泛型使用

package practice;
import java.lang.reflect.Method;
import java.util.*;
/**
 * @author qingfeng
 * 功能：介绍泛型存在的必要性和泛型的使用
 */
public class FanXing {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        /*
        ArrayList al = new ArrayList();
        Dog dog = new Dog("huang", 12);
        al.add(dog);
        Dog dog1 = (Dog)al.get(0);//必须显性强制转换
        Cat cat1 = (Cat)al.get(0);//如果写错类型，编译器不会报错
        System.out.println("这是一只"+dog1.getName());
        System.out.println("年龄"+dog1.getAge());
        */
        /*
        ArrayList<Dog> al = new ArrayList<Dog>();//泛型使用
        al.add(new Dog("aa",23));
        Dog dog1 = al.get(0);//隐式强制转换
        System.out.println("这是一只"+dog1.getName());
        */
        
        
        Fan<String> fan1 = new Fan<String>("aaa");
        fan1.showTypeName();
        Fan<Cat> fan2 = new Fan<Cat>(new Cat());
        fan2.showTypeName();
        Fan<Integer> fan3 = new Fan<Integer>(123);
        fan3.showTypeName();
        Fan<Float> fan4 = new Fan<Float>(123.1f);
        fan4.showTypeName();
        
        System.out.println("---------------------");
        //反射机制获取tyep类的很多信息
        fan1.showInfo();
        System.out.println("---------------------");
        fan2.showInfo();
        
    }

}
class Cat
{
    public void showInfo1()
    {
        System.out.println("您好！");
    }
    public void showInfo2()
    {
        System.out.println("您好！世界！");
    }
    
}

class Dog
{
    private String name;
    private int age;
    
    public Dog(String name, int age)
    {
        this.name = name;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }
}

class Fan<Type>//泛型类  
{
    private Type temp;
    
    public Fan(Type temp)
    {
        this.temp = temp;
    }
    //得到temp的类型名称
    public void showTypeName()
    {
        System.out.println("temp的传入的类型为："+temp.getClass().getName());
    }
    
    public void showInfo()
    {
        //反射机制 可以得到传入的type的很多信息！
        Method m[] = temp.getClass().getDeclaredMethods();
        for(int i=0; i<m.length; i++)
        {
            System.out.println("Type类型所调用的方法："+m[i].getName());
        }
        
    }
}