CODEWITHSUNDEEP
javaarraysobjectnullpointerexception
Stanton Programmer
Stanton Programmer

Reputation: 23

Null Pointer Exception when trying to add new object to array?

I have an array, moviearray, with logical size of 15 and physical size of 50. I have the following code:

    for(int a=0;a<moviearray.length;a++)
            {
                if (moviearray[a]!=null)
                    {
                        if(moviearray[a].getTitle()==catAddTitle.getText())
                        {
                            moviearray[a].addExisting(Integer.parseInt(catAddNumber.getText()));
                            break;
                        }
                    }   
                else
                {
                    moviearray[a].setTitle(catAddTitle.getText());
                    moviearray[a].setNumber(Integer.parseInt(catAddNumber.getText()));
                    moviearray[a].setGenre(catAddGenre.getText());
                    moviearray[a].setYear(Integer.parseInt(catAddYear.getText()));
                    moviearray[a].setRating(catAddRating.getSelectedItem());
                    moviearray[a].setPrice(Double.parseDouble(catAddPrice.getText()));
                    break;
                }
            }

I am trying to have it so where when I enter a movie title into catAddTitle (text field), and it matches a movie currently in moviearray, it will increase the movie's amount element by the number entered in the textfield catAddNumber. However, when I try doing this, it gives me a nullpointerexception on the line:

    moviearray[a].setTitle(catAddTitle.getText());

Example: one of my objects in the array has the elements "Hobbit/55/Adventure/2012/PG-13/10.00" (title, number, genre, year, rating, price). What should happen is that when I enter "Hobbit" into catAddTitle and "3" into catAddNumber, it should change the number to "58" (despite the other textfield data). Thanks in Advance

Upvotes: 0

Views: 99

Answers (2)

A4L
A4L

Reputation: 17595

In your else-branch - which is executed only if moviearray[a] == null - you need to do

moviearray[a] = new YourObject();

first, i.e. create an instance of your class and store it in the array.

Upvotes: 4

Nambi
Nambi

Reputation: 12042

You need to compare the String with equals() not with == Operator

change this line with

if(moviearray[a].getTitle()==catAddTitle.getText())

to

if(moviearray[a].getTitle().equals(catAddTitle.getText()))

Upvotes: 1

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