The method Registration(String, String, String, String) is undefined for the type Client

Question

            if (type == "REGISTRATION"){
                String name = json.getString("name");
                String Location = json.getString("loc");


                Client.Registration(username, password, name, Location);  //error
                DatabaseController.registerUser(Pobj, userObj);

            }

Client.java

    public static boolean Registration(String username, String password, String name, String loc){

        clientUsername = username;
        clientPassword = password;
        clientname = name;
        clientlocation  = loc;

}

Registration function is defined here it gives me error like:

method Registration(String, String, String, String) is undefined for the type Client

Answer 1

In java (and many other programming languages), your methods (or functions) have to have a return type . In your case, you declared the return type of your function to be boolean . This however means that this method must return a boolean . In your code, you have no return statement.

To solve the problem: you could either add a return statement, or change the return type to void , meaning it doesn't return anything.

Considering that you aren't returning anything in your function, I suggest using the second option, as follows:

public static void Registration(String username, String password, String name, String loc) 
{ ... }

---

Also, as @Peadar Ó Duinnín mentioned, Java methods should be written in camel case, meaning the first word is not capitalized, but all the words after are, ie myFunctionThatDoesSomething() . This means your method should become registration(...)

Answer 2

Your Registration method (which should be registration . Method/Functions are camelCase in Java.) should be in your Client class as follows. You should also be returning a boolean or change the method signature to public static void registration(...

public class Client {
    public static boolean registration(String username, String password, String name, String loc) {
        clientUsername = username;
        clientPassword = password;
        clientName = name;
        clientLocation  = loc;
    }
}