Help with, String, Char

Hi, i am writing a program for my class and is what it has to do is take a string input from the user and then it has to output the length of the string and how many vowels are in the string.
I have tried everything i can think of, but i need help. I keep getting unexpected type error on all of my if statements I think it is because of what I am trying to compare, but I just don't know any other way to do it. All i need is a little help or point me in the right direction.

Code:

---

import java.util.*;
 
public class Assignment6 {
   
    public static void main(String[] args) {
           
            String a;
            int i, j, x;
            j = 0;
            x = 0;

            Scanner scannerKeyboard = new Scanner(System.in);
            System.out.println("Please enter a sentance: ");
           
            a = scannerKeyboard.nextLine();
            a.toUpperCase();
           
           
            for (i = 0; i <= 100; i++){
           
                   
                    if (a.charAt(i) = (char)65)
                            j++;
                           
                            else if (a.charAt(i) = (char)69)
                                    j++;
                                   
                                    else if (a.charAt(i) = (char)73)
                                            j++;
                                   
                                            else if (a.charAt(i) = (char)79)
                                                    j++;
                                   
                                                    else if (a.charAt(i) = (char)85)
                                                            j++;
                           
                    else
                            x++;
                   
                    }
                   
                    System.out.println("The length of the string entered is " + a.length());
                    System.out.println("The string you entered has this amount of vowels: " + j);
                    System.out.println("It also has this amount of whitespace and consanants: " + x);
       
    }
}

---

Thanks

why are using "=" in a condition statement............u must be using "=="....
i guess this might solve yr problem.