How Can I Efficiently Manage Java Property Files?

Java Property File Management

Working with configuration values in Java code often involves storing them in property files. Here's a guide to using Java property files efficiently:

File Location and Extension

Property files can be placed anywhere accessible to the classpath. They do not need to be in the same package as the code that loads them. However, it's recommended to keep the files organized and close to the code that uses them.

As for the file extension, '.txt' is acceptable, but '.properties' is more commonly used and helps identify the file as intended for key/value configuration.

Loading Property Files

To load a property file, create a Properties object and provide an InputStream to its load() method. The InputStream can be obtained from a file path or any source providing access to the file:

Properties properties = new Properties();
try {
  properties.load(new FileInputStream("path/filename"));
} catch (IOException e) {
  // Handle IOException
}

Iterating over Values

To iterate through the key/value pairs in the property file, use the stringPropertyNames() method to obtain an array of property keys. For each key, retrieve the corresponding value using the getProperty() method:

for(String key : properties.stringPropertyNames()) {
  String value = properties.getProperty(key);
  System.out.println(key + " -> " + value);
}

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