Map、Set、List初始化大小的影响

import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

public class Test
{

public static void main(String[] args)
{
testHashMap(16);
testHashMap(5000000);
System.out.println("----------------");
testHashSet(16);
testHashSet(5000000);
System.out.println("----------------");
testArrayList(16);
testArrayList(5000000);
}

public static void testHashMap(int initSize)
{
Map<Integer, String> map = new HashMap<Integer, String>(initSize);

long beginTime = System.currentTimeMillis();
for (int i = 0; i < 5000000; i++)
{
map.put(i, "hellooiuytrewq");
}
long endTime = System.currentTimeMillis();
System.out.println(endTime - beginTime);
}

public static void testHashSet(int initSize)
{
Set<Integer> set = new HashSet<Integer>(initSize);

long beginTime = System.currentTimeMillis();
for (int i = 0; i < 5000000; i++)
{
set.add(i);
}
long endTime = System.currentTimeMillis();
System.out.println(endTime - beginTime);
}

public static void testArrayList(int initSize)
{
List<Integer> list = new ArrayList<Integer>(initSize);

long beginTime = System.currentTimeMillis();
for (int i = 0; i < 5000000; i++)
{
list.add(i);
}
long endTime = System.currentTimeMillis();
System.out.println(endTime - beginTime);
}

}