These functions are used to serialize instances of the class, e.g. to
spill them to disk, hold them in byte arrays or send them over the network.

--sebastian

On 18.11.2013 16:26, Jyoti Yadav wrote:
> Hi  folks...
> 
> Would you please explain me in simple words--What is the use of following
> two functions in Writable.java class.
> 
> 1.   public void readFields(DataInput in)
> 2.    public void write(DataOutput out)
> 
> When we are going to write some custom class which is implementing
> Writable.java , then how we should deal with these two functions...??
> 
> Thanks
> Jyoti
> 

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