java.lang
Interfaces 
Cloneable
Classes 
Class
Float
Integer
Math
Object
Runtime
String
StringBuffer
System
Thread
Throwable
Exceptions 
ArithmeticException
ArrayIndexOutOfBoundsException
ClassCastException
ClassNotFoundException
Exception
IllegalArgumentException
IllegalMonitorStateException
IllegalStateException
InterruptedException
NullPointerException
NumberFormatException
RuntimeException
StringIndexOutOfBoundsException
Errors 
Error
NoClassDefFoundError
NoSuchMethodError
OutOfMemoryError
StackOverflowError
ThreadDeath