Random integers between two values (a range) in java

Refer to : http://mycodedock.blogspot.in/2013/11/random-integers-in-java.html

Before we go to it, look at the code below. It generates 100 random numbers between 0 and 50 using randomObject.nextInt(int x) function.



Note that the the range of numbers generated is inclusive of 0 but exclusive of 50 (upper limit).

Now, let us modify this program to generate random numbers between two values. What if we want to generate numbers between two ranges? Let us say range is from 100 to 1000.

We will use something like x = MINVAL + RandomObj.nextInt(MAXVAL - MINVAL)

Analyze this code:



Note that all numbers are between 100(inclusive) and 1000(exclusive). This is pretty much what we wished to achieve.

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Random integers in java

java.util.Random provides randomObject.nextInt() function to generate random integers. Lets explore how this can be used.

Example to generate 100 random integers and print them:


Note that in java integers are 32 bits long. Which means we can have 2³² integers. Hence, we have 4294967296 integers which range from -2147483648 to +2147483647 (including 0).

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