Getting random numbers in Java

Question

I would like to get a random value between 1 to 50 in Java   How may I do that with the help of Math random      How do I bound the values that Math random   returns

User · Answer

int max   50  int min   1    1  Using Math random    double random   Math random     49   1  or int random    int   Math random     50   1     This will give you value from 1 to 50 in case of int or 1 0  inclusive  to 50 0  exclusive  in case of double     Why       random   method returns a random   number between 0 0 and 0 9     you   multiply it by 50  so upper limit   becomes 0 0 to 49 999    when you add 1  it becomes 1 0 to 50 999     now when you truncate to int  you get 1 to 50   thanks to  rup in comments   leepoint s awesome write-up on both the approaches    2  Using Random class in Java   Random rand   new Random     int value   rand nextInt 50      This will give value from 0 to 49   For 1 to 50  rand nextInt  max - min    1    min   Source of some Java Random awesomeness

User · Answer

The first solution is to use the java util Random class   import java util Random   Random rand   new Random        Obtain a number between  0 - 49   int n   rand nextInt 50       Add 1 to the result to get a number from the required range     i e    1 - 50    n    1    Another solution is using Math random     double random   Math random     49   1    or  int random    int  Math random     50   1

[java] Getting random numbers in Java

1. Using Math.random()

2. Using Random class in Java.

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