How do I generate a random integer between min and max in Java

Question

What method returns a random int between a min and max  Or does no such method exist   What I m looking for is something like this    NAMEOFMETHOD  min  max      where min and max are ints   that returns something like this    8    randomly    If such a method does exist could you please link to the relevant documentation with your answer   Thanks      UPDATE  Attempting to implement the full solution and I get the following error message    class TestR       public static void main  String  arg                    Random random   new Random             int randomNumber   random nextInt 5    2          System out println  randomNumber                 I m still getting the same errors from the compiler    TestR java 5  cannot find symbol symbol    class Random location  class TestR         Random random   new Random               TestR java 5  cannot find symbol symbol    class Random location  class TestR         Random random   new Random                                   TestR java 6  operator   cannot be applied to Random nextInt int         int randomNumber   random nextInt 5    2                                             TestR java 6  incompatible types found      lt nulltype gt  required  int         int randomNumber   random nextInt 5    2                                                 4 errors    What s going wrong here

User · Answer

Using the Random class is the way to go as suggested in the accepted answer  but here is a less straight-forward correct way of doing it if you didn t want to create a new Random object     min    int   Math random      max - min   1

User · Answer

With Java 7 or above you could use  ThreadLocalRandom current   nextInt int origin  int bound    Javadoc  ThreadLocalRandom nextInt

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Construct a Random object at application startup   Random random   new Random      Then use Random nextInt int    int randomNumber   random nextInt max   1 - min    min    Note that the both lower and upper limits are inclusive

User · Answer

You can use Random nextInt n   This returns a random int in  0 n   Just using max-min 1 in place of n and adding min to the answer will give a value in the desired range

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This generates a random integer of size psize  public static Integer getRandom Integer pSize         if pSize lt  0            return null            Double min d   Math pow 10  pSize doubleValue  -1D       Double max d    Math pow 10   pSize  doubleValue    -1D      int min   min d intValue        int max   max d intValue        return RAND nextInt max-min    min

User · Answer

import java util Random

User · Answer

As the solutions above do not consider the possible overflow of doing max-min when min is negative  here another solution  similar to the one of kerouac   public static int getRandom int min  int max        if  min  gt  max            throw new IllegalArgumentException  Min     min     greater than max     max                   return  int     long  min   Math random       long max - min   1        this works even if you call it with   getRandom Integer MIN VALUE  Integer MAX VALUE

User · Answer

public static int random int int Min  int Max         return  int   Math random    Max-Min   Min     random int 5  9      For example

[java] How do I generate a random integer between min and max in Java?

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