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Sorry, I don't feel like going through your assignment. Your teacher must expect you to be able to understand it. If not, go ask him about the parts you don't understand.

Who suggested you use a class with no documentation?

If you don't have any documentation on how to use the LEDFont class it will be VERY DIFFICULT to use it.
You must have documentation.

That doesn't make any difference. You still need to know how to use its methods.
Is getLetter() a method in the LEDFont class?

What is LEDFont? A class or a reference/pointer to an instance of a class?
For example:
AClass aClsRef = new AClass(); // create instance of a class and save its address
AClass is a class....

The way you invoke a method of a class is to get a reference to that class and append to it the method separated by a . (dot):
aClassRef.theMethod(theargs);

Sort of.
Is this a merge of the contents of one array into another or is the complete replacement of one array be another?
For example if letter is [2][4] and matrix is [30][50] then it would be...

Please describe what you want the code to do. Your example methods are full of errors.
For example a method named get... should return something.
The letter array in getLetter() will go away when...

Ok. Let's see what happens tomorrow.

Look at this code example:


public class TestCode4 {
int theVar = 4; // the class variable that will be shadowed in method1

public void method1() {
int theVar = 55; // define a...

Show me the line of code you are talking about.

Its a simple case of removing the <data type> from the assignment statement in the main() method to make it only an assignment and not a definition and assignment.

public LEDDisplay()
{
super();
boolean[][] matrix = new boolean ...
Here you have defined a new variable in addition and shadowing the global one. You have two variables named matrix. The...

I suspect the error is occuring on this line:

if (matrix[j][i])
because the variable matrix has not been set to any value because of the problem I showed in post #4

Your IDE doesn't seem to...

Then your IDE does not work with a valid java program.
It is very,very unusual for an error to occur on line 2 of a java program.
Usually the first line is the class statement (and that excludes...

One problem you have is that you have two variables named matrix at different scopes.
The variable at the inner scope hides the outer one,so the outer one does not get set to a value.

When you...