java.lang
Interfaces 
Comparable
Runnable
Classes 
Boolean
Byte
Character
Class
Double
Float
Integer
Long
Math
Number
Object
Runtime
Short
String
StringBuffer
StringBuilder
System
Thread
ThreadGroup
Throwable
Void
Exceptions 
ArithmeticException
ArrayIndexOutOfBoundsException
ArrayStoreException
ClassCastException
ClassNotFoundException
Exception
IllegalAccessException
IllegalArgumentException
IllegalMonitorStateException
IllegalStateException
IllegalThreadStateException
IndexOutOfBoundsException
InstantiationException
InterruptedException
NegativeArraySizeException
NullPointerException
NumberFormatException
RuntimeException
SecurityException
StringIndexOutOfBoundsException
UnsupportedOperationException
Errors 
AbstractMethodError
Error
ExceptionInInitializerError
IllegalAccessError
IncompatibleClassChangeError
InternalError
LinkageError
NoClassDefFoundError
NoSuchMethodError
OutOfMemoryError
StackOverflowError
ThreadDeath
UnsatisfiedLinkError
VerifyError
VirtualMachineError