java.lang
Interfaces 
Cloneable
Runnable
Classes 
Character
Class
Double
Float
Integer
Long
Object
String
StringBuffer
System
Thread
Throwable
Exceptions 
ArithmeticException
ArrayIndexOutOfBoundsException
ArrayStoreException
ClassCastException
ClassNotFoundException
CloneNotSupportedException
Exception
IllegalArgumentException
IllegalMonitorStateException
IndexOutOfBoundsException
InterruptedException
NegativeArraySizeException
NullPointerException
NumberFormatException
RuntimeException
Errors 
Error
OutOfMemoryError