Generate a random double in a range

Question

I have two doubles like the following  double min   100  double max   101    and with a random generator  I need to create a double value between the range of min and max   Random r   new Random    r nextDouble      but there is nothing here where we can specify the range

User · Answer

To generate a random value between rangeMin and rangeMax   Random r   new Random    double randomValue   rangeMin    rangeMax - rangeMin    r nextDouble

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Use this   double start   400  double end   402  double random   new Random   nextDouble    double result   start    random    end - start    System out println result       EDIT   new Random   nextDouble    randomly generates a number between 0 and 1   start  start number  to shift number  to the right   end - start  interval  Random gives you from 0  to 100  of this number  because random gives you a number from 0 to 1     EDIT 2  Tks  daniel and  aaa bbb  My first answer was wrong

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Hope  this might help the best   Random Number Generators in Java  Sharing a Complete Program  import java util Random   public class SecondSplitExample       public static void main String   arguments                int minValue   20  maxValue 20000          Random theRandom   new Random            double theRandomValue   0 0                      Checking for a valid range-         if  Double valueOf maxValue - minValue  isInfinite      false                theRandomValue   minValue    maxValue - minValue    theRandom nextDouble                     System out println  quot Double Random Number between   quot   minValue   quot   quot   maxValue   quot      quot   theRandomValue            Here is the output of 3 runs  Code gt java SecondSplitExample Double Random Number between  20 20000    2808 2426532469476  Code gt java SecondSplitExample Double Random Number between  20 20000    1929 557668284786  Code gt java SecondSplitExample Double Random Number between  20 20000    13254 575289900251  Learn More   Top 4 ways to Generate Random Numbers In Java Random Docs

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import java util Random   public class MyClass        public static void main String args                Double min   0 0      Set To Your Desired Min Value           Double max   10 0     Set To Your Desired Max Value           double x    Math random       max - min    1     min       This Will Create A Random Number Inbetween Your Min And Max            double xrounded   Math round x   100 0    100 0       Creates Answer To The Nearest 100 th  You Can Modify This To Change How It Rounds            System out println xrounded         This Will Now Print Out The Rounded  Random Number

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This question was asked before Java 7 release but now  there is another possible way using Java 7  and above  API   double random   ThreadLocalRandom current   nextDouble min  max     nextDouble will return a pseudorandom double value between the minimum  inclusive  and the maximum  exclusive   The bounds are not necessarily int  and can be double

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The main idea of random is that it returns a pseudorandom value  There is no such thing as fully random functions  hence  2 Random instances using the same seed will return the same value in certain conditions   It is a good practice to first view the function doc in order to understand it   https   docs oracle com javase 8 docs api java util Random html   Now that we understand that the returned value of the function nextDouble   is a pseudorandom value between 0 0 and 1 0 we can use it to our advantage   For creating a random number between A and B givin  that the boundaries are valid  A B  we need to  1  find the range between A and B so we can know how to many  steps  we have  2  use the random function to determine how many steps to take  because the returned value is between 0 0 and 1 0 you can think of it as  pick a random percentage of increase  3  add the offset  After all of that  you can see that mob gave you the easiest and most common way to do so in my opinion  double randomValue   rangeMin    rangeMax - rangeMin    r nextDouble     double RandomValue   Offset    Range   randomVal between 0 0-1 0

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Random random   new Random    double percent   10 0    10 0  if  random nextDouble     100D  lt  percent          do

[java] Generate a random double in a range

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