does usage of Scanner class in java effect the programs efficiency

general
1

i want to know why many of the coders in java doesnt use Scanner class
if it effects the efficiency , then which method is best for reading operation

2

Use BufferedReader

3

Scanner is very slow .
Even BufferedReader is not the fastest .
Read the java tutorial of codechef for details. - http://www.codechef.com/wiki/java - It is clearly mentioned over there.
Also follow this link - http://makeprogrammingyourforte.blogspot.in/2012/09/fastest-way-to-read-input-in-java.html
Hope this helps.

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