Quick-reference table of Java access modifiers

The table on this page lists the differences between public, protected, package-protected — AKA no modifier — and private fields in Java:

Modifier	Class	Package	Subclass	World
public	Y	Y	Y	Y
protected	Y	Y	Y	N
[no modifier]	Y	Y	N	N
private	Y	N	N	N

Source: http://java.sun.com/docs/books/tutorial/java/javaOO/accesscontrol.html

Terms for easy searching later:
package-private, package-protected, access control, public, protected, private