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See:
Description
| Interface Summary | |
| Runnable | The Runnable interface should be implemented by any
class whose instances are intended to be executed by a thread. |
| Class Summary | |
| Boolean | The Boolean class wraps a value of the primitive type
boolean in an object. |
| Byte | The Byte class is the standard wrapper for byte values. |
| Character | The Character class wraps a value of the primitive type char
in an object. |
| Class | Instances of the class Class represent classes and interfaces
in a running Java application. |
| 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 | The class Math contains methods for performing basic
numeric operations. |
| Object | Class Object is the root of the class hierarchy. |
| 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. |
| Short | The Short class is the standard wrapper for short values. |
| String | The String class represents character strings. |
| StringBuffer | A string buffer implements 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. |
| Exception Summary | |
| 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
but no definition for the class with the specified name could be found. |
| Exception | The class Exception and its subclasses are a form of
Throwable that indicates conditions that a reasonable
application might want to catch. |
| IllegalAccessException | Thrown when an application tries to load in a class, but the currently executing method does not have access to the definition of the specified class, because the class is not public and in another package. |
| 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 because it is an interface or is an abstract class. |
| InterruptedException | Thrown when a thread is waiting, sleeping, or otherwise paused for
a long time and another thread interrupts it using the
interrupt method in class Thread. |
| NegativeArraySizeException | Thrown if an application tries to create an array with negative size. |
| 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. |
| 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 the charAt method in class
String and by other String
methods to indicate that an index is either negative or greater
than or equal to the size of the string. |
| Error Summary | |
| Error | An Error is a subclass of Throwable
that indicates serious problems that a reasonable application
should not try to catch. |
| 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. |
| VirtualMachineError | Thrown to indicate that the Java Virtual Machine is broken or has run out of resources necessary for it to continue operating. |
MID Profile Language Classes included from Java 2 Standard
Edition. In addition to the java.lang classes
specified in the Connected Limited Device Configuration the
Mobile Information Device Profile includes the following
class from Java 2 Standard Edition.
IllegalStateExceptions are thrown when illegal
transitions are requested, such as scheduling a
TimerTask or in the containment of
user interface components.
The MIDP is based on the Connected, Limited Device Configuration (CLDC). Some features of the CLDC are modified or extended by the MIDP.
The MIDP defines the following property values (in addition to
those defined in the CLDC specification) that MUST be made
available to the application using
java.lang.System.getProperty :
|
System Property |
Description |
|---|---|
|
|
The current locale of the device, may be |
|
|
is a blank (Unicode U+0020) separated list of the J2ME profiles that this device supports. For MIDP 2.0 devices, this property MUST contain at least "MIDP-2.0" |
Other properties may be available from other profiles or the implementation.
Property microedition.locale
The locale property, if not null, MUST consist of
the language and MAY optionally also contain the country code,
and variant separated by "-" (Unicode U+002D). For example,
"fr-FR" or "en-US."
(Note: the MIDP 1.0 specification used the HTTP formatting of
language tags as defined in
RFC3066
Tags for the Identification of
Languages. This is different from the J2SE definition
for Locale printed strings where fields are
separated by "_" (Unicode U+005F).
)
The language codes MUST be the lower-case, two-letter codes as defined by ISO-639.
The country code MUST be the upper-case, two-letter codes as defined by ISO-3166.
Application resource files are accessed using
getResourceAsStream(String name)
in
java.lang.Class
. In the MIDP specification,
getResourceAsStream
is used to allow resource files to be retrieved from the MIDlet
Suite's JAR file.
Resource names refer to the contents of the MIDlet Suite JAR file. Absolute pathnames, beginning with "/" are fully qualified file names within the jar file.
Relative pathnames, not beginning with "/" are
relative to the class upon which
getResourceAsStream is called. Relative names are
converted to absolute by prepending a "/" followed by
the fully qualified package with "." characters
converted to "/" and a separator of "/".
The resulting string is reduced to canonical form by applying
as many times as possible the following:
The canonical resource name is the absolute pathname of the resource within the JAR.
In no case can the path extend outside the JAR file, and
resources outside the JAR file MUST NOT be accessible. For
example, using "../../" does NOT point outside the JAR
file.
If there are any remaining "." or ".."
characters they are treated literally in locating the
resource. No resource can exist with that name so
null is returned from
Class.getResourceAsStream.
Also, devices MUST NOT allow classfiles to be read from
the JAR file as resources, but all other files MUST be
accessible.
The behavior of
java.lang.System.exit
MUST throw a
java.lang.SecurityException
when invoked by a MIDlet. The only way a MIDlet can indicate that it
is complete is by calling
MIDlet.notifyDestroyed
.
The behavior of
java.lang.Runtime.exit
MUST throw a
java.lang.SecurityException
when invoked by a MIDlet. The only way a MIDlet can indicate that it
is complete is by calling
MIDlet.notifyDestroyed
.
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