I have an integer array with 40 integer values and need to put these randomly on into another integer array. I have a random number that chooses a random value from the first array, but if that specific integer has already been chosen, it has to pick a new random value, but that last part seems to bug for som…
Tag: random
java- how to generate a 6 digit random hexadecimal value
I have a scenario in a Android app, where a random hexadecimal value has to be generated with 6 digits. (The range of values can be hexadecimal or integer values). What is the most efficient way to do this? Do I have to generate a random decimal number, and then convert it to hexadecimal? Or can a value be di…
Generating a random double in an exclusive range
I’m trying to generate a random floating point number between but not including it’s lower and upper bounds (lower, upper). I’ve seen a lot of questions about generating a number from, and including it’s lower bound up to, but not including it’s upper bound [lower, upper), but th…
Getting rid of FindBugs “Random object created and used only once” when Random is created in the constructor
I want to get rid of the FindBugs warning “DMI: Random object created and used only once”. In the following example, the random number is generated only once upon the object construction. In other terms, for the lifecycle of a single instance of the class Wrap, no other instances of java.util.Rand…
Generate a Secure Random Password in Java with Minimum Special Character Requirements
How do I create a random password that meets the system’s length and character set requirements in Java? I have to create a random password that is 10-14 characters long and has at least one uppercase, one lowercase, and one special character. Unfortunately, some special characters are too special and c…
How to chose a random point at a certain distance to a reference point
I have point A (pointA = (x1, y1)) and I need to choose a random point B (pointB = (x2, y2)) such that the distance between the A and B is equal to K. Answer Let’s solve in polar form. We’ll need these doubles distance, x1, and y1. First, we want the angle in radians: Then we want to get
Load random Image from a directory using javafx
How can I load a random image from a directory using javafx, (the files located in the directory have different names) Currently I am using the following to load a specific file Answer Thanks to Patrick I came up with a short version:
How can I shuffle the letters of a word?
What is the easiest way to shuffle the letters of a word which is in an array? I have some words in an array and I choose randomly a word but I also want to shuffle the letters of it. I am not supposed to use that List thing. I’ve come up with something like this but with this code
Pick a random value from an enum?
If I have an enum like this: What is the best way to pick one randomly? It doesn’t need to be production quality bulletproof, but a fairly even distribution would be nice. I could do something like this But is there a better way? I feel like this is something that’s been solved before. Answer The …
How to generate a random alpha-numeric string
I’ve been looking for a simple Java algorithm to generate a pseudo-random alpha-numeric string. In my situation it would be used as a unique session/key identifier that would “likely” be unique over 500K+ generation (my needs don’t really require anything much more sophisticated). Idea…