using
System.Collections;
public
class
TestStudent
{
public
static
void
main(String args [])
{
//创建ArrayList对象
ArrayList students =
new
ArrayList();
//实例化几个Student类对象
Student rose =
new
Student(
"rose"
,25,
"reading"
);
Student jack =
new
Student(
"jack"
,28,
"singing"
);
Student mimi =
new
Student(
"mimi"
,26,
"dancing"
);
//利用ArrayList类的add()方法添加元素
students.add(rose);
students.add(jack);
students.add(mimi);
//利用ArrayList的Count属性查看该集合中的元素数量
int
number = students.Count;
Console.WriteLine(
"共有元素"
+ number +
"个"
);
//读取单个元素,由于存入ArrayList中的元素会变为Object类型,
//因此，在读取时间，
Student stu = students[0]
as
Student;
stu.say();
//遍历元素 -- 经过索引
for
(
int
i = 0;i < students.Count;i ++)
{
Student a = students[i]
as
Student;
a.say();
}
//利用foreach循环
foreach
(Object o
in
students)
{
Student b = o
as
Student;
b.say();
}
//删除元素 经过索引删除
students.removeAt(0);
//删除元素, 经过对象名
students.remove(jack);
//清空元素
students.Clear();
//咱们知道，ArrayList的容量会随着咱们的须要自动按照必定规律
//进行填充,当咱们肯定再也不添加元素时，咱们要释放多余的空间
//这就用到了Capacity属性和TrimtoSize()方法
//利用Capacity属性能够查看当前集合的容量
//利用TrimtoSize()方法能够释放多余的空间
//查看当前容量
int
number = students.Capacity;
//去除多余的容量
students.TrimtoSize();
}
}