org.apache.hadoop.io

类 ArrayWritable

java.lang.Object

org.apache.hadoop.io.ArrayWritable

所有已实现的接口:

Writable

public class ArrayWritable
extends Object
implements Writable

A Writable for arrays containing instances of a class. The elements of this writable must all be instances of the same class. If this writable will be the input for a Reducer, you will need to create a subclass that sets the value to be of the proper type. For example: public class IntArrayWritable extends ArrayWritable { public IntArrayWritable() { super(IntWritable.class); } }

构造器概要

构造器

构造器和说明
ArrayWritable(Class<? extends Writable> valueClass)
ArrayWritable(Class<? extends Writable> valueClass, Writable[] values)
ArrayWritable(String[] strings)

方法概要

方法

限定符和类型	方法和说明
Writable[]	get()
Class	getValueClass()
void	readFields(DataInput in) Deserialize the fields of this object from in.
void	set(Writable[] values)
Object	toArray()
String[]	toStrings()
void	write(DataOutput out) Serialize the fields of this object to out.

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造器详细资料

ArrayWritable

public ArrayWritable(Class<? extends Writable> valueClass)

ArrayWritable

public ArrayWritable(Class<? extends Writable> valueClass,
             Writable[] values)

ArrayWritable

public ArrayWritable(String[] strings)

方法详细资料

getValueClass

public Class getValueClass()

toStrings

public String[] toStrings()

toArray

public Object toArray()

set

public void set(Writable[] values)

get

public Writable[] get()

readFields

public void readFields(DataInput in)
                throws IOException

从接口复制的说明: Writable

Deserialize the fields of this object from in.

For efficiency, implementations should attempt to re-use storage in the existing object where possible.

指定者:

readFields 在接口中 Writable

参数:

in - DataInput to deseriablize this object from.

抛出:

IOException

write

public void write(DataOutput out)
           throws IOException

从接口复制的说明: Writable

Serialize the fields of this object to out.

指定者:

write 在接口中 Writable

参数:

out - DataOuput to serialize this object into.

抛出:

IOException