Hi, I am trying to use Random Int as customers and setting duration from 0 to 160. But it always show there are 159 people are waiting(seems use the...

Hi, I am trying to use Random Int as customers and setting duration from 0 to 160. But it always show there are 159 people are waiting(seems use the duration time). Hope someone can help me.

I have 2 class.

//First one.

import java.util.Random;

public class Customer {