static void insert ( int x , int y ) {
  adjacency . get ( x ) . add ( y ) ;
}

static void insert ( int x , int y ) { adjacency . get ( x ) . add ( y ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier)) (formal_parameter type: (integral_type) name: (identifier))) body: (block (expression_statement (method_invocation object: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) name: (identifier) arguments: (argument_list (identifier))))))