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

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db.properties

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

PropertiesDemo.java

import java.io.FileReader;
import java.io.IOException;
import java.util.Iterator;
import java.util.Properties;
import java.util.Set;

/*
 * public Set<String> stringPropertyNames()
 * 
 * Returns: 
 * --------
 * 
 * a set of keys in this property list where the key and
 * its corresponding value are strings, 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 a set of keys in this property list
             * where the key and its corresponding value are
             * strings, 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.
             */
            Set<String> set = p.stringPropertyNames();

            Iterator<String> itr = set.iterator();

            while (itr.hasNext())
            {
                String key = (String) itr.next();
                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 

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