Function override-overload in Java

Question

What is the difference between override and overload?

Answer 1

On interesting thing to mention:

public static doSomething(Collection c) {
    // do something
}

public static doSomething(ArrayList l) {
    // do something
}

public static void main(String[] args) {
    Collection c = new ArrayList ();
    doSomething(c); // which method get's called?
}

One would suppose the method with the ArrayList argument would be called but it doesn't. The first method is called since the proper method is selected at compile time.