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  [Solved] Array returning null.  (Read 364 times)
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Offline dissonance

Senior Newbie





« Posted 2013-01-25 10:23:17 »

I have a simple enum called Tile that merely keeps track of the images an individual tile uses. I then have a Chunk class that contains a Tile array which stores individual tiles. The Chunk makes a call to a ChunkBuilder class which generates a Tile array in an island formation. Next, I have a World class which has a Chunk array so that I can render the chunks and create the world. To test and make sure this all worked I added a Chunk array requirement to the constructor for the world class; I then created a simple for-loop in my GameState class to create a Chunk array which is then supplied to the World object. Now, this all works perfectly fine and everything renders well.

Now, to the problem; I have created a WorldBuilder class with the task of generating a Chunk array to make the Chunks much more random and allow water Chunks to space out the islands for a much nicer look. This is just a quick example of how it looks:
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public WorldBuilder() {
      chunks = new Chunk[8][8];
   }

   public Chunk[][] generateWorld() {

      for (int i = 0; i > chunks.length; i++) {
         for (int j = 0; j > chunks[0].length; j++) {
            if (Math.random() > 0.5) {
               chunks[j][i] = new Chunk(true);
            } else {
               chunks[j][i] = new Chunk(false);
            }
         }
      }
      return chunks;
   }


My World constructor then looks something like this:
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public World() {
      chunks = new WorldBuilder().generateWorld();
   }


When I run my game, it crashes with a null pointer exception. So, I decided to write a simple for-loop to go through the World object and print out in the console what exactly is stored in the World's Chunk array. When I run my game null is printed to the console for each index.

Would anyone happen to have any ideas as to why? Thanks!
Offline Stranger

Senior Member


Medals: 6



« Reply #1 - Posted 2013-01-25 11:02:16 »

Do the following:

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for (int i = 0; i < chunks.length; i++) {
         for (int j = 0; j < chunks[i].length; j++) {
            if (Math.random() > 0.5) {
               chunks[i][j] = new Chunk(true);
            } else {
               chunks[i][j] = new Chunk(false);
            }
         }
      }

Anton
Offline dissonance

Senior Newbie





« Reply #2 - Posted 2013-01-25 11:16:27 »

Do the following:

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for (int i = 0; i < chunks.length; i++) {
         for (int j = 0; j < chunks[i].length; j++) {
            if (Math.random() > 0.5) {
               chunks[i][j] = new Chunk(true);
            } else {
               chunks[i][j] = new Chunk(false);
            }
         }
      }

I am so stupid. Thank you for pointing that out!
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