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Performance-wise, yes, you can optimize it by going character-by-character through the input looking for / characters, such as below. …

Performance On my machine, this consistently runs marginally faster than @GentianKasa's code (3/4 of a second for k=8), assuming the same BigInteger-based framework for numbers. …

There may be a slight performance gain to be made if the two strings are frequently equal. …

Note that your performance testing is flawed. The problem is the VM performs internal optimizations as it runs which can improve the performance of the system. … Also pull the System.out.println() out of your method - it's an artificial drag on the performance. -- Working off of @rofl's other suggestion, this is 25% faster on my machine than your fast method, …

Performance You may see some performance gain by running each file download on its own thread. You'd need to take your existing code and move much of it into a Runnable or Callable. …

I had no problems using a SortedSet, which is both more clear and more efficient than your implementation. You should use Scanner#nextInt() instead of parsing strings yourself. I'm currently on a Ja …

Maximize readability until you have a known performance bottleneck. … * This is arguably a premature optimization, and may be a performance loss if the there are many * caterpillars and few leaves. */ Arrays.sort(caterpillars); …

The performance of LinkedList is often worse than ArrayList. You should consider testing their relative performances. You should code to interfaces, not implementations, where possible. … As far as optimizing performance, you'll have to do some testing and see if it's working fast enough for you. …

Streams should always be closed. You will have resource leaks if your method throws an exception. Either close the streams in a finally block, or use try-with-resources to make sure they get closed. O …

There’s a good chance this is a big performance sink because of how much reflection you’re doing. Rather than reflect on every instance of every object, just do the reflection work once. … It might affect performance in some trivial way, but you’re better off refactoring the code to be easier to read. …

Note that none of these suggestions will have any significant impact on the performance of your application overall. Don't micro-optimize performance until you have known, tested bottlenecks. …

Prefer assigning variables to the most generally applicable type. If it doesn't matter what kind of list you have, use List. If it doesn't matter what kind of map you have, use Map. Use whitespace con …

Code should not make micro-optimizations for performance reasons until there is a clearly tested bottleneck in the code. … First use repeatable performance testing to find actual performance bottlenecks, then fix them. Variables that are not intended to be reassigned should be marked as final. …

There are definitely performance optimizations out there. Do a search on codereview. Many will have you recreate the Cell class to track, for instance, the adjacent cells. Maybe start here? … Optimize Conway's Game of Life As always, you need to find the correct line between ease-of-comprehension and performance. Trust Knuth: premature optimizations are the root of all evil. …

Documentation The class shouldn't mention who the intended client is, just what it does. Most of your comments inside methods are noise. Document why, not what. Error Handling You don't handle bad inp …