@NonNullByDefault(value=true)
| Interface | Description | 
|---|---|
| Appendable | 
 An object to which char sequences and values can be appended. 
 | 
| AutoCloseable | 
 A resource that must be closed when it is no longer needed. 
 | 
| CharSequence | |
| Cloneable | 
 A class implements the  
Cloneable interface to indicate to the
 Object.clone() method that it is legal for that method to make a
 field-for-field copy of instances of that class. | 
| Comparable<T> | |
| Iterable<T> | 
 Implementing this interface allows an object to be the target of the "foreach" statement. 
 | 
| Readable | 
 This interface is only defined for hierarchy compatibility. 
 | 
| Runnable | 
 The  
Runnable interface should be implemented by any class whose instances are
 intended to be executed by a thread. | 
| Thread.UncaughtExceptionHandler | 
 Interface for handlers invoked when a Thread abruptly terminates due to an uncaught
 exception. 
 | 
| Class | Description | 
|---|---|
| Boolean | 
 The Boolean class wraps a value of the primitive type  
boolean in an object. | 
| Byte | 
 The  
Byte class wraps a value of primitive type byte in an object. | 
| Character | 
 The  
Character class wraps a value of the primitive type char in an object. | 
| Class<T> | 
 Instances of the class  
Class represent classes and interfaces in a running Java
 application. | 
| Double | 
 The  
Double class wraps a value of the primitive type double in an object. | 
| Enum<E extends Enum<E>> | 
 This is the common base class of all Java language enumeration types. 
 | 
| Float | 
 The  
Float class wraps a value of primitive type float in an object. | 
| Integer | 
 The  
Integer class wraps a value of the primitive type int in an object. | 
| Long | 
 The  
Long class wraps a value of the primitive type long in an object. | 
| Math | |
| Number | 
 The abstract class  
Number is the superclass of classes BigDecimal,
 BigInteger, Byte, Double, Float,
 Integer, Long, and Short. | 
| Object | 
 Class  
Object is the root of the class hierarchy. | 
| Package | 
Package represent a Java package. | 
| Runtime | 
 Every Java application has a single instance of class  
Runtime that allows the
 application to interface with the environment in which the application is running. | 
| RuntimePermission | |
| SecurityManager | 
 The security manager is a class that allows applications to implement a security policy. 
 | 
| Short | 
 The  
Short class wraps a value of primitive type short in an object. | 
| StackTraceElement | 
 An element in a stack trace. 
 | 
| String | |
| StringBuffer | 
 A thread-safe, mutable sequence of characters. 
 | 
| StringBuilder | 
 A mutable sequence of characters. 
 | 
| System | 
 The  
System class contains several useful class fields and methods. | 
| Thread | 
 A thread is a thread of execution in a program. 
 | 
| Throwable | 
 The  
Throwable class is the superclass of all errors and exceptions in the Java language. | 
| Enum | Description | 
|---|---|
| Thread.State | 
 A thread state. 
 | 
| Exception | Description | 
|---|---|
| ArithmeticException | 
 Thrown when an exceptional arithmetic condition has occurred. 
 | 
| ArrayIndexOutOfBoundsException | 
 Thrown to indicate that an array has been accessed with an illegal index. 
 | 
| ArrayStoreException | 
 Thrown to indicate that an attempt has been made to store the wrong type of object into an array
 of objects. 
 | 
| ClassCastException | 
 Thrown to indicate that the code has attempted to cast an object to a subclass of which it is not
 an instance. 
 | 
| ClassNotFoundException | 
 Thrown when an application tries to load in a class through its string name using:
 
 The  
forName method in class Class. | 
| CloneNotSupportedException | |
| Exception | 
 The class  
Exception and its subclasses are a form of Throwable that indicates
 conditions that a reasonable application might want to catch. | 
| IllegalAccessException | 
 An IllegalAccessException is thrown when an application tries to reflectively create an instance
 (other than an array), set or get a field, or invoke a method, but the currently executing method
 does not have access to the definition of the specified class, field, method or constructor. 
 | 
| IllegalArgumentException | 
 Thrown to indicate that a method has been passed an illegal or inappropriate argument. 
 | 
| IllegalMonitorStateException | 
 Thrown to indicate that a thread has attempted to wait on an object's monitor or to notify other
 threads waiting on an object's monitor without owning the specified monitor. 
 | 
| IllegalStateException | 
 Signals that a method has been invoked at an illegal or inappropriate time. 
 | 
| IllegalThreadStateException | 
 Thrown to indicate that a thread is not in an appropriate state for the requested operation. 
 | 
| IndexOutOfBoundsException | 
 Thrown to indicate that an index of some sort (such as to an array, to a string, or to a vector)
 is out of range. 
 | 
| InstantiationException | 
 Thrown when an application tries to create an instance of a class using the  
newInstance
 method in class Class, but the specified class object cannot be instantiated. | 
| InterruptedException | 
 Thrown when a thread is waiting, sleeping, or otherwise occupied, and the thread is interrupted,
 either before or during the activity. 
 | 
| NegativeArraySizeException | 
 Thrown if an application tries to create an array with negative size. 
 | 
| NoSuchFieldException | 
 Signals that the class doesn't have a field of a specified name. 
 | 
| NoSuchMethodException | 
 Thrown when a particular method cannot be found. 
 | 
| NullPointerException | 
 Thrown when an application attempts to use  
null in a case where an object is required. | 
| NumberFormatException | 
 Thrown to indicate that the application has attempted to convert a string to one of the numeric
 types, but that the string does not have the appropriate format. 
 | 
| ReflectiveOperationException | 
 Common superclass of exceptions thrown by reflective operations in core reflection. 
 | 
| RuntimeException | 
RuntimeException is the superclass of those exceptions that can be thrown during the
 normal operation of the Java Virtual Machine. | 
| SecurityException | 
 Thrown by the security manager to indicate a security violation. 
 | 
| StringIndexOutOfBoundsException | 
 Thrown by  
String methods to indicate that an index is either negative or greater
 than the size of the string. | 
| UnsupportedOperationException | 
 Thrown to indicate that the requested operation is not supported. 
 | 
| Error | Description | 
|---|---|
| AbstractMethodError | 
 Thrown when an application tries to call an abstract method. 
 | 
| AssertionError | 
 Thrown to indicate that an assertion has failed. 
 | 
| ClassCircularityError | 
 Thrown when the Java Virtual Machine detects a circularity in the superclass hierarchy of a class
 being loaded. 
 | 
| ClassFormatError | 
 Thrown when the Java Virtual Machine attempts to read a class file and determines that the file
 is malformed or otherwise cannot be interpreted as a class file. 
 | 
| Error | 
 An  
Error is a subclass of Throwable that indicates serious problems that a
 reasonable application should not try to catch. | 
| ExceptionInInitializerError | 
 Signals that an unexpected exception has occurred in a static initializer. 
 | 
| IllegalAccessError | 
 Thrown if an application attempts to access or modify a field, or to call a method that it does
 not have access to. 
 | 
| IncompatibleClassChangeError | 
 Thrown when an incompatible class change has occurred to some class definition. 
 | 
| InstantiationError | 
 Thrown when an application tries to use the Java  
new construct to instantiate an
 abstract class or an interface. | 
| InternalError | 
 Thrown to indicate some unexpected internal error has occurred in the Java Virtual Machine. 
 | 
| LinkageError | 
 Subclasses of  
LinkageError indicate that a class has some dependency on another class;
 however, the latter class has incompatibly changed after the compilation of the former class. | 
| NoClassDefFoundError | 
 Thrown if the Java Virtual Machine or a  
ClassLoader instance tries to load in the
 definition of a class (as part of a normal method call or as part of creating a new instance
 using the new expression) and no definition of the class could be found. | 
| NoSuchFieldError | 
 Thrown if an application tries to access or modify a specified field of an object, and that
 object no longer has that field. 
 | 
| NoSuchMethodError | 
 Thrown if an application tries to call a specified method of a class (either static or instance),
 and that class no longer has a definition of that method. 
 | 
| OutOfMemoryError | 
 Thrown when the Java Virtual Machine cannot allocate an object because it is out of memory, and
 no more memory could be made available by the garbage collector. 
 | 
| StackOverflowError | 
 Thrown when a stack overflow occurs because an application recurses too deeply. 
 | 
| UnknownError | 
 Thrown when an unknown but serious exception has occurred in the Java Virtual Machine. 
 | 
| UnsatisfiedLinkError | 
 Thrown if the Java Virtual Machine cannot find an appropriate native-language definition of a
 method declared  
native. | 
| UnsupportedClassVersionError | 
 Thrown when the Java Virtual Machine attempts to read a class file and determines that the major
 and minor version numbers in the file are not supported. 
 | 
| VerifyError | 
 Thrown when the "verifier" detects that a class file, though well formed, contains some sort of
 internal inconsistency or security problem. 
 | 
| VirtualMachineError | 
 Thrown to indicate that the Java Virtual Machine is broken or has run out of resources necessary
 for it to continue operating. 
 | 
| Annotation Type | Description | 
|---|---|
| Deprecated | 
 A program element annotated @Deprecated is one that programmers are discouraged from using,
 typically because it is dangerous, or because a better alternative exists. 
 | 
| Override | 
 Indicates that a method declaration is intended to override a method declaration in a supertype. 
 | 
| SafeVarargs | 
 A programmer assertion that the body of the annotated method or constructor does not perform
 potentially unsafe operations on its varargs parameter. 
 | 
| SuppressWarnings | 
 Indicates that the named compiler warnings should be suppressed in the annotated element (and in
 all program elements contained in the annotated element). 
 |