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Linear data structures and multi threading

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I'm trying to write a program (in java) that pings each possible IP address on a sub net to see if its alive, and if it is, store it in a sorted linked list to be displayed in a JTable. As of right now I'm using the Thread class instead of the Runnable interface and I'm getting a lot of null pointer exceptions. Whenever I run this program without multi threading the program works fine. Ive done a bit of research and so far the material seems to be rather complex and above my understanding. I'm wondering if accessing the data structure from several threads is my issue, and if so, how do I get around this?

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