Tuesday, 28 February 2017

Java Tutorial: Properties class in java [How to get the keys using propertyNames method]


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db.properties
Java Tutorial: Properties class in java [How to get the keys using propertyNames method] 
PropertiesDemo.java
import java.io.FileReader;
import java.io.IOException;
import java.util.Enumeration;
import java.util.Properties;

/*
 * public Enumeration<?> propertyNames()
 *  
 * Returns: 
 * --------
 * 
 * an enumeration of all the keys in this property list,
 * including the keys in the default property list.
 */

class PropertiesDemo
{

    public static void main(String[] args) throws IOException
    {
        FileReader fileReader = null;
        try
        {
            fileReader = new FileReader("db.properties");

            Properties p = new Properties();
            /*
             * Reads a property list (key and element pairs)
             * from the input character stream in a simple
             * line-oriented format.
             */
            p.load(fileReader);

            /*
             * Returns an enumeration of all the keys in
             * this property list, including distinct keys
             * in the default property list if a key of the
             * same name has not already been found from the
             * main properties list.
             */
            Enumeration<?> enumeration = p.propertyNames();

            while (enumeration.hasMoreElements())
            {
                String key = (String) enumeration.nextElement();
                String value = p.getProperty(key);

                System.out.println("Key = " + key + " , Value = " + value);
            }

        }
        finally
        {
            if (fileReader != null)
            {
                fileReader.close();
            }
        }
    }
}
Output
Key = user , Value = root 
Key = password , Value = oracle 

Click the below link to download the code:
https://sites.google.com/site/ramj2eev1/home/javabasics/PropertiesDemo_propertyNames_App.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/PropertiesDemo_propertyNames_App

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/fecc858ed896ce9bbf3cb92f5d438fc2de9eee22/BasicJava/PropertiesDemo_propertyNames_App/?at=master

See also:
  • All JavaEE Viedos Playlist
  • All JavaEE Viedos
  • All JAVA EE Links
  • Servlets Tutorial
  • All Design Patterns Links
  • JDBC Tutorial
  • Java Collection Framework Tutorial
  • JAVA Tutorial
  • Kids Tutorial
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