Ivan Zhang’s Java Code:


Input any amount of values.


package newpackage;


import java.util.ArrayList;
import java.util.Collections;
import java.util.Scanner;


public class Homeworkdevelopment 
{
        public static void main(String[] args)
        {
                @SuppressWarnings("resource")
                Scanner input = new Scanner(System.in);
                System.out.print("Please input a String: ");   
                String userinput = input.nextLine();
                if (userinput.equals(""))
                {
                        System.out.println("Empty List");
                        System.exit(0);
                        return;
                }
                char[] inputarray = userinput.toCharArray();  
                String[] inputstringarray = userinput.split("");
                ArrayList<String> numbers = new ArrayList<String>();
                ArrayList<String> lettersup = new ArrayList<String>();
                ArrayList<String> letterslow = new ArrayList<String>();
                ArrayList<String> characters = new ArrayList<String>();
                for (int i = userinput.length(); i > 0; i--)
                {
                        if ((int)inputarray[i-1] >= 48 && (int)inputarray[i-1] <= 57)
                        {
                                numbers.add(inputstringarray[i-1]);
                        }
                        else if ((int)inputarray[i-1] >= 65 && (int)inputarray[i-1] <= 90)
                        {
                                lettersup.add(inputstringarray[i-1]);
                        }
                        else if ((int)inputarray[i-1] >= 97 && (int)inputarray[i-1] <= 122)
                        {
                                letterslow.add(inputstringarray[i-1]);
                        }
                        else
                        {
                                characters.add(inputstringarray[i-1]);
                        }
                }
                Collections.sort(numbers);
                Collections.sort(lettersup);
                Collections.sort(letterslow);
                Collections.sort(characters);
                StringBuilder changeletterslow = new StringBuilder(letterslow.toString());
                StringBuilder newletterslow = changeletterslow.deleteCharAt(changeletterslow.length()-1);
                StringBuilder changelettersup = new StringBuilder(lettersup.toString());
                StringBuilder newlettersup = changelettersup.deleteCharAt(0);
                System.out.println(numbers.toString());
                System.out.println(newletterslow.toString() + ", " + newlettersup.toString());
                System.out.println(characters.toString());
        }
}