![]() ![]() It also relies on the same logic to multiple random values to a given number to generate another random number in a given range. Implementation of this method is also self-explanatory. Our next method is getRandomInteger(int maximum, int minimum), which returns a random integer between a given range. That's why that little bracket is very important. Now if you multiply zero by any other number, you will get zero again. Since random() method always returns a value between 0 and 1, casting into an int will always produce a zero. If you remove the braces between Math.random()*max, you will always end up zero because Java will first cast the double value returned by random() method to int and then multiply it to a max. ![]() It's a straightforward code, but the tricky thing is type casting into the int. return (int) (Math.random()*max) //incorrect always return zero return ( int) ( Math. Our method getRandom(int max) returns a random value between 0 and a given number exclusive. In this program, we will learn how to generate a random number between 1 to 100, between 1000 to 9999 or any arbitrary minimum and maximum values. You can still calculate random number between 1 to 10 or between any number by using Math.random() method. If you are using Math.random() function and wondering that it can only return a random number between 0.0 and 1.0, you are wrong. ![]() How to generate Random numbers between 1 and 10 in Java If you are interested in learning more about ThreadLocalRandom and SecureRandom classes then I suggest reading Java Performance The Definitive Guide By Scott Oaks, he has covered them in good detail in a separate section. If security is your concern then you have another option in terms of SecureRandom, which provides a cryptographically strong random number generator. In a scalable environment, ThreadLocalRandom can improve performance significantly as it keeps the instance of a random number generator in a ThreadLocal variable to reduce contention. To solve this problem, JDK 1.7 introduces ThreadLocalRandom class, which allows each thread to keep its own pseudo-random number to reduce contention. Since Math.random() method is properly synchronized to ensure the correct value is returned when used by multiple threads, it also becomes a bottleneck when multiple threads simultaneously use it. you need random numbers between a range or multiple threads needs to generate random numbers simultaneously, then you should look other random solution available in Java. If your requirement is more sophisticated i.e. ![]()
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