add的用法，为何要循环加进同样的对象呢？》

import java.util.*;
class V2Radiator
{
    V2Radiator(ArrayList<SimUnit> list)
    {
        for(int x = 0; x < 5; x++)
        {
            list.add(new SimUnit("V2Radiator"));   这个add是把括号内的对象加进数组里，为什么要循环5次加入同样的对象呢？
        }
    }
}
class V3Radiator extends V2Radiator
{
    V3Radiator(ArrayList lglist)
    {
        super(lglist);
        for(int g = 0; g < 10; g++)
        {
            lglist.add(new SimUnit("V3Radiator"));
        }
    }
}
class RetentionBot
{
    RetentionBot(ArrayList rlist)
    {
        rlist.add(new SimUnit("RetentionBot"));
    }
}
public class TestLifeSupportSim
{
    public static void main(String[] args)
    {
        ArrayList aList = new ArrayList();
        V2Radiator v2 = new V2Radiator(aList);
        V3Radiator v3 = new V3Radiator(aList);
        for(int z = 0; z < 20; z++)
        {
            RetentionBot ret = new RetentionBot(aList);
        }
    }
}
class SimUnit
{
    String botType;
    SimUnit(String type)
    {
        botType = type;
    }
    int powerUse()
    {
        if("Retention".equals(botType))
        {
            return 2;
        }
        else
        {
            return 4;
        }
    }
}