Question

Can someone give me a detailed explanation as to what  

Random generator = new Random();

Thread.sleep(generator.nextInt(1001)); does in java?

Answer 1

Random generator = new Random();

Thread.sleep(generator.nextInt(1001));

1) Random generator = new Random();

This statement creates an instance of random class to generate a random number .
Random generator can only be generated using the object of random class.

The object created here is "generator".

2) Thread.sleep(generator.nextInt(1001));

Here, generator.nextInt(1001) produces a random integer between 0 and 1001.

Thread.sleep() - This function is used to pause the execution of the current thread.

Threads are used to run multiple processes at the same time.

Say for example we have a loop to print 0 to 10000. and a loop to print hello thousand times.

We can run these tasks parallel to each other using threads or we can pause one task for a certain time and execute the other thread.

Thread.sleep(time) - time is the parameter required to specify the amount of time the thread must be paused for.

In the above case, it will be a random milli-second between 0 to 1001 - generated by the random function above.

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