Random in java

Question

Can someone explain me the random method

Answer 1

Math.random() or Random class?
https://docs.oracle.com/javase/8/docs/api/java/lang/Math.html#random--
https://docs.oracle.com/javase/8/docs/api/java/util/Random.html

Answer 2

Don't forget java.util.concurrent.ThreadLocalRandom
https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ThreadLocalRandom.html