java.awt
public final class PageAttributes extends Object implements Cloneable
Modifier and Type | Class and Description |
---|---|
static class |
PageAttributes.ColorType |
static class |
PageAttributes.MediaType |
static class |
PageAttributes.OrientationRequestedType |
static class |
PageAttributes.OriginType |
static class |
PageAttributes.PrintQualityType |
Constructor and Description |
---|
PageAttributes() |
PageAttributes(PageAttributes.ColorType color,
PageAttributes.MediaType media,
PageAttributes.OrientationRequestedType orientation,
PageAttributes.OriginType origin,
PageAttributes.PrintQualityType quality,
int[] resolution) |
PageAttributes(PageAttributes attr) |
public PageAttributes()
public PageAttributes(PageAttributes attr)
public PageAttributes(PageAttributes.ColorType color, PageAttributes.MediaType media, PageAttributes.OrientationRequestedType orientation, PageAttributes.OriginType origin, PageAttributes.PrintQualityType quality, int[] resolution)
public Object clone()
Object
o == o.clone()
is falseo.getClass() == o.clone().getClass()
is trueo.equals(o)
is trueHowever, these are not strict requirements, and may
be violated if necessary. Of the three requirements, the
last is the most commonly violated, particularly if the
subclass does not override Object.equals(Object)
.
If the Object you call clone() on does not implement
Cloneable
(which is a placeholder interface), then
a CloneNotSupportedException is thrown. Notice that
Object does not implement Cloneable; this method exists
as a convenience for subclasses that do.
Object's implementation of clone allocates space for the new Object using the correct class, without calling any constructors, and then fills in all of the new field values with the old field values. Thus, it is a shallow copy. However, subclasses are permitted to make a deep copy.
All array types implement Cloneable, and override
this method as follows (it should never fail):
public Object clone() { try { super.clone(); } catch (CloneNotSupportedException e) { throw new InternalError(e.getMessage()); } }
public void set(PageAttributes attr)
public PageAttributes.ColorType getColor()
public void setColor(PageAttributes.ColorType color)
public PageAttributes.MediaType getMedia()
public void setMedia(PageAttributes.MediaType media)
public void setMediaToDefault()
public PageAttributes.OrientationRequestedType getOrientationRequested()
public void setOrientationRequested(PageAttributes.OrientationRequestedType orientation)
public void setOrientationRequested(int orientation)
public void setOrientationRequestedToDefault()
public PageAttributes.OriginType getOrigin()
public void setOrigin(PageAttributes.OriginType origin)
public PageAttributes.PrintQualityType getPrintQuality()
public void setPrintQuality(PageAttributes.PrintQualityType quality)
public void setPrintQuality(int quality)
public void setPrintQualityToDefault()
public int[] getPrinterResolution()
public void setPrinterResolution(int[] resolution)
public void setPrinterResolution(int resolution)
public void setPrinterResolutionToDefault()
public boolean equals(Object o)
Object
There are some fairly strict requirements on this
method which subclasses must follow:
a.equals(b)
and
b.equals(c)
, then a.equals(c)
must be true as well.a.equals(b)
and
b.equals(a)
must have the same value.a.equals(a)
must
always be true.a.equals(null)
must be false.a.equals(b)
must imply
a.hashCode() == b.hashCode()
.
The reverse is not true; two objects that are not
equal may have the same hashcode, but that has
the potential to harm hashing performance.This is typically overridden to throw a ClassCastException
if the argument is not comparable to the class performing
the comparison, but that is not a requirement. It is legal
for a.equals(b)
to be true even though
a.getClass() != b.getClass()
. Also, it
is typical to never cause a NullPointerException
.
In general, the Collections API (java.util
) use the
equals
method rather than the ==
operator to compare objects. However, IdentityHashMap
is an exception to this rule, for its own good reasons.
The default implementation returns this == o
.
equals
in class Object
o
- the Object to compare toObject.hashCode()
public int hashCode()
Object
There are some requirements on this method which
subclasses must follow:
a.equals(b)
is true, then
a.hashCode() == b.hashCode()
must be as well.
However, the reverse is not necessarily true, and two
objects may have the same hashcode without being equal.Notice that since hashCode
is used in
Hashtable
and other hashing classes,
a poor implementation will degrade the performance of hashing
(so don't blindly implement it as returning a constant!). Also,
if calculating the hash is time-consuming, a class may consider
caching the results.
The default implementation returns
System.identityHashCode(this)
hashCode
in class Object
Object.equals(Object)
,
System.identityHashCode(Object)
public String toString()
Object
System.out.println()
and such.
It is typical, but not required, to ensure that this method
never completes abruptly with a RuntimeException
.
This method will be called when performing string
concatenation with this object. If the result is
null
, string concatenation will instead
use "null"
.
The default implementation returns
getClass().getName() + "@" +
Integer.toHexString(hashCode())
.
toString
in class Object
Object.getClass()
,
Object.hashCode()
,
Class.getName()
,
Integer.toHexString(int)