Java generates different random numbers

By accident, it was found that using hashset in Java to generate different random numbers is the easiest way.

/*
* Use hashset to generate different random numbers. Requirement: generate 30 different random numbers between 0 and 50.
**/

Import java. util. hashset;
Import java. util. Random;
Import java. util. Set;

Public class randomtest
{
Public static void main (string [] ARGs)
{
Random random = new random (47 );

Set <integer> sets = new hashset <integer> ();

While (sets. Size () <30)
{
Int result = random. nextint (50 );

Sets. Add (result );

}

System. Out. println (sets );
}
}