Java Programming

http://www.google.com/search?q=dynamic+polymorphism+java

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Isn't this the time of year when we do the googling for posters too lazy to do their own homework? I guess not ;-)

http://groovy.codehaus.org/

;o)

Merry Christmas, Dr. L.

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New Year's resolution: Be groovy in the new year!

groovy.util.GString --- tee-hee

"Dynamic polymorphism" is a phrase that was made up by someone who had no clue what they were talking about. If you want useful information, just look up "polymorphism".

I much prefer static polymorphism myself.

there are two polymorphism, which are static and dynamic.
as you know, static polymorphism is done by compiler, but dynamic polymorphism is done by run-time.
Thus, the below can explain it. the compiler cannot decide what the "Object o" will be, so it will be done during run time.

public class B implements C{

	public void doSomething() {
		System.out.println("i am B");
		
	}
	
}

public interface C {
	public void doSomething();

}

public class A implements C{
	
	static ArrayList<C> al = new ArrayList();
	/**
	 * @param args
	 */
	public static void main(String[] args) {

		Random r = new Random();
		if(r.nextInt()%2 == 0){
			al.add(new B());
		}else{
			al.add(new A());			
		}
		
		
		C o = al.get(al.size()-1);
		o.doSomething();
		

	}
	public void doSomething() {
		System.out.println("hello A");
		
	}


}