Thread: help with char

I'm having trouble figuring this out
this is assignment

Write a program using a while-loop (and a for-loop) that asks the user to enter a string, and then asks the user to enter a character. The program should count and display the number of times that the specified character appears in the string. (So, you will have two separate program codes, one using a while-loop and the other one using a for-loop.)

Example:
Enter a string: “Hello, JAVA is my favorite programming language.”
Enter a character: e
The number of times the specified character appears in the string: 3

I don't even know where to begin Ive only got this

import java.util.Scanner;
 
public class letterCounter {
 
public static void main(String [] args) {
 
	Scanner sc = new Scanner(System.in);
 
	System.out.println("Enter a string");
	String myString = sc.nextLine();
 
	System.out.println("Enter a letter");
	String letter = sc.nextLine();
	}
}

help please