• Advertisement

Archived

This topic is now archived and is closed to further replies.

[java] Newbie is stuck! Help!

This topic is 6323 days old which is more than the 365 day threshold we allow for new replies. Please post a new topic.

If you intended to correct an error in the post then please contact us.

Recommended Posts

How can I make an array of Buttons, or any other objects? I have this line Button [][] b=new Button[size][size]; and at run-time I get the error NullPointerException when I try to access the member functions. What`s wrong?

Share this post


Link to post
Share on other sites
Advertisement
you have not defined the objects that you created they all have no value (null) which is illegal in java.

I wish there was a button on my monitor to turn up the intellegince.
Theres a button called 'brightness' but it doesn't work

Share this post


Link to post
Share on other sites

When you define an array you build the array object (not strictly true, but anyway) but don''t initialize the elements (the object inside the array). You need to construct the elements before you can reference them (ie b[x][y] = new button())..

Share this post


Link to post
Share on other sites
This might help ...


Button [][] b = new Button[size][size];
for(int x = 0; x < size; x++)
for(int y = 0; y < size; y++)
b[x][y] = new Button();




Edited by - Hodglim on September 29, 2000 11:47:08 AM

Share this post


Link to post
Share on other sites

  • Advertisement