[JAVA] Eccezione "ClassCastException" e suo significato

[nikynik]

sapreste dirmi cosa significano queste eccezioni
mi da errori in questo modo:
Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: javax.swing.table.DefaultTableCellRenderer

[floyd]

Thrown to indicate that the code has attempted to cast an object to a subclass of which it is not an instance. For example, the following code generates a ClassCastException:

Object x = new Integer(0);
System.out.println((String)x);

http://java.sun.com/j2se/1.5.0/docs/api/