How to use Java property files?

Question

I have a list of key/value pairs of configuration values I want to store as Java property files, and later load and iterate through.

Questions:

• Do I need to store the file in the same package as the class which will load them, or is there any specific location where it should be placed?
• Does the file need to end in any specific extension or is .txt OK?
• How can I load the file in the code
• And how can I iterate through the values inside?

Answer 1

Here is another way to iterate over the properties:

Enumeration eProps = properties.propertyNames();
while (eProps.hasMoreElements()) { 
    String key = (String) eProps.nextElement(); 
    String value = properties.getProperty(key); 
    System.out.println(key + " => " + value); 
}

Answer 2

Example:

Properties pro = new Properties();
FileInputStream in = new FileInputStream("D:/prop/prop.properties");
pro.load(in);
String temp1[];
String temp2[];
// getting values from property file
String username = pro.getProperty("usernamev3");//key value in prop file 
String password = pro.getProperty("passwordv3");//eg. username="zub"
String delimiter = ",";                         //password="abc"
temp1=username.split(delimiter);
temp2=password.split(delimiter);