первая лаба Java

package com.company;

import java.util.InputMismatchException;
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
    System.out.print("Please enter a number of strings what do you want to enter : ");

    Scanner in = new Scanner(System.in);
    int n =  0;
    try
    {
        n = in.nextInt();
    }
    catch (InputMismatchException ex)
    {
        System.err.print("Error! Please enter a digit!");
        System.exit(1);
    }

    if(n<=0)
    {
        System.err.println("Error! Please enter a positive digit");
        System.exit(2);
    }

    String [] s = new String[n];
    System.out.printf("Please enter string :\n");

    double middleLength = 0;

    for(int i = 0; i < n; ++i) middleLength+= (s[i] = in.next()).length();

    middleLength/=n;

    for (String x : s) if (x.length() < middleLength) System.out.printf("String : %s Length = %d \n ",x,x.length());
    }
}