strip only the numbers from any formatted string of phone number

This is a method which returns a string contains numbers init.The phone numbers may contain in differnt formats Ex: (123) 456-7890
                                 123-456-7890
so we can read these type of characters and returns only the numbers using java method isDigit from Character class.

Display first fetter of a word with Capital letter in a given Sentence or String

The below code will display every first letter of a word in the sentence will display as a capital letter or in Camel Case using java program.

convert .pem file to .ppk using puttygen - AWS

PEM-Privacy Enhanced Mail is a Base64 encoded DER certificate file format.  PEM certificates are frequently used for web servers as they can easily be translated into readable data using a simple text editor.  Generally when a PEM encoded file is opened in a text editor, it contains very distinct headers and footers.

while creating an instance in Amazon EC2 you will be required to create Key Pairs and .pem file will be generated. I have shown in the below images how to convert .pem file to .ppk file format using puttygen in the below images.