Provides core classes of the Android environment.
| Appendable | Declares methods to append characters or character sequences. |
| CharSequence | This interface represents an ordered set of characters and defines the methods to probe them. |
| Cloneable | This (empty) interface must be implemented by all classes that wish to support cloning. |
| Comparable<T> | This interface should be implemented by all classes that wish to define a natural order of their instances. |
| Iterable<T> | Instances of classes that implement this interface can be used with the enhanced for loop. |
| Readable | Represents a sequence of characters that can be incrementally read (copied)
into a CharBuffer. |
| Runnable | Represents a command that can be executed. |
| Thread.UncaughtExceptionHandler | Implemented by objects that want to handle cases where a thread is being terminated by an uncaught exception. |
| Boolean | The wrapper for the primitive type boolean. |
| Byte | The wrapper for the primitive type byte. |
| Character | The wrapper for the primitive type char. |
| Character.Subset | |
| Character.UnicodeBlock | Represents a block of Unicode characters, as defined by the Unicode 4.0.1 specification. |
| Class<T> | The in-memory representation of a Java class. |
| ClassLoader | Loads classes and resources from a repository. |
| Compiler | Placeholder class for environments which explicitly manage the action of a Just In Time (JIT) compiler. |
| Double | The wrapper for the primitive type double. |
| Enum<E extends Enum<E>> | The superclass of all enumerated types. |
| Float | The wrapper for the primitive type float. |
| InheritableThreadLocal<T> | A thread-local variable whose value is passed from parent to child thread. |
| Integer | The wrapper for the primitive type int. |
| Long | The wrapper for the primitive type long. |
| Math | Class Math provides basic math constants and operations such as trigonometric functions, hyperbolic functions, exponential, logarithms, etc. |
| Number | The abstract superclass of the classes which represent numeric base types
(that is Byte, Short, Integer, Long,
Float, and Double. |
| Object | The root class of the Java class hierarchy. |
| Package | Contains information about a Java package. |
| Process | Represents an external process. |
| ProcessBuilder | Creates operating system processes. |
| Runtime | Allows Java applications to interface with the environment in which they are running. |
| RuntimePermission | Represents the permission to execute a runtime-related function. |
| SecurityManager | Warning: security managers do not provide a secure environment for executing untrusted code. |
| Short | The wrapper for the primitive type short. |
| StackTraceElement | A representation of a single stack frame. |
| StrictMath | Class StrictMath provides basic math constants and operations such as trigonometric functions, hyperbolic functions, exponential, logarithms, etc. |
| String | An immutable sequence of characters/code units (chars). |
| StringBuffer | A modifiable sequence of characters for use in creating
strings, where all accesses are synchronized. |
| StringBuilder | A modifiable sequence of characters for use in creating
strings. |
| System | Provides access to system-related information and resources including standard input and output. |
| Thread | A Thread is a concurrent unit of execution. |
| ThreadGroup | A ThreadGroup is a means of organizing Threads into a
hierarchical structure. |
| ThreadLocal<T> | Implements a thread-local storage, that is, a variable for which each thread has its own value. |
| Throwable | The superclass of all classes which can be thrown by the virtual machine. |
| Void | Placeholder class for the Java keyword void. |
| Thread.State | A representation of a thread's state. |
| ArithmeticException | Thrown when the an invalid arithmetic operation is attempted. |
| ArrayIndexOutOfBoundsException | Thrown when the an array is indexed with a value less than zero, or greater than or equal to the size of the array. |
| ArrayStoreException | Thrown when a program attempts to store an element of an incompatible type in an array. |
| ClassCastException | Thrown when a program attempts to cast a an object to a type with which it is not compatible. |
| ClassNotFoundException | Thrown when a class loader is unable to find a class. |
| CloneNotSupportedException | Thrown when a program attempts to clone an object which does not support the
Cloneable interface. |
| EnumConstantNotPresentException | Thrown if an enum constant does not exist for a particular name. |
| Exception | Exception is the superclass of all classes that represent recoverable
exceptions. |
| IllegalAccessException | Thrown when a program attempts to access a field or method which is not accessible from the location where the reference is made. |
| IllegalArgumentException | Thrown when a method is invoked with an argument which it can not reasonably deal with. |
| IllegalMonitorStateException | Thrown when a monitor operation is attempted when the monitor is not in the correct state, for example when a thread attempts to exit a monitor which it does not own. |
| IllegalStateException | Thrown when an action is attempted at a time when the virtual machine is not in the correct state. |
| IllegalThreadStateException | Thrown when an operation is attempted which is not possible given the state that the executing thread is in. |
| IndexOutOfBoundsException | Thrown when a program attempts to access a value in an indexable collection using a value which is outside of the range of valid indices. |
| InstantiationException | Thrown when a program attempts to access a constructor which is not accessible from the location where the reference is made. |
| InterruptedException | Thrown when a waiting thread is activated before the condition it was waiting for has been satisfied. |
| NegativeArraySizeException | Thrown when an attempt is made to create an array with a size of less than zero. |
| NoSuchFieldException | Thrown when the virtual machine notices that a program tries to reference, on a class or object, a field that does not exist. |
| NoSuchMethodException | Thrown when the virtual machine notices that a program tries to reference, on a class or object, a method that does not exist. |
| NullPointerException | Thrown when a program tries to access a field or method of an object or an
element of an array when there is no instance or array to use, that is if the
object or array points to null. |
| NumberFormatException | Thrown when an invalid value is passed to a string-to-number conversion method. |
| RuntimeException | RuntimeException is the superclass of all classes that represent
exceptional conditions which occur as a result of executing an application in
the virtual machine. |
| SecurityException | Thrown when a security manager check fails. |
| StringIndexOutOfBoundsException | Thrown when the a string is indexed with a value less than zero, or greater than or equal to the size of the array. |
| TypeNotPresentException | Thrown when a program tries to access a class, interface, enum or annotation type through a string that contains the type's name and the type cannot be found. |
| UnsupportedOperationException | Thrown when an unsupported operation is attempted. |
| AbstractMethodError | Thrown by the virtual machine when an abstract method is called. |
| AssertionError | Thrown when an assertion has failed. |
| ClassCircularityError | Thrown when the virtual machine notices that an attempt is made to load a class which would directly or indirectly inherit from one of its subclasses. |
| ClassFormatError | Thrown by a class loader when a class file has an illegal format or if the data that it contains can not be interpreted as a class. |
| Error | Error is the superclass of all classes that represent unrecoverable
errors. |
| ExceptionInInitializerError | Thrown when an exception occurs during class initialization. |
| IllegalAccessError | Thrown when the virtual machine notices that a program tries access a field which is not accessible from where it is referenced. |
| IncompatibleClassChangeError | IncompatibleClassChangeError is the superclass of all classes which
represent errors that occur when inconsistent class files are loaded into
the same running image. |
| InstantiationError | Thrown when the virtual machine notices that a program tries to create a new
instance of a class which has no visible constructors from the location where
new is invoked. |
| InternalError | Thrown when the virtual machine notices that it has gotten into an undefined state. |
| LinkageError | LinkageError is the superclass of all error classes that occur when
loading and linking class files. |
| NoClassDefFoundError | Thrown when the virtual machine is unable to locate a class which it has been asked to load. |
| NoSuchFieldError | Thrown when the virtual machine notices that a program tries to reference, on a class or object, a field that does not exist. |
| NoSuchMethodError | Thrown when the virtual machine notices that a program tries to reference, on a class or object, a method that does not exist. |
| OutOfMemoryError | Thrown when a request for memory is made that can not be satisfied using the available platform resources. |
| StackOverflowError | Thrown when the depth of the callstack of the running program excedes some platform or virtual machine specific limit. |
| ThreadDeath | ThreadDeath is thrown when a thread stops executing. |
| UnknownError | Thrown when the virtual machine must throw an error which does not match any known exceptional condition. |
| UnsatisfiedLinkError | Thrown when an attempt is made to invoke a native for which an implementation could not be found. |
| UnsupportedClassVersionError | Thrown when an attempt is made to load a class with a format version that is not supported by the virtual machine. |
| VerifyError | Thrown when the virtual machine notices that an attempt is made to load a class which does not pass the class verification phase. |
| VirtualMachineError | VirtualMachineError is the superclass of all error classes that occur
during the operation of the virtual machine. |
