All Superinterfaces:

Serializable

All Known Subinterfaces:

InputFormat, WritableComparable<T>

All Known Implementing Classes:

ArrayWritable, BaseInputFormat, BooleanWritable, BytesWritable, ByteWritable, Configuration, CSVInputFormat, DoubleWritable, FloatWritable, IntWritable, LibSvmInputFormat, LineInputFormat, ListStringInputFormat, LongWritable, MatlabInputFormat, NDArrayWritable, NullWritable, SVMLightInputFormat, Text
```
public interface Writable
extends Serializable
```

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`WritableType`	`getType()`	Get the type of the writable.
`void`	`readFields(DataInput in)`	Deserialize the fields of this object from `in`.
`double`	`toDouble()`	Convert Writable to double.
`float`	`toFloat()`	Convert Writable to float.
`int`	`toInt()`	Convert Writable to int.
`long`	`toLong()`	Convert Writable to long.
`void`	`write(DataOutput out)`	Serialize the fields of this object to `out`.
`void`	`writeType(DataOutput out)`	Write the type (a single short value) to the DataOutput.

- Method Detail
  - write
```
void write(DataOutput out)
    throws IOException
```
    Serialize the fields of this object to out.
    
    Parameters:
    
    out - DataOuput to serialize this object into.
    
    Throws:
    
    IOException
  - readFields
```
void readFields(DataInput in)
         throws IOException
```
    Deserialize the fields of this object from in.
    For efficiency, implementations should attempt to re-use storage in the existing object where possible.
    
    Parameters:
    
    in - DataInput to deseriablize this object from.
    
    Throws:
    
    IOException
  - writeType
```
void writeType(DataOutput out)
        throws IOException
```
    Write the type (a single short value) to the DataOutput. See WritableFactory for details.
    
    Parameters:
    
    out - DataOutput to write to
    
    Throws:
    
    IOException - For errors during writing
  - toDouble
```
double toDouble()
```
    Convert Writable to double. Whether this is supported depends on the specific writable.
  - toFloat
```
float toFloat()
```
    Convert Writable to float. Whether this is supported depends on the specific writable.
  - toInt
```
int toInt()
```
    Convert Writable to int. Whether this is supported depends on the specific writable.
  - toLong
```
long toLong()
```
    Convert Writable to long. Whether this is supported depends on the specific writable.
  - getType
```
WritableType getType()
```
    Get the type of the writable.
    
    Returns:

Interface Writable

Method Summary

Method Detail

write

readFields

writeType

toDouble

toFloat

toInt

toLong

getType