Generating a Random Number between 1 and 10 Java

Question

I want to generate a number between 1 and 10 in Java   Here is what I tried   Random rn   new Random    int answer   rn nextInt 10    1    Is there a way to tell what to put in the parenthesis    when calling the nextInt method and what to add

User · Answer

The standard way to do this is as follows:

Provide:

min Minimum value
max Maximum value

and get in return a Integer between min and max, inclusive.

Random rand = new Random();

// nextInt as provided by Random is exclusive of the top value so you need to add 1 

int randomNum = rand.nextInt((max - min) + 1) + min;

See the relevant JavaDoc.

As explained by Aurund, Random objects created within a short time of each other will tend to produce similar output, so it would be a good idea to keep the created Random object as a field, rather than in a method.

User · Answer

As the documentation says  this method call returns  a pseudorandom  uniformly distributed int value between 0  inclusive  and the specified value  exclusive    This means that you will get numbers from 0 to 9 in your case  So you ve done everything correctly by adding one to that number   Generally speaking  if you need to generate numbers from min to max  including both   you write  random nextInt max - min   1    min

User · Answer

This will work for generating a number 1 - 10  Make sure you import Random at the top of your code   import java util Random    If you want to test it out try something like this   Random rn   new Random     for int i  0  i  lt  100  i          int answer   rn nextInt 10    1      System out println answer       Also if you change the number in parenthesis it will create a random number from 0 to that number -1  unless you add one of course like you have then it will be from 1 to the number you ve entered

[java] Generating a Random Number between 1 and 10 Java

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