Question

I researched this around and still can’t seem to solve this problem. I have the following in my program:

   public void InsertDB(double price, double shares, String ticker, int id)throws Exception {
   //do some stuff
   }

I tried the following within my main class(and got the above error non-static method cannot be referenced in static context):

InsertDB(constants[i], variables[i], ticker[i], count);

Then I read you must create a new instance so I tried(Testingground is the name of my program) and I get an error saying it cannot find the InsertDB symbol:

Testingground myObject = new InsertDB();

I’m new to java and kind of inherited this program(I haven’t had this problem with my programs), can someone tell me what I can do to get this to work and the logic behind it?(my insertdb class gives me errors if I turn it to static so that approach won’t work). I also read that it might work if I changed public to protected but it still didn’t work.

Thanks in advance

Answer 1

You need to instantiate the class itself, not the method InsertDB(). You instantiate a class by using the key word new. You can refer to the official tutorial on the oracle/sun docs.

Example:

Testingground myObject = new Testingground();
myObject.InsertDB(constants[i], variables[i], ticker[i], count);

Methods can also be declared as static. In that case you can reference them directly ie. Testingground.InsertDB(constants[i], variables[i], ticker[i], count); without constructing an object for that class.

Also by convention method names are camel cased. Read more about naming conventions in java here.