Understanding the 'native' Keyword in Java

The native keyword in Java signifies that a particular method is implemented in another programming language like C or C++. This keyword allows Java to integrate with code written in other languages, effectively leveraging the power and efficiency of native code. The use of native methods opens up a vast array of capabilities, including low-level system calls, library usage, and platform-specific features that would otherwise be beyond the reach of Java.

An excellent example of utilizing the native method is when you notice a method in an object-oriented design that cannot be implemented directly in Java. For instance, you might require access to system-level resources that exist outside the Java virtual machine (JVM). This is where the native keyword comes in.

Consider the following sample code for illustration:

class NativeDemo {
  public native void test(); // Native method declaration

  static {
    System.loadLibrary("NativeDemo"); 
    // Load DLL that contains static method
  }

  public static void main(String[] args) {
    NativeDemo obj = new NativeDemo();
    obj.test(); // Invoke native method
  }
}

In the example above, we declare a native method test(). The System.loadLibrary("NativeDemo") command is used to load a dynamic link library (DLL) that incorporates the implementation of this native method. Note that the 'NativeDemo' should be the name of your DLL file.

Best practices while using the 'native' keyword involve cautious handling. While the use of native methods can be highly beneficial, it is also loaded with potential pitfalls.

For instance, a poorly written native method might cause memory leaks or crashes, which can be difficult to debug. Moreover, native code is inherently platform-specific, which undermines Java's famed platform independence. Therefore, it's recommended to use this feature judiciously and only when necessary.

Remember to always document your code when mixing Java with native libraries as it could become challenging to manage and debug. Furthermore, consider safety and security practices associated with the specific language you are using for the native implementation.

In conclusion, the 'native' keyword in Java offers an effective solution to implement more complex functions not supported directly in Java, thus extending its capabilities. However, it should be exercised with caution to prevent potential pitfalls associated with cross-language programming.