Question

I am working on existing code to enhance the functionality.

In existing code I saw there are multiple constructors with string parameters. like

public class A {
    public A(String a){
    }

    public A(String a, String b){
    }

    public A(String a, String b, String c){
    }
}

While enhancement i found that i need to add another string parameter to the constructor.
However this seems to be problem, there could be another enhancement in that i have to add anther string.

I want to avoid such scenario.

What could be the best design to avoid such scenario?

Is good solution is to use HashMap?

Answer 1

Is good solution is to use HashMap?

It’s not really clear what problem you’re trying to solve, but you might want to consider encapsulating the parameters in another class – perhaps one which is mutable, following the builder pattern. That would leave you with something like:

FooParams params = new FooParams().withA("a value")
                                  .withB("b value")
                                  .withC("c value");
Foo foo = new Foo(params);

(You could even have a buildFoo() method in FooParams to keep the whole thing fluent.)