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If an exception occurs because out of bounds values have been passed to a private method, that's either a bug or a lack of bounds checking in the calling method. https://www.youtube.com/watch?v=xUWuZjadbbQ, Source code for WeightedQuickUnionUF: http://algs4.cs.princeton.edu/15uf/WeightedQuickUnionUF.java.html, [1] Reference: https://www.cs.princeton.edu/courses/archive/fall15/cos226/assignments/percolation.html. Wastefull: You will make two aray accesses every time. Attributes and other variables start with lowercase and camel-caps for the rest of the name. from §2.4 Case Study: Percolation. At least the multi bound-checking before it must go. Maintain a byte array where the i th element stores data of the i th node/site in the WeightedQuickUnionUF object. Assertions must be put in place, not grouped in a method. In general, invariance checking is not checking that stuff that are final ever change, it is that some construct emerging from changing variables, still holds. How to solve this puzzle of Martin Gardner? Keystrokes don't count, readability matters! 21 2 2 bronze badges. There should be no need to do bounds checking in private methods since you have control over the calls made to it. I am teaching myself to program by working my way through David Eck's Javanotes. GitHub Gist: instantly share code, notes, and snippets. "A full site is an open site that can be connected to an open site in the top row via a chain of neighboring (left, right, up, down) open sites [1]". Hey, friends. add a comment | 2 Answers Active Oldest Votes. confusing: It opens the possibility of having a cell be full, but NOT open. In general no need to check final variables non-nullity for invariance. In your case, the gaps can only open. Bounds checking should be done in methods that are part of the class API, that is, any method that can be called by someone else and you have no way of controlling the validity of the values being passed in. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. I am teaching myself to program by working my way through David Eck's Javanotes. I strongly encourage you to do something similar. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. Junilu Lacar wrote:You probably tried to just reference N directly, right? I think it can still be considered a pathfinding problem. How to sustain this sedentary hunter-gatherer society? I don't immediately see any invariant worth checking. Did you try perc.N? If it isn't, then you'd have a bug. Percolation.java. Good reflex, but don't overdo it. Thanks for contributing an answer to Code Review Stack Exchange! There is an. When they will be disabled (no one bothers enabling it) they cost nothing, but the empty method call becomes useless. Why did MacOS Classic choose the colon as a path separator? There should be no need to do bounds checking in private methods since you have control over the calls made to it. It doesn't take much to make it unionFind. Why is it easier to carry a person while spinning than not spinning? I read the specification list from coursera and I don't understand your isFull() method. There's no "convenience" gained in writing 'getN()' vs. just 'N' or 'getGridSize()' vs just 'gridSize', if you follow my previous advice. Something like... if ( hasOpenNeighbor(row, column) ) Below is the syntax highlighted version of Percolation.java from §2.4 Case Study: Percolation. You can get rid of the virtual sites altogether. Where should small utility programs store their preferences?

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