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A default method is an interface method that adds new functionality and at the same time is backward compatible.

This is achieved with a default implementation, that doesn't break previous implementations of the interface. By defaut all the methods of an interface are abstract, however this is not the case of a default method.

	public interface Runnable {

		void run();
		default int getThreadId() { // implementation }
	}

You can extend an interface with a default method and:

• Inherit the method
• Override the methdod
• Override the method and make it abstract

Static methods are similar to default methods, but they are static and cannot be overridden.

	public interface Runnable {

		void run();
		static int getNumThreads() { // implementation }
	}