public static void main ( String [ ] args ) {
  char a [ ] [ ] = {
    {
      '.' , '_' }, {
        '_' , '.' }
      };
      Matrix ( a ) ;
    }
    
public static void main ( String [ ] args ) { char a [ ] [ ] = { { ' . ' , ' _ ' } , { ' _ ' , ' . ' } } ; Matrix ( a ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (type_identifier) dimensions: (dimensions)) name: (identifier))) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) dimensions: (dimensions) value: (array_initializer (array_initializer (character_literal) (character_literal)) (array_initializer (character_literal) (character_literal))))) (expression_statement (method_invocation name: (identifier) arguments: (argument_list (identifier))))))