How to analyze the String input??

Question

The program should accept integers but not the sentences for example
the user enters "Hi how are you"
the program should say"Sorry, please enter the integers"
if the user enters "123454545"
the program should work normally
The main aim is to differentiate between sentences and integers

Answer 1

You can use Exception handling to do this
for example
   String userInput;
   int number;
   try
       number = Integer.parseInt(userInput);
   catch(NumberFormatException nex)
      System.err.println("please enter integer");
   }