While working on our integration product we had this requirement of assigning a random value to one of the entity properties. This is a very common requirement and this can be easily achieved using the methods available in the system defined class name “Math”. Not just this you can even specify the length for the random number you would like to generate. Here is small snippet that demonstrate this functionality

Here is the output of number it generated:

Math class contains methods  for mathematical operations and you can explore the other utility functionality it provides here,  https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_methods_system_math.htm

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