如何使用函数在Java中按字母顺序排列字符串

import java.util.Scanner;

public class alphabetical {

    public static void main(String[] args) {
    // TODO Auto-generated method stub
    Scanner Alphabet= new Scanner(System.in);
    System.out.println("Input First Name");
    String UserInput= Alphabet.next();
    System.out.println("Input second name");
    String UserInput2= Alphabet.next();
    System.out.println("Input third name");
    String UserInput3= Alphabet.next();
    System.out.println(alpha)UserInput,UserInput2,UserInput3));
}

    public static void alpha(String fromUser,String fromUser2, String fromUser3)
    {
    if (fromUser.compareTo(fromUser2)>0)
    {
        System.out.println(fromUser2);
    }
    else if(fromUser.compareTo(fromUser3)>0)
    {
        System.out.println(fromUser3);
    }
    else if (fromUser2.compareTo(fromUser3)>0)
    {
        System.out.println(fromUser3);
    }
    else if (fromUser2.compareTo(fromUser)>0)
    {
        System.out.println(fromUser);
    }
    else if (fromUser3.compareTo(fromUser)>0)
    {
        System.out.println(fromUser);
    }
    else if (fromUser3.compareTo(fromUser2)>0)
    {
        System.out.println(fromUser2);
    }

}
import java.util.Scanner;

public class alphabe