Java基础---泛型

1、为什么要有泛型

2、在集合中使用泛型

3、自定义泛型结构

自定义泛型结构：泛型类、泛型接口

泛型类

泛型方法

4、泛型在继承上的体现

5、通配符的使用

注意点

有限制的通配符

6、泛型应用举例：泛型嵌套

interface Info{		// 只有此接口的子类才是表示人的信息
}
class Contact implements Info{	// 表示联系方式
	private String address ;	// 联系地址
	private String telephone ;	// 联系方式
	private String zipcode ;	// 邮政编码
	public Contact(String address,String telephone,String zipcode){
		this.address = address;
		this.telephone = telephone;
		this.zipcode = zipcode;
	}
	public void setAddress(String address){
		this.address = address ;
	}
	public void setTelephone(String telephone){
		this.telephone = telephone ;
	}
	public void setZipcode(String zipcode){
		this.zipcode = zipcode;
	}
	public String getAddress(){
		return this.address ;
	}
	public String getTelephone(){
		return this.telephone ;
	}
	public String getZipcode(){
		return this.zipcode;
	}
	@Override
	public String toString() {
		return "Contact [address=" + address + ", telephone=" + telephone
				+ ", zipcode=" + zipcode + "]";
	}
}
class Introduction implements Info{
	private String name ;		// 姓名
	private String sex ;		// 性别
	private int age ;			// 年龄
	public Introduction(String name,String sex,int age){
		this.name = name;
		this.sex = sex;
		this.age = age;
	}
	public void setName(String name){
		this.name = name ;
	}
	public void setSex(String sex){
		this.sex = sex ;
	}
	public void setAge(int age){
		this.age = age ;
	}
	public String getName(){
		return this.name ;
	}
	public String getSex(){
		return this.sex ;
	}
	public int getAge(){
		return this.age ;
	}
	@Override
	public String toString() {
		return "Introduction [name=" + name + ", sex=" + sex + ", age=" + age
				+ "]";
	}
}
class Person<T extends Info>{
	private T info ;
	public Person(T info){		// 通过构造器设置信息属性内容
		this.info = info;
	}
	public void setInfo(T info){
		this.info = info ;
	}
	public T getInfo(){
		return info ;
	}
	@Override
	public String toString() {
		return "Person [info=" + info + "]";
	}
	
}
public class GenericPerson{
	public static void main(String args[]){
		Person<Contact> per = null ;		// 声明Person对象
		per = new Person<Contact>(new Contact("北京市","01088888888","102206")) ;
		System.out.println(per);
		
		Person<Introduction> per2 = null ;		// 声明Person对象
		per2 = new Person<Introduction>(new Introduction("李雷","男",24));
		System.out.println(per2) ;
	}
}