java.lang
Interfaces 
Cloneable
Runnable
Classes 
Boolean
Character
Class
Double
Float
Integer
Long
Math
Object
String
StringBuffer
StringBuilder
System
Thread
Throwable
Exceptions 
ArithmeticException
ArrayIndexOutOfBoundsException
ArrayStoreException
ClassCastException
CloneNotSupportedException
Exception
IllegalArgumentException
IllegalMonitorStateException
IllegalThreadStateException
IndexOutOfBoundsException
InterruptedException
NegativeArraySizeException
NoSuchMethodException
NullPointerException
RuntimeException
UnsupportedOperationException
Errors 
Error
InternalError
LinkageError
OutOfMemoryError
StackOverflowError
UnknownError
UnsatisfiedLinkError
VirtualMachineError