Java-pay attention to the use of the random number-random class

The Java random class can be used to generate random numbers, but do not use the new random Class Object every time, because this class uses the current system time as the seed to generate random numbers, if new is used every time (especially in a loop, the interval is very short), the random numbers generated may be the same or very similar!

For example:

Do not write as follows:

For (INT I = 0; I <100; I ++ ){

System. Out. println (new random (). nextint ());

}

Write as follows:

Private Static random OBJ = new random ();

For (INT I = 0; I <100; I ++ ){

System. Out. println (obj. nextint ());

}