I am new to Java and I need to solve an exercise that requires the following:
For a string that the user inputs, return the largest word (so far so good here)
But, it should take into account that numbers and symbols are not words.
For example: Hello, my name is Jonathan and my phone is 0123456789 should return "Jonathan" as longest word.
Example 2: H3llo W0rld, Java 1s fun!, should return "Java" as longest word.
In my pseudo-code I thought about the following:
A) Request input from user.
B) While input invalid, loop.
C) Scan the input
D) Separate the words by the spaces, or tokens.
E) If Word contains just letters A-Z && a-z do the following code:
e1) Check for longest word, with a for.
e2) Print result
F) else if: move to the next word.
Here is the code that I have so far. As you see, many parts are taken from here and adapted to the code. The "Find the longest in array" is a popular subject, yet I am not able to do the checking for the alphabetical characters. Any help will be welcomed.
The problem is that I don't know how to implement the part that checks for letters.
Code:
package longestword; import java.util.Scanner; public class LongestWord { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.print("Enter a String: "); //looping for non empty strings int largestLength = 0; String largestWord = ""; String userinput = sc.nextLine(); while (userinput.equals("")) { System.out.println("Please insert a String: "); userinput = sc.nextLine(); } for (String b : userinput.split(" ")) { if (largestWord.length() == 0) { largestLength = b.length(); largestWord = b; } else if (b.length() >= largestLength) { largestLength = b.length(); largestWord = b; } } sc.close(); System.out.println("Longest Word: " + largestWord); } public boolean isAlpha(String userinput) { char[] chars = userinput.toCharArray(); for (char c : chars) { if (!Character.isLetter(c)) { return false; } } return true; } } /* char c = '*'; if( (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')) System.out.println(c + " is an alphabet."); else System.out.println(c + " is not an alphabet."); } } */ 
isAlphamethod?