Test.java

public class Test {
	
	private static class A{
		public static void test(){
			System.out.println("A:test");
		}
		
		void dynamic(){
			System.out.println("A:dynamic");
		}
	}
	
	private static class B extends A{
		public static void test(){
			System.out.println("B:test");
		}
		
		@Override
		void dynamic(){
			System.out.println("B:dynamic");
		}
	}
	
	public static void main(String[] args) {
		A.test(); // A:test
		B.test(); // B:test
		//A.dynamic() - doesnt work, requires object to run
		//B.dynamic() - doesnt work, requires object to run
		
		A aa = new A();
		aa.test(); // A:test
		aa.dynamic(); // A:dynamic
		
		B bb = new B();
		bb.test(); // B:test
		bb.dynamic(); // B:dynamic
		
		A ab = new B(); // works because B is a subclass of A
		ab.test(); // A:test
		ab.dynamic(); // B:dynamic
		
		/*
	        	Reason: ab.test is static, so which one gets called depends on the reference, not the actual object. Static functions dont know anything about objects.
	        	ab.dynamic is not static, so which one gets called depends on the object type.
		*/
	}

}