学习日记 10 高新(2) 泛型
泛型是1.5版本以后出现新特性 好处: 1. 安全。 2 避免了强制转换麻烦。 泛型式：通过来定义要操作的引用数据类型。 泛型类定义的泛型，在整个类中有效, 就是用来接收类型的 以前用Object来完成扩展,现在定义泛型来完成扩展。 当使用集合时，将集合中要存储的
泛型是1.5版本以后出现新特性
好处:
1. 安全。
2 避免了强制转换麻烦。
泛型格式：通过来定义要操作的引用数据类型。
泛型类定义的泛型，在整个类中有效,
就是用来接收类型的
以前用Object来完成扩展,现在定义泛型来完成扩展。
当使用集合时，将集合中要存储的数据类型作为参数传递到中
泛型定义在接口上。
interface Inter
{
void show(T t);
}
迭代时 使用泛型
接受 String类型
Iterator
? 通配符 在不确定接受那种类型时
用通配符来表示
格式 : >
？ extends E: 接收E类型或者E的子类型,向上限定
？ super E: 接收E类型或者E的父类型,向下限定
泛型的静态使用特点:
静态方法不可以访问类上定义的泛型。
如果静态方法操作的应用数据类型不确定，可以将泛型定义在方法上。
例:
public static void fanxing(Collection extends Person> al)
表示 只能接受 Person 的类型或者 Person的子类
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