public class DateFormat extends Format
http://docs.oracle.com/javase/6/docs/api/java/text/DateFormat.html
Modifier and Type | Field and Description |
---|---|
static int |
DEFAULT
Constant for default style (MEDIUM) parsing/formatting pattern.
|
static int |
FULL
Constant for full style parsing/formatting pattern.
|
static int |
LONG
Constant for long style parsing/formatting pattern.
|
static int |
MEDIUM
Constant for medium style parsing/formatting pattern.
|
static int |
SHORT
Constant for short style parsing/formatting pattern.
|
Modifier and Type | Method and Description |
---|---|
Object |
clone()
Creates and returns a copy of this object.
|
boolean |
equals(Object obj)
Indicates whether some other object is "equal to" this one.
|
String |
format(Date source)
Format a given date.
|
String |
format(Object obj)
Format a given object.
|
static DateFormat |
getDateInstance()
Get a DateFormat instance with default style for date (SHORT).
|
static DateFormat |
getDateInstance(int style)
Get a DateFormat instance that uses a given style for dates.
|
static DateFormat |
getDateTimeInstance(int dateStyle,
int timeStyle)
Get a DateFormat instance that uses a given style for dates and times.
|
static DateFormat |
getInstance()
Get a DateFormat instance with default style for date/time (SHORT/SHORT).
|
static DateFormat |
getTimeInstance()
Get a DateFormat instance with default style for time (SHORT).
|
static DateFormat |
getTimeInstance(int style)
Get a DateFormat instance that uses a given style for times.
|
int |
hashCode()
Returns a hash code value for the object.
|
Date |
parse(String source)
NOT IMPLEMENTED - use SimpleDateFormat for parsing instead.
|
Object |
parseObject(String source)
NOT IMPLEMENTED - use SimpleDateFormat for parsing instead.
|
public static final int FULL
public static final int LONG
public static final int MEDIUM
public static final int SHORT
public static final int DEFAULT
public String format(Object obj) throws IllegalArgumentException
format
in class Format
obj
- object to be formatted to text.IllegalArgumentException
- of the source can not be formatted.public String format(Date source)
source
- date to be formatted.public Object parseObject(String source) throws ParseException
parseObject
in class Format
source
- document to be parsed.ParseException
- if the source could not be parsed.public Date parse(String source) throws ParseException
ParseException
public static final DateFormat getInstance()
public static final DateFormat getDateInstance()
public static final DateFormat getTimeInstance()
public static final DateFormat getDateInstance(int style)
public static final DateFormat getTimeInstance(int style)
public static final DateFormat getDateTimeInstance(int dateStyle, int timeStyle)
public int hashCode()
Object
HashMap
.
The general contract of hashCode
is:
hashCode
method
must consistently return the same integer, provided no information
used in equals
comparisons on the object is modified.
This integer need not remain consistent from one execution of an
application to another execution of the same application.
equals(Object)
method, then calling the hashCode
method on each of
the two objects must produce the same integer result.
Object.equals(java.lang.Object)
method, then calling the hashCode
method on each of the
two objects must produce distinct integer results. However, the
programmer should be aware that producing distinct integer results
for unequal objects may improve the performance of hash tables.
As much as is reasonably practical, the hashCode method defined by
class Object
does return distinct integers for distinct
objects. (This is typically implemented by converting the internal
address of the object into an integer, but this implementation
technique is not required by the
Java™ programming language.)
hashCode
in class Object
Object.equals(java.lang.Object)
,
System.identityHashCode(java.lang.Object)
public boolean equals(Object obj)
Object
The equals
method implements an equivalence relation
on non-null object references:
x
, x.equals(x)
should return
true
.
x
and y
, x.equals(y)
should return true
if and only if
y.equals(x)
returns true
.
x
, y
, and z
, if
x.equals(y)
returns true
and
y.equals(z)
returns true
, then
x.equals(z)
should return true
.
x
and y
, multiple invocations of
x.equals(y)
consistently return true
or consistently return false
, provided no
information used in equals
comparisons on the
objects is modified.
x
,
x.equals(null)
should return false
.
The equals
method for class Object
implements
the most discriminating possible equivalence relation on objects;
that is, for any non-null reference values x
and
y
, this method returns true
if and only
if x
and y
refer to the same object
(x == y
has the value true
).
Note that it is generally necessary to override the hashCode
method whenever this method is overridden, so as to maintain the
general contract for the hashCode
method, which states
that equal objects must have equal hash codes.
equals
in class Object
obj
- the reference object with which to compare.true
if this object is the same as the obj
argument; false
otherwise.Object.hashCode()
,
HashMap
public Object clone()
Object
x
, the expression:
will be true, and that the expression:x.clone() != x
will bex.clone().getClass() == x.getClass()
true
, but these are not absolute requirements.
While it is typically the case that:
will bex.clone().equals(x)
true
, this is not an absolute requirement.
By convention, the returned object should be obtained by calling
super.clone
. If a class and all of its superclasses (except
Object
) obey this convention, it will be the case that
x.clone().getClass() == x.getClass()
.
By convention, the object returned by this method should be independent
of this object (which is being cloned). To achieve this independence,
it may be necessary to modify one or more fields of the object returned
by super.clone
before returning it. Typically, this means
copying any mutable objects that comprise the internal "deep structure"
of the object being cloned and replacing the references to these
objects with references to the copies. If a class contains only
primitive fields or references to immutable objects, then it is usually
the case that no fields in the object returned by super.clone
need to be modified.
The method clone
for class Object
performs a
specific cloning operation. First, if the class of this object does
not implement the interface Cloneable
, then a
CloneNotSupportedException
is thrown. Note that all arrays
are considered to implement the interface Cloneable
and that
the return type of the clone
method of an array type T[]
is T[]
where T is any reference or primitive type.
Otherwise, this method creates a new instance of the class of this
object and initializes all its fields with exactly the contents of
the corresponding fields of this object, as if by assignment; the
contents of the fields are not themselves cloned. Thus, this method
performs a "shallow copy" of this object, not a "deep copy" operation.
The class Object
does not itself implement the interface
Cloneable
, so calling the clone
method on an object
whose class is Object
will result in throwing an
exception at run time.