Http http = new Http();
String baseUrl = URL.getSalesforceBaseUrl().toExternalForm();
String path = '/services/data/v43.0/tooling/query/?q=';
String query = 'Select Id,Name,SymbolTable,Body from ApexClass WHERE Id=\'01p6F000009v2TfQAI\'';
List<sObject> sobjList = Database.query(query);
System.debug('Query'+query);
HttpRequest request = new HttpRequest();
request.setEndpoint(baseUrl+path+query);
request.setMethod('GET');
HttpResponse response = http.send(request);
// If the request is successful, parse the JSON response.
if (response.getStatusCode() == 200) {
    // Deserialize the JSON string into collections of primitive data types.
    Map<String, Object> results = (Map<String, Object>) JSON.deserializeUntyped(response.getBody());
    // Cast the values in the 'animals' key as a list
    //List<Object> animals = (List<Object>) results.get('animals');
    System.debug('Received the following animals:');
    //List<sObject> methods = results[0].symbolTable.methods;
// now you have all methods with their name and parameters
List<Object> Methods = (List<Object>) results.get('Methods');

    for(Object method : methods)
{
    System.debug('Method Id:');
}
}
else
{
String baseUrl = URL.getSalesforceBaseUrl().toExternalForm();
System.debug('BaseUrl'+baseUrl);
}