解析java语法
grammar Java;
// starting point for parsing a java file
compilationUnit
: packageDeclaration? importDeclaration* typeDeclaration* EOF
;
packageDeclaration
: annotation* 'package' qualifiedName ';'
;
importDeclaration
: 'import' 'static'? qualifiedName ('.' '*')? ';'
;
typeDeclaration
: classOrInterfaceModifier* classDeclaration
| classOrInterfaceModifier* enumDeclaration
| classOrInterfaceModifier* interfaceDeclaration
| classOrInterfaceModifier* annotationTypeDeclaration
| ';'
;
.....
