泛型应用范例

定义一个Person类，并为之定义联系方式和基本信息等属性。

package book;

interface Info{//定义一个标识接口，此接口没有定义任何方法

}
//定义联系方式类，实现Info接口
class Contact implements Info{
	private String address;
	private String telphone;
	private String zipcode;
	public Contact(String address,String telphone,String zipcode) {
		this.setAddress(address);
		this.setTelphone(telphone);
		this.setZipcode(zipcode);
	}
	public String getAddress() {
		return address;
	}
	public void setAddress(String address) {
		this.address = address;
	}
	public String getTelphone() {
		return telphone;
	}
	public void setTelphone(String telphone) {
		this.telphone = telphone;
	}
	public String getZipcode() {
		return zipcode;
	}
	public void setZipcode(String zipcode) {
		this.zipcode = zipcode;
	}
	public String toString() {
		return "联系方式:"+"\n"+
	"\t|-联系电话:"+this.telphone+"\n"+
	"\t|-联系地址:"+this.address+"\n"+
	"\t|-邮政编码:"+this.zipcode;
	}
}

//定义个人信息类，实现Info接口
class Introduction implements Info{
	private String name;
	private String sex;
	private int age;
	public Introduction(String name,String sex,int age) {
		this.setName(name);
		this.setSex(sex);
		this.setAge(age);
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getSex() {
		return sex;
	}
	public void setSex(String sex) {
		this.sex = sex;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public String toString() {
		return "基本信息:"+"\n"+
	"\t|-姓名:"+this.name+"\n"+
	"\t|-性别:"+this.sex+"\n"+
	"\t|-年龄:"+this.age;
	}
}

//定义Person类，Person类中的info属性的类型使用泛型
class Person<T extends Info>{
	private T info;
	public Person(T info) {
		this.setInfo(info);
	}
	public T getInfo() {
		return info;
	}
	public void setInfo(T info) {
		this.info = info;
	}
	public String toString() {
		return this.info.toString();
	}
}

//将Contact类型设置为泛型类型
public class JiOu{
	public static void main(String args[]) {
		Person<Contact>per1 = null;
		Person<Introduction>per2 = null;
		per1 = new Person<Contact>(new Contact("广州市","15626164101","510520"));
		per2 = new Person<Introduction>(new Introduction("smc","男",22));
		System.out.println(per1);
		System.out.println(per2);
	}
}

运行结果：

联系方式:
	|-联系电话:15626164101
	|-联系地址:广州市
	|-邮政编码:510520
基本信息:
	|-姓名:smc
	|-性别:男
	|-年龄:22