Pyramid of doom (programming): Difference between revisions

Revision as of 16:25, 10 April 2016

Revision as of 16:26, 10 April 2016

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This code first looks in the arraycollection of windows for a window with the name "Main", gets the 5th subview within it, then calls the <code>size</code> method to return a structure with the view's dimensions, and finally calls the <code>width</code> method on that structure to produce a result that is assigned to <code>theWidth</code>.

The problem with this approach is that the code assumes that all of these values exist. While it is reasonable to expect that a window will have a size and that size will have a width, it is not at all reasonable to assume that a window named "Main" will exist, nor that it has five subviews. If either of those possibilities are true, one of the methods will be invoked on null, producing a null pointer error.