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I'm afraid there is a lot of magic going on here.

for (int count = 0; count < String1.length(); count++)
String1.charAt(count);
vs

for(int count = 0; count < aString.length(); count++)
DisplayLetter(aString.charAt(count));

Why did...

Execute this code and see what is printed out:


String aString = "bubble";
for(int count = 0; count < aString.length(); count++) {
System.out.println(count + " " +...

For the next lines of code I need to see: The DisplayLetter method.

This is painful. Do I have to ask you for the source line by line?
You don't show what the value of aString is or the complete output from your program.

What did you try? I don't see any code.

Replace the ? with count

That's an interesting construction of a statement.
Your previous post was almost there, you just had to put the loop index into the method call.
Now what have you done?
What does the API doc for...

In the code for a loop that you posted, what variable is going to start at 0 and increment by one every time thru the loop?

Does the code you posted compile? length is a method not a variable in...