All class in java.lang package

All class below is from java.lang package. If you want to use one of the class in the list, you don't need to import it into your program like other class, for example class JFrame from javax.swing package that need import statement in your program ( import javax.swing.JFrame ). This is because it will import implicitly into your program by compiler.

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Interfaces
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Appendable
CharSequence
Cloneable
Comparable
Iterable
Readable
Runnable
Thread.UncaughtExceptionHandler

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Classes
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Boolean
Byte
Character
Character.Subset
Character.UnicodeBlock
Class
ClassLoader
Compiler
Double
Enum
Float
InheritableThreadLocal
Integer
Long
Math
Number
Object
Package
Process
ProcessBuilder
Runtime
RuntimePermission
SecurityManager
Short
StackTraceElement
StrictMath
String
StringBuffer
StringBuilder
System
Thread
ThreadGroup
ThreadLocal
Throwable
Void

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Enums
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Thread.State

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Exceptions
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ArithmeticException
ArrayIndexOutOfBoundsException
ArrayStoreException
ClassCastException
ClassNotFoundException
CloneNotSupportedException
EnumConstantNotPresentException
Exception
IllegalAccessException
IllegalArgumentException
IllegalMonitorStateException
IllegalStateException
IllegalThreadStateException
IndexOutOfBoundsException
InstantiationException
InterruptedException
NegativeArraySizeException
NoSuchFieldException
NoSuchMethodException
NullPointerException
NumberFormatException
RuntimeException
SecurityException
StringIndexOutOfBoundsException
TypeNotPresentException
UnsupportedOperationException

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Errors
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AbstractMethodError
AssertionError
ClassCircularityError
ClassFormatError
Error
ExceptionInInitializerError
IllegalAccessError
IncompatibleClassChangeError
InstantiationError
InternalError
LinkageError
NoClassDefFoundError
NoSuchFieldError
NoSuchMethodError
OutOfMemoryError
StackOverflowError
ThreadDeath
UnknownError
UnsatisfiedLinkError
UnsupportedClassVersionError
VerifyError
VirtualMachineError

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Annotation Types
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Deprecated
Override
SuppressWarnings