Java for loop explanation

Question

I would appreciate some help on this code which I found inside a program but I could not understand it, I have guessed what it does by commenting it, but please correct me if I am wrong.

 for(String[] movieArray:movie)
        {
            for(String data:movieArray)
            {
                if(data!=null){ //If data is not empty then it writes...
                jTextArea1.append(data+", "); //...this to the textarea.
                }
                else{ //If data is empty, then it will stop.
                empty=true;
                break;
                }
            }
            if(empty==false){ //??
            jTextArea1.append("\n"); 
            }
        }
    }                                            

Answer 1

After all the elements in the array movieArray were not null, then they would be appended to jTextArea1 and the empty would stay false(provided it was false initially).

And after the inner for is over, it appends a new line character(\n) if empty was false(this would happen if the condition in the first statement satisfied), else if the empty was set to true(there was a null element in the array), then it would not print the new line character.

Here is how you can better understand it with an example.

movie = {{"1", "2", "3"}, {"4", "5", "6"}}; // Example 1

jTextArea1 would be

1, 2, 3, 
4, 5, 6,

And if

movie = {{"1", null, "3"}, {"4", "5", "6"}}; // Example 2

jTextArea1 would be

1, 4, 5, 6,

That's because in the second case, one of the elements of the array was null and thus it broke out of the for after setting empty as true. And since empty was true, it did not print the new line character.