Question

My main function uses set of hard coded parameters as given in the sample code.
Objective: I want a cleaner code instead of hard coding these values inside main.
Question: WIs there a way of defining all these parameters in a separate file like a configuration file and enabling access to main? Anybody who wants to change values will be required to modify only the parameter file. If there is a better way of handling the objective, please suggest so.

    public class Sample {

    public static void main(String[] arg) throws Exception {
    BufferedReader File = new BufferedReader(new FileReader("myfile.txt"));
            // parameter list
            String Parameter_1 = "Value_1";
            String Parameter_2 = "Value_2";
            .......
            //Function code
    }

Answer 1

Have a look at Java properties files; you can easily load (and save) them using the class java.util.Properties.

A properties file is a text file that contains key-value pairs, for example like this:

Parameter_1=Value_1
Parameter_2=Value_2

Loading a properties file is very easy:

Properties props = new Properties();
InputStream in = new FileInputStream("config.properties");
props.load(in);
in.close();

Then you can get the values:

String Parameter_1 = props.get("Parameter_1");