using properties : Properties « Collections « Java Tutorial

1. Java Tutorial
2. Collections
3. Properties

import java.io.FileInputStream;
import java.util.Properties;

public class PropView {
  public static void main(String args[]) throws Exception {
    Properties properties = System.getProperties();
    properties.list(System.out);

    FileInputStream in = null;

    in = new FileInputStream(args[0]);
    properties.load(in);

    System.getProperties().list(System.out);
    System.out.println("\nValue of local.animal.defined is "
        + Boolean.getBoolean("local.animal.defined"));
    System.out.println("\nValue of local.animal.legcount is "
        + Integer.getInteger("local.animal.legcount"));
  }

}