9/27/2023 0 Comments Java for loop randomQUICK ANSWER: Thanks everyone for help! So as farest I understood from your answers: this is not a bad practice! However in some cases(like life saving apps or bigger performance burden) keeping track of valid values instead of randomly generating at the cost of the code simplicity is justified and could be a better solution. So to repeat my question: Is there any principle of good coding practices that should prevent me from such a solution? I want the code to not only work but also be a quality code. The empty fields are represented by 0 and 3 walls are represented by 1's. One example of output: 0 0 0 0 1 0 0 0 0 0 TextualMatrix = textualMatrix + matrix + " " The code has no troubles with performance whenever I tried it and loops aren't repeated often but my exact question is: IS IT A BAD PRACTICE as there is no 100% sure way out of the loop and could potentially infinitely repeat itself(if we are very very unlucky) public class App else if (matrix = 0 & matrix = 0 I am on the stage of planning but for the sake of clarity I wrote the piece of code depicting what exactly my issue is. It seems easier to just generate a number and check if it's valid. Instead of having 4 lines of code to generate and check random number I would need 30-40 lines and declaring some new variables(probably arrays) to keep track of valid and invalid values. Someone could call them "over-engineering". There are work-around's that problem that doesn't require me to use loops but they would make that part of my code much more confusing. So is it a bad practice despite probabilities being mostly insignificant? Theoretically I should get the proper number within just a few repetitions(there is only 0,5^10 = 0,1% chance that the program will fail to do that within 10 repetitions) however it is still binding my program's performance to random number. However, I am thinking if it is a good practice. However about 50% of these numbers won't be valid(which numbers are valid will be dependent on previous parts of my code) so my initial idea was to generate random numbers inside a while-loop until proper number is generated. SecureRandom sRand = SecureRandom.One functionality of the program I am writing requires me to generate random numbers. Please note that all the above-discussed methods ( ints(), longs(), doubles() and their overloads) also work with the SecureRandom class. Int randInRange = secureRandomGenerator.nextInt(999999) SecureRandomGenerator.nextBytes(randomBytes) SecureRandom secureRandomGenerator = SecureRandom.getInstanceStrong() It might be a hardware random number generator or possibly some unpredictable system process, such as the timings events, interrupts etc. The default constructor also uses this algorithm.ĬSPRNG (cryptographically strong pseudo-random number generator) uses entropy, which is nothing but an unpredictable input (true random source). By default, SecureRandom uses the SHA1PRNG algorithm. cryptographically strong random number), use the subclass SecureRandom. To get the stream of secure random numbers (i.e. Random random = new Random() ĭoubleStream doubleStream = random.doubles(5, 0, 0.5) ĭoubleStream.forEach(System.out::println) Let’s learn to use the above-discussed methods to create a stream of random numbers.
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