Overriding and Overloading, Overloading, Overriding

Methods can be overridden or overloaded; constructors can be overloaded but not overridden.
Abstract methods must be overridden by the first concrete (nonabstract) subclass.
With respect to the method it overrides, the overriding method
Must have the same argument list
Must have the same return type, except that as of Java 5, the return type can be a subclass—this is known as a covariant return.
Must not have a more restrictive access modifier
May have a less restrictive access modifier
Must not throw new or broader checked exceptions
May throw fewer or narrower checked exceptions, or any unchecked exception.
final methods cannot be overridden.
Only inherited methods may be overridden, and remember that private methods are not inherited.
A subclass uses super.overriddenMethodName() to call the superclass version of an overridden method.

Overloading means reusing amethod name, but with different arguments.
Overloaded methods
Must have different argument lists
May have different return types, if argument lists are also different
May have different access modifiers
May throw different exceptions
Methods from a superclass can be overloaded in a subclass.
Polymorphism applies to overriding, not to overloading
Object type (not the reference variable's type), determines which overridden method is used at runtime.
Reference type determines which overloaded method will be used at compile time.