D.9.2. Random-Number Repeatability for Testing and Debugging
Class Random’s methods actually generate pseudorandom numbers based on complex mathematical calculations—the sequence of numbers appears to be random. The calculation that produces the numbers uses the time of day as a seed value to change the sequence’s starting point. Each new Random object seeds itself with a value based on the computer system’s clock at the time the object is created, enabling each execution of a program to produce a different sequence of random numbers.
When debugging an application, it’s often useful to repeat the exact same sequence of pseudorandom numbers during each execution of the program. This repeatability enables you to prove that your application is working ...
Get Android™ How to Program, Second Edition now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
