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javax.imageio
class ImageWriteParam

java.lang.Object extended by javax.imageio.IIOParam extended by javax.imageio.ImageWriteParam
Direct Known Subclasses:
BMPImageWriteParam, JPEGImageWriteParam

Most common way to construct:

ImageWriter writer = …;

ImageWriteParam param = writer.getDefaultWriteParam();

Based on 81 examples


public class ImageWriteParam
extends IIOParam

A class describing how a stream is to be encoded. Instances of this class or its subclasses are used to supply prescriptive "how-to" information to instances of ImageWriter.

A plug-in for a specific image format may define a subclass of this class, and return objects of that class from the getDefaultWriteParam method of its ImageWriter implementation. For example, the built-in JPEG writer plug-in will return instances of javax.imageio.plugins.jpeg.JPEGImageWriteParam.

The region of the image to be written is determined by first intersecting the actual bounds of the image with the rectangle specified by IIOParam.setSourceRegion, if any. If the resulting rectangle has a width or height of zero, the writer will throw an IIOException. If the intersection is non-empty, writing will commence with the first subsampled pixel and include additional pixels within the intersected bounds according to the horizontal and vertical subsampling factors specified by {@link IIOParam#setSourceSubsampling IIOParam.setSourceSubsampling}.

Individual features such as tiling, progressive encoding, and compression may be set in one of four modes. MODE_DISABLED disables the features; MODE_DEFAULT enables the feature with writer-controlled parameter values; MODE_EXPLICIT enables the feature and allows the use of a set method to provide additional parameters; and MODE_COPY_FROM_METADATA copies relevant parameter values from the stream and image metadata objects passed to the writer. The default for all features is MODE_COPY_FROM_METADATA. Non-standard features supplied in subclasses are encouraged, but not required to use a similar scheme.

Plug-in writers may extend the functionality of ImageWriteParam by providing a subclass that implements additional, plug-in specific interfaces. It is up to the plug-in to document what interfaces are available and how they are to be used. Writers will silently ignore any extended features of an ImageWriteParam subclass of which they are not aware. Also, they may ignore any optional features that they normally disable when creating their own ImageWriteParam instances via getDefaultWriteParam.

Note that unless a query method exists for a capability, it must be supported by all ImageWriter implementations (e.g. progressive encoding is optional, but subsampling must be supported).


Field Summary
protected boolean canOffsetTiles
          A boolean that is true if this ImageWriteParam allows tiling grid offset parameters to be set.
protected boolean canWriteCompressed
          A boolean that is true if this writer can write images using compression.
protected boolean canWriteProgressive
          A boolean that is true if this ImageWriteParam allows images to be written as a progressive sequence of increasing quality passes.
protected boolean canWriteTiles
          A boolean that is true if this ImageWriteParam allows tile width and tile height parameters to be set.
protected int compressionMode
          The mode controlling compression settings, which must be set to one of the four MODE_* values.
protected float compressionQuality
          A float containing the current compression quality setting.
protected String compressionType
          A String containing the name of the current compression type, or null if none is set.
protected String[] compressionTypes
          An array of Strings containing the names of the available compression types.
protected Locale locale
          A Locale to be used to localize compression type names and quality descriptions, or null to use a default Locale.
static int MODE_COPY_FROM_METADATA
          A constant value that may be passed into methods such as setTilingMode, setProgressiveMode, or setCompressionMode to enable that feature for future writes.
static int MODE_DEFAULT
          A constant value that may be passed into methods such as setTilingMode, setProgressiveMode, and setCompressionMode to enable that feature for future writes.
static int MODE_DISABLED
          A constant value that may be passed into methods such as setTilingMode, setProgressiveMode, and setCompressionMode to disable a feature for future writes.
static int MODE_EXPLICIT
          A constant value that may be passed into methods such as setTilingMode or setCompressionMode to enable a feature for future writes.
protected Dimension[] preferredTileSizes
          An array of preferred tile size range pairs.
protected int progressiveMode
          The mode controlling progressive encoding, which must be set to one of the four MODE_* values, except MODE_EXPLICIT.
protected int tileGridXOffset
          The amount by which the tile grid origin should be offset horizontally from the image origin if tiling has been set, or 0 otherwise.
protected int tileGridYOffset
          The amount by which the tile grid origin should be offset vertically from the image origin if tiling has been set, or 0 otherwise.
protected int tileHeight
          The height of each tile if tiling has been set, or 0 otherwise.
protected int tileWidth
          The width of each tile if tiling has been set, or 0 otherwise.
protected int tilingMode
          The mode controlling tiling settings, which Must be set to one of the four MODE_* values.
protected boolean tilingSet
          A boolean that is true if tiling parameters have been specified.
 
Fields inherited from class javax.imageio.IIOParam
controller, defaultController, destinationOffset, destinationType, sourceBands, sourceRegion, sourceXSubsampling, sourceYSubsampling, subsamplingXOffset, subsamplingYOffset
 
Constructor Summary
protected

          Constructs an empty ImageWriteParam.
 

          Constructs an ImageWriteParam set to use a given Locale.
 
Method Summary
 boolean

          Returns true if the writer can perform tiling with non-zero grid offsets while writing.
 boolean

          Returns true if this writer supports compression.
 boolean

          Returns true if the writer can write out images as a series of passes of progressively increasing quality.
 boolean

          Returns true if the writer can perform tiling while writing.
 float
getBitRate(float quality)

          Returns a float indicating an estimate of the number of bits of output data for each bit of input image data at the given quality level.
 int

          Returns the current compression mode, if compression is supported.
 float

          Returns the current compression quality setting.
 String[]

          Returns an array of Strings that may be used along with getCompressionQualityValues as part of a user interface for setting or displaying the compression quality level.
 float[]

          Returns an array of floats that may be used along with getCompressionQualityDescriptions as part of a user interface for setting or displaying the compression quality level.
 String

          Returns the currently set compression type, or null if none has been set.
 String[]

          Returns a list of available compression types, as an array or Strings, or null if a compression type may not be chosen using these interfaces.
 Locale

          Returns the currently set Locale, or null if only a default Locale is supported.
 String

          Returns a localized version of the name of the current compression type, using the Locale returned by getLocale.
 Dimension[]

          Returns an array of Dimensions indicating the legal size ranges for tiles as they will be encoded in the output file or stream.
 int

          Returns the current mode for writing the stream in a progressive manner.
 int

          Returns the horizontal tile grid offset of an image as it will be written to the output stream.
 int

          Returns the vertical tile grid offset of an image as it will be written to the output stream.
 int

          Returns the height of each tile in an image as it will be written to the output stream.
 int

          Returns the width of each tile in an image as it will be written to the output stream.
 int

          Returns the current tiling mode, if tiling is supported.
 boolean

          Returns true if the current compression type provides lossless compression.
 void

          Specifies whether compression is to be performed, and if so how compression parameters are to be determined.
 void
setCompressionQuality(float quality)

          Sets the compression quality to a value between 0 and 1.
 void
setCompressionType(String compressionType)

          Sets the compression type to one of the values indicated by getCompressionTypes.
 void

          Specifies that the writer is to write the image out in a progressive mode such that the stream will contain a series of scans of increasing quality.
 void
setTiling(int tileWidth, int tileHeight, int tileGridXOffset, int tileGridYOffset)

          Specifies that the image should be tiled in the output stream.
 void
setTilingMode(int mode)

          Determines whether the image will be tiled in the output stream and, if it will, how the tiling parameters will be determined.
 void

          Removes any previous compression type and quality settings.
 void

          Removes any previous tile grid parameters specified by calls to setTiling.
 
Methods inherited from class javax.imageio.IIOParam
activateController, getController, getDefaultController, getDestinationOffset, getDestinationType, getSourceBands, getSourceRegion, getSourceXSubsampling, getSourceYSubsampling, getSubsamplingXOffset, getSubsamplingYOffset, hasController, setController, setDestinationOffset, setDestinationType, setSourceBands, setSourceRegion, setSourceSubsampling
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

canOffsetTiles

protected boolean canOffsetTiles
A boolean that is true if this ImageWriteParam allows tiling grid offset parameters to be set. By default, the value is false. Subclasses must set the value manually.

Subclasses that do not support writing tiles, or that supprt writing but not offsetting tiles must ensure that this value is set to false.


canWriteCompressed

protected boolean canWriteCompressed
A boolean that is true if this writer can write images using compression. By default, the value is false. Subclasses must set the value manually.

Subclasses that do not support compression must ensure that this value is set to false.


canWriteProgressive

protected boolean canWriteProgressive
A boolean that is true if this ImageWriteParam allows images to be written as a progressive sequence of increasing quality passes. By default, the value is false. Subclasses must set the value manually.

Subclasses that do not support progressive encoding must ensure that this value is set to false.


canWriteTiles

protected boolean canWriteTiles
A boolean that is true if this ImageWriteParam allows tile width and tile height parameters to be set. By default, the value is false. Subclasses must set the value manually.

Subclasses that do not support writing tiles should ensure that this value is set to false.


compressionMode

protected int compressionMode
The mode controlling compression settings, which must be set to one of the four MODE_* values. The default is MODE_COPY_FROM_METADATA.

Subclasses that do not support compression may ignore this value.


compressionQuality

protected float compressionQuality
A float containing the current compression quality setting. The initial value is 1.0F.

Subclasses that do not support compression may ignore this value.


compressionType

protected String compressionType
A String containing the name of the current compression type, or null if none is set.

Subclasses that do not support compression may ignore this value.


compressionTypes

protected String[] compressionTypes
An array of Strings containing the names of the available compression types. Subclasses must set the value manually.

Subclasses that do not support compression may ignore this value.


locale

protected Locale locale
A Locale to be used to localize compression type names and quality descriptions, or null to use a default Locale. Subclasses must set the value manually.

MODE_COPY_FROM_METADATA

public static final int MODE_COPY_FROM_METADATA
A constant value that may be passed into methods such as setTilingMode, setProgressiveMode, or setCompressionMode to enable that feature for future writes. That is, when this mode is enabled the stream will be tiled, progressive, or compressed based on the contents of stream and/or image metadata passed into the write operation, and any relevant accessor methods will throw an IllegalStateException.

This is the default mode for all features, so that a read including metadata followed by a write including metadata will preserve as much information as possible.


MODE_DEFAULT

public static final int MODE_DEFAULT
A constant value that may be passed into methods such as setTilingMode, setProgressiveMode, and setCompressionMode to enable that feature for future writes. That is, when this mode is enabled the stream will be tiled, progressive, or compressed according to a sensible default chosen internally by the writer in a plug-in dependent way, and the relevant accessor methods will throw an IllegalStateException.

MODE_DISABLED

public static final int MODE_DISABLED
A constant value that may be passed into methods such as setTilingMode, setProgressiveMode, and setCompressionMode to disable a feature for future writes. That is, when this mode is set the stream will not be tiled, progressive, or compressed, and the relevant accessor methods will throw an IllegalStateException.

MODE_EXPLICIT

public static final int MODE_EXPLICIT
A constant value that may be passed into methods such as setTilingMode or setCompressionMode to enable a feature for future writes. That is, when this mode is set the stream will be tiled or compressed according to additional information supplied to the corresponding set methods in this class and retrievable from the corresponding get methods. Note that this mode is not supported for progressive output.

preferredTileSizes

protected Dimension[] preferredTileSizes
An array of preferred tile size range pairs. The default value is null, which indicates that there are no preferred sizes. If the value is non-null, it must have an even length of at least two.

Subclasses that do not support writing tiles may ignore this value.


progressiveMode

protected int progressiveMode
The mode controlling progressive encoding, which must be set to one of the four MODE_* values, except MODE_EXPLICIT. The default is MODE_COPY_FROM_METADATA.

Subclasses that do not support progressive encoding may ignore this value.


tileGridXOffset

protected int tileGridXOffset
The amount by which the tile grid origin should be offset horizontally from the image origin if tiling has been set, or 0 otherwise. The initial value is 0.

Subclasses that do not support offsetting tiles may ignore this value.


tileGridYOffset

protected int tileGridYOffset
The amount by which the tile grid origin should be offset vertically from the image origin if tiling has been set, or 0 otherwise. The initial value is 0.

Subclasses that do not support offsetting tiles may ignore this value.


tileHeight

protected int tileHeight
The height of each tile if tiling has been set, or 0 otherwise. The initial value is 0.

Subclasses that do not support tiling may ignore this value.


tileWidth

protected int tileWidth
The width of each tile if tiling has been set, or 0 otherwise.

Subclasses that do not support tiling may ignore this value.


tilingMode

protected int tilingMode
The mode controlling tiling settings, which Must be set to one of the four MODE_* values. The default is MODE_COPY_FROM_METADATA.

Subclasses that do not writing tiles may ignore this value.


tilingSet

protected boolean tilingSet
A boolean that is true if tiling parameters have been specified.

Subclasses that do not support writing tiles may ignore this value.

Constructor Detail

ImageWriteParam

protected ImageWriteParam()
Constructs an empty ImageWriteParam. It is up to the subclass to set up the instance variables properly.


ImageWriteParam

public ImageWriteParam(Locale locale)
Constructs an ImageWriteParam set to use a given Locale.

Parameters:
locale - a Locale to be used to localize compression type names and quality descriptions, or null.
Method Detail

canOffsetTiles

public boolean canOffsetTiles()
Returns true if the writer can perform tiling with non-zero grid offsets while writing. If this method returns false, then setTiling will throw an UnsupportedOperationException if the grid offset arguments are not both zero. If canWriteTiles returns false, this method will return false as well.

Returns:
true if the writer supports non-zero tile offsets.

canWriteCompressed

public boolean canWriteCompressed()
Returns true if this writer supports compression.

Returns:
true if the writer supports compression.

canWriteProgressive

public boolean canWriteProgressive()
Returns true if the writer can write out images as a series of passes of progressively increasing quality.

Returns:
true if the writer supports progressive encoding.

canWriteTiles

public boolean canWriteTiles()
Returns true if the writer can perform tiling while writing. If this method returns false, then setTiling will throw an UnsupportedOperationException.

Returns:
true if the writer supports tiling.

getBitRate

public float getBitRate(float quality)
Returns a float indicating an estimate of the number of bits of output data for each bit of input image data at the given quality level. The value will typically lie between 0 and 1, with smaller values indicating more compression. A special value of -1.0F is used to indicate that no estimate is available.

If there are multiple compression types but none has been set, an IllegalStateException is thrown.

The default implementation checks that compression is supported and the compression mode is MODE_EXPLICIT. If so, if getCompressionTypes() is null or getCompressionType() is non-null, and quality is within bounds, it returns -1.0.

Parameters:
quality - the quality setting whose bit rate is to be queried.
Returns:
an estimate of the compressed bit rate, or -1.0F if no estimate is available.

getCompressionMode

public int getCompressionMode()
Returns the current compression mode, if compression is supported.

Returns:
the current compression mode.

getCompressionQuality

public float getCompressionQuality()
Returns the current compression quality setting.

If there are multiple compression types but none has been set, an IllegalStateException is thrown.

The default implementation checks that compression is supported and that the compression mode is MODE_EXPLICIT. If so, if getCompressionTypes() is null or getCompressionType() is non-null, it returns the value of the compressionQuality instance variable.

Returns:
the current compression quality setting.

getCompressionQualityDescriptions

public String[] getCompressionQualityDescriptions()
Returns an array of Strings that may be used along with getCompressionQualityValues as part of a user interface for setting or displaying the compression quality level. The String with index i provides a description of the range of quality levels between getCompressionQualityValues[i] and getCompressionQualityValues[i + 1]. Note that the length of the array returned from getCompressionQualityValues will always be one greater than that returned from getCompressionQualityDescriptions.

As an example, the strings "Good", "Better", and "Best" could be associated with the ranges [0, .33), [.33, .66), and [.66, 1.0]. In this case, getCompressionQualityDescriptions would return { "Good", "Better", "Best" } and getCompressionQualityValues would return { 0.0F, .33F, .66F, 1.0F }.

If no descriptions are available, null is returned. If null is returned from getCompressionQualityValues, this method must also return null.

The descriptions should be localized for the Locale returned by getLocale, if it is non-null.

If there are multiple compression types but none has been set, an IllegalStateException is thrown.

The default implementation checks that compression is supported and that the compression mode is MODE_EXPLICIT. If so, if getCompressionTypes() is null or getCompressionType() is non-null, it returns null.

Returns:
an array of Strings containing localized descriptions of the compression quality levels.

getCompressionQualityValues

public float[] getCompressionQualityValues()
Returns an array of floats that may be used along with getCompressionQualityDescriptions as part of a user interface for setting or displaying the compression quality level. See {@link #getCompressionQualityDescriptions getCompressionQualityDescriptions} for more information.

If no descriptions are available, null is returned. If null is returned from getCompressionQualityDescriptions, this method must also return null.

If there are multiple compression types but none has been set, an IllegalStateException is thrown.

The default implementation checks that compression is supported and that the compression mode is MODE_EXPLICIT. If so, if getCompressionTypes() is null or getCompressionType() is non-null, it returns null.

Returns:
an array of floats indicating the boundaries between the compression quality levels as described by the Strings from getCompressionQualityDescriptions.

getCompressionType

public String getCompressionType()
Returns the currently set compression type, or null if none has been set. The type is returned as a String from among those returned by getCompressionTypes. If no compression type has been set, null is returned.

The default implementation checks whether compression is supported and the compression mode is MODE_EXPLICIT. If so, it returns the value of the compressionType instance variable.

Returns:
the current compression type as a String, or null if no type is set.

getCompressionTypes

public String[] getCompressionTypes()
Returns a list of available compression types, as an array or Strings, or null if a compression type may not be chosen using these interfaces. The array returned is a copy.

If the writer only offers a single, mandatory form of compression, it is not necessary to provide any named compression types. Named compression types should only be used where the user is able to make a meaningful choice between different schemes.

The default implementation checks if compression is supported and throws an UnsupportedOperationException if not. Otherwise, it returns a clone of the compressionTypes instance variable if it is non-null, or else returns null.

Returns:
an array of Strings containing the (non-localized) names of available compression types, or null.

getLocale

public Locale getLocale()
Returns the currently set Locale, or null if only a default Locale is supported.

Returns:
the current Locale, or null.

getLocalizedCompressionTypeName

public String getLocalizedCompressionTypeName()
Returns a localized version of the name of the current compression type, using the Locale returned by getLocale.

The default implementation checks whether compression is supported and the compression mode is MODE_EXPLICIT. If so, if compressionType is non-null the value of getCompressionType is returned as a convenience.

Returns:
a String containing a localized version of the name of the current compression type.

getPreferredTileSizes

public Dimension[] getPreferredTileSizes()
Returns an array of Dimensions indicating the legal size ranges for tiles as they will be encoded in the output file or stream. The returned array is a copy.

The information is returned as a set of pairs; the first element of a pair contains an (inclusive) minimum width and height, and the second element contains an (inclusive) maximum width and height. Together, each pair defines a valid range of sizes. To specify a fixed size, use the same width and height for both elements. To specify an arbitrary range, a value of null is used in place of an actual array of Dimensions.

If no array is specified on the constructor, but tiling is allowed, then this method returns null.

Returns:
an array of Dimensions with an even length of at least two, or null.

getProgressiveMode

public int getProgressiveMode()
Returns the current mode for writing the stream in a progressive manner.

Returns:
the current mode for progressive encoding.

getTileGridXOffset

public int getTileGridXOffset()
Returns the horizontal tile grid offset of an image as it will be written to the output stream. If tiling parameters have not been set, an IllegalStateException is thrown.

Returns:
the tile grid X offset to be used for encoding.

getTileGridYOffset

public int getTileGridYOffset()
Returns the vertical tile grid offset of an image as it will be written to the output stream. If tiling parameters have not been set, an IllegalStateException is thrown.

Returns:
the tile grid Y offset to be used for encoding.

getTileHeight

public int getTileHeight()
Returns the height of each tile in an image as it will be written to the output stream. If tiling parameters have not been set, an IllegalStateException is thrown.

Returns:
the tile height to be used for encoding.

getTileWidth

public int getTileWidth()
Returns the width of each tile in an image as it will be written to the output stream. If tiling parameters have not been set, an IllegalStateException is thrown.

Returns:
the tile width to be used for encoding.

getTilingMode

public int getTilingMode()
Returns the current tiling mode, if tiling is supported. Otherwise throws an UnsupportedOperationException.

Returns:
the current tiling mode.

isCompressionLossless

public boolean isCompressionLossless()
Returns true if the current compression type provides lossless compression. If a plug-in provides only one mandatory compression type, then this method may be called without calling setCompressionType first.

If there are multiple compression types but none has been set, an IllegalStateException is thrown.

The default implementation checks whether compression is supported and the compression mode is MODE_EXPLICIT. If so, if getCompressionTypes() is null or getCompressionType() is non-null true is returned as a convenience.

Returns:
true if the current compression type is lossless.

setCompressionMode

public void setCompressionMode(int mode)
Specifies whether compression is to be performed, and if so how compression parameters are to be determined. The mode argument must be one of the four modes, interpreted as follows:

The default is MODE_COPY_FROM_METADATA.

Parameters:
mode - The mode for setting compression in the output stream.

setCompressionQuality

public void setCompressionQuality(float quality)
Sets the compression quality to a value between 0 and 1. Only a single compression quality setting is supported by default; writers can provide extended versions of ImageWriteParam that offer more control. For lossy compression schemes, the compression quality should control the tradeoff between file size and image quality (for example, by choosing quantization tables when writing JPEG images). For lossless schemes, the compression quality may be used to control the tradeoff between file size and time taken to perform the compression (for example, by optimizing row filters and setting the ZLIB compression level when writing PNG images).

A compression quality setting of 0.0 is most generically interpreted as "high compression is important," while a setting of 1.0 is most generically interpreted as "high image quality is important."

If there are multiple compression types but none has been set, an IllegalStateException is thrown.

The default implementation checks that compression is supported, and that the compression mode is MODE_EXPLICIT. If so, if getCompressionTypes() returns null or compressionType is non-null it sets the compressionQuality instance variable.

Parameters:
quality - a float between 0and 1 indicating the desired quality level.

setCompressionType

public void setCompressionType(String compressionType)
Sets the compression type to one of the values indicated by getCompressionTypes. If a value of null is passed in, any previous setting is removed.

The default implementation checks whether compression is supported and the compression mode is MODE_EXPLICIT. If so, it calls getCompressionTypes and checks if compressionType is one of the legal values. If it is, the compressionType instance variable is set. If compressionType is null, the instance variable is set without performing any checking.

Parameters:
compressionType - one of the Strings returned by getCompressionTypes, or null to remove any previous setting.

setProgressiveMode

public void setProgressiveMode(int mode)
Specifies that the writer is to write the image out in a progressive mode such that the stream will contain a series of scans of increasing quality. If progressive encoding is not supported, an UnsupportedOperationException will be thrown.

The mode argument determines how the progression parameters are chosen, and must be either MODE_DISABLED, MODE_COPY_FROM_METADATA, or MODE_DEFAULT. Otherwise an IllegalArgumentException is thrown.

The modes are interpreted as follows:

The default is MODE_COPY_FROM_METADATA.

Parameters:
mode - The mode for setting progression in the output stream.

setTiling

public void setTiling(int tileWidth,
                      int tileHeight,
                      int tileGridXOffset,
                      int tileGridYOffset)
Specifies that the image should be tiled in the output stream. The tileWidth and tileHeight parameters specify the width and height of the tiles in the file. If the tile width or height is greater than the width or height of the image, the image is not tiled in that dimension.

If canOffsetTiles returns false, then the tileGridXOffset and tileGridYOffset parameters must be zero.

Parameters:
tileWidth - the width of each tile.
tileHeight - the height of each tile.
tileGridXOffset - the horizontal offset of the tile grid.
tileGridYOffset - the vertical offset of the tile grid.

setTilingMode

public void setTilingMode(int mode)
Determines whether the image will be tiled in the output stream and, if it will, how the tiling parameters will be determined. The modes are interpreted as follows:

Parameters:
mode - The mode to use for tiling.

unsetCompression

public void unsetCompression()
Removes any previous compression type and quality settings.

The default implementation sets the instance variable compressionType to null, and the instance variable compressionQuality to 1.0F.


unsetTiling

public void unsetTiling()
Removes any previous tile grid parameters specified by calls to setTiling.

The default implementation sets the instance variables tileWidth, tileHeight, tileGridXOffset, and tileGridYOffset to 0.



This documentation differs from the official API. Jadeite adds extra features to the API including: variable font sizes, constructions examples, placeholders for classes and methods, and auto-generated “See Also” links. Additionally it is missing some items found in standard Javadoc documentation, including: generics type information, “Deprecated” tags and comments, “See Also” links, along with other minor differences. Please send any questions or feedback to bam@cs.cmu.edu.
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Copyright 2008 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.
The official Sun™ documentation can be found here at http://java.sun.com/javase/6/docs/api/.