Random is the base class that provides convenient methods for generating pseudorandom numbers in various formats like integer, double, long, float, boolean and you can even generate an array of random bytes. util. 1- Math.random() This method will always return number between 0(inclusive) and 1(exclusive). random() is one of the methods among them that returns a positive double value within the range of 0.0 and 1.0 where 0.0 is inclusive and 1.0 is exclusive. The default random number always generated between 0 and 1. Scanner class and its function nextInt() is used to obtain the input, and println() function is used to print on the screen. random generates a random double number and uses Random class internally to do that. Let’s take a look at code examples. The java.lang.Math.random() is used to return a pseudorandom double type number greater than or equal to 0.0 and less than 1.0. Returns a pseudorandom, uniformly distributed int value between 0 (inclusive) and the specified value (exclusive), drawn from this random number generator's sequence. If you need a cryptographically secure random generator – use java. Java Math class offers a number of methods to work on calculations such as logarithms, average, exponentiation, etc. nextInt(int bound) returns an int type pseudo-random number, greater than or equal to zero and less than the bound value. Math. Random. ; Random class and its function is used to generates a random number. This Java program asks the user to provide maximum range, and generates a number within the range. In order to generate random array of integers in Java, we use the nextInt() method of the java.util.Random class. In software development and programming world, we often need to generate random numbers, sometimes random integers in a range e.g. Java Math.random() method . Method 1: Using Math class java.lang.Math class has a random() method which generates a decimal value of type double which is greater than 0.0 and less than 1.0(0.9999), that is in the range 0.0(inclusive) to 1.0(exclusive). Declaration − The java.util.Random.nextInt() method is declared as follows − public int … All n possible int values are produced with (approximately) equal probability. This value is different every time the method is invoked. The bound parameter specifies the range. 1 to 100, etc. In order to generate a number between 1 to 50, we multiply the value returned by Math.random() method by 50. Generating random numbers themselves have a good utility value and having them achieved by the usage of function can prove to be very useful. java. For example, if we specify the bound as 4, nextInt(4) will return an int type value, greater than or equal to zero and less than four. In the developer’s world, it is a common task to generate a random number, in a situation like where we need to send an OTP to a user for authentication or need to generate secure SALT which will be used in cryptography, etc. Math.random method; java.util.Random class; ThreadLocalRandom class; 1. The general contract of nextInt is that one int value in the specified range is pseudorandomly generated and returned. Math.random() Method. I will try to provide cons for different mechanism so that you can choose what is best for you. This returns the next random integer value from this random number generator sequence. SecureRandom. If you want to specific range of values, you have to multiply the returned value with the magnitude of the range. Thankfully, Random number generation in Java is easy as Java API provides good support for random numbers via java.util.Random class, Math.random() utility method, and recently ThreadLocalRandom class in Java 7, along with … security. 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