How to convert a String which looks like an Array into an actual Object Array?

Question

Since

public static String requestMethodExecution(String objectName, String className, String methodName, Object...
            params) {
        return String.format("%s,%s,%s,%s", objectName, className, methodName, Arrays.toString(params));
    }

returns a String, and if you would, for example, call the method like this:

requestMethodExecution("foo","bar","fooBar",2.0,3.0,"Hello");

You'd get a String like this: foo,bar,fooBar,[2.0,3.0,Hello]

I would love to iterate over that Array, but I can't since it is a String.

Reason behind this is this method: (I just started with reflection, so I do not know how else to do it)

 public static Class[] getParameterType(String ...params) throws ClassNotFoundException {
            Class[] paramTypes = new Class[params.length];
            for(int i=0; i<params.length;i++){
                Class paramClass = Class.forName(params[i]);
                if (paramClass == Double.class) {
                    paramTypes[i] = (double.class);
                } else if (paramClass == Integer.class) {
                    paramTypes[i] = (int.class);
                } else {
                    paramTypes[i] = paramClass;
                }
            }
            return paramTypes;
    }

So far I have only come up with a very dirty way:

 public static String[] getParams(String message){
    int indexOfParamStart = message.indexOf("[");
    int indexOfParamEnd = message.indexOf("]")+1;
    String[] splitMessage = message.substring(indexOfParamStart, indexOfParamEnd).replaceAll("\\[", "")
            .replaceAll("]", "").replaceAll(" ","").split(",");
    return splitMessage;
}

Edit: Thanks for looking into this! Since some of you are asking what I am trying to achieve, here is a bit more explanation:

I want to implement a simple request/reply protocol which allows remote method invocation (and I do not want to use java RMI...) So I listen for requests whose structure can be seen at the requestMethodExecution example.

There I have all the relevant information to call the Method upon my class, so to invoke the method I need it's arguments (and their value) and I do not know how to access them from the given String.

The others are easy with Class c = Class.forName(className); etc..

Edit#2: My question is not about a simple regex, so why close it? The title already states a different subject, I am getting a bit salty here...

Answer 1

See this this question for using RegEx to extract the array body from the outer string (by the square brackets), and then you can simply use String.split(",") to split the array body into array items.