WARNING 4! NPE when accessing index value of null array/collection Consider the following code written by a client of ChainSaw: ChainSaw myChainSaw = ChainSaw.initChainSaw(“QWE-T800”);ChainSaw[] friendsChainSaw = new ChainSaw[]{ ChainSaw.initChainSaw(“Q22-T450”), ChainSaw.initChainSaw(“QRT-T300”), ChainSaw.initChainSaw(“Q-T900”), null, // ops! ChainSaw.initChainSaw(“QMM-T850”), // model is not supported ChainSaw.initChainSaw(“ASR-T900”)};int score = myChainSaw.performance(friendsChainSaw); Creating an array of ChainSaw was quite challenging in this example. […]