement.  The canonical desugaring of

 try ResourceSpecification
   Block

 is

 {
   final VariableModifiers_minus_final R #resource = Expression;
   Throwable #primaryException = null;

   try ResourceSpecificationtail
     Block
   catch (Throwable #t) {
     #primaryException = t;
     throw #t;
   } finally {
     if (#resource != null) {
       if (#primaryException != null) {
         try {
           #resource.close();
         } catch(Throwable #suppressedException) {
           #primaryException.addSuppressed(#suppressedException);
         }
       } else {
         #resource.close();
       }
     }
   }