static boolean isBST ( Node root ) {
  int prev = Integer . MIN_VALUE ;
  return isBSTUtil ( root , prev ) ;
}

static boolean isBST ( Node root ) { int prev = Integer . MIN_VALUE ; return isBSTUtil ( root , prev ) ; }
(method_declaration (modifiers) type: (boolean_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (type_identifier) name: (identifier))) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (field_access object: (identifier) field: (identifier)))) (return_statement (method_invocation name: (identifier) arguments: (argument_list (identifier) (identifier))))))