Q) Explain about properties class?

A)

->java.util.Properties is a sub class of java.util.Hashtable.

->object oriented representation of a properties file is nothing but properties object.

->some information is given to servlets or container etc… by using this properties class. The file (secondary memory file) is represented as object oriented representation.

Ex:
database properties

User :scott

Password:tiger

importjava.util.Properties;

importjava.util.Properties;

import java.io.*;

class propertiestest {

       public static void main(String[] args) throws Exception{

              FileInputStream fis = new FileInputStream ("database.properties");

              Properties p = new Properties();

              p.load(fis);

              System.out.println(p.getProperty("user"));

              System.out.println(p.getProperty("password"));

              p.setProperty("mail",  "username.@gmail.com");

              FileOutputStream fos = new FileOutputStream("database.property");

              p.store(fos, "some database some personal");

              fos.close();

              fis.close();

       }

}