Java training #2

The Purpose of this training is to get familiar with:

• Strings and some of their methods and behaviors
• Basic work with Arrays

1. Get a sentence as an input from the user and print to the screen each word of the sentence in a different line
   
   
2. Get a sentence as an input and print the reversed sentence.
   Example:
   Input: hello world
   Output: world hello
   
   
3. Get a sentence as an input and print to the screen:
       The number of words in the sentence
       The number of times that the letter ‘a’ appears,
       The number of times that the letter ‘f’ exists
       The number of commas in the sentence
   
   
4. Get a sentence as an input and a number as an input. and do the following
   Example 1:
   Input: Hello world 3
   Output:
    hel
    lo
   wor
   ld
   
   Example 2:
   Input: taltaltal 3
   Output:
   tal
   tal
   tal

Note: In the examples above, the number 3 means => 3 letters will be print each time. space can be considered as letter  character.