【ThinkingInJava】27、关于class对象引用的各种关于class的方法

标签：class   string   object   java编程思想   

/**
* 书本:《Thinking In Java》
* 功能:关于class对象引用的各种关于class的方法
* 文件:ToyTest.java
* 时间:2015年4月12日19:21:32
* 作者:cutter_point
*/
package Lesson14TypeInformation.toys;

import static net.mindview.util.Print.*;

interface HasBatteries {}
interface Waterproof {}
interface Shoots {}

class Toy
{
	Toy() {}
	Toy(int i) {}
}

class FancyToy extends Toy implements HasBatteries, Waterproof, Shoots
{
	FancyToy() { super(1); }
}

class A
{
	public String aa = " wuwuwwu";
	public A() {System.out.println("========================");}
	public A(String a) { this.aa = a; }
	
	
	public void get()
	{
		System.out.println("=====" + aa);
	}
}

public class ToyTest 
{
	static void printInfo(Class cc)
	{
		print("Class name: " + cc.getName() + " is interface? [" + cc.isInterface() +"]");
		print("Simple name: " + cc.getSimpleName());
		print("Canonical name : " + cc.getCanonicalName());		//经典名，就是全名包括包
	}

	public static void main(String[] args) 
	{
		Class c = null;
		
		try 
		{
			c = Class.forName("Lesson14TypeInformation.toys.FancyToy");
		} 
		catch (ClassNotFoundException e) 
		{
			print("Cant`t find FancyToy");
			System.exit(1);
		}
		
		printInfo(c);
		
		for(Class face : c.getInterfaces())
		{
			printInfo(face);		//输出这个类型的每一个接口
		}
		
		Class up = c.getSuperclass();	//得到父类
		Object obj = null;
		
		try 
		{
			obj = up.newInstance();
		} 
		catch (InstantiationException e) 
		{
			print("Cannot instantiate");
			System.exit(1);
		} 
		catch (IllegalAccessException e) 
		{
			print("Cannot access");
			System.exit(1);
		}	//实例化一个对象
		
		printInfo(obj.getClass());
		
		Class b = null;
		A a1 = new A("a111111111111111111111");
//		A a2 = new A("a222222222222222222222");
		Object a3 = null;
		A a4 = null;
		
		try {
			b = Class.forName("Lesson14TypeInformation.toys.A");
//			Class th = b.getClass();
			a4	= (A) b.newInstance();		//得到类的对象，但是没有实例化
//			a4 = (A) a3;
			a4.get();
			
		} catch (Exception e) 
		{
			e.printStackTrace();
		}
	}
}

输出：

Class name: Lesson14TypeInformation.toys.FancyToy is interface? [false]  obj1
Simple name: FancyToy  obj1
Canonical name : Lesson14TypeInformation.toys.FancyToy  obj1
Class name: Lesson14TypeInformation.toys.HasBatteries is interface? [true]  obj1
Simple name: HasBatteries  obj1
Canonical name : Lesson14TypeInformation.toys.HasBatteries  obj1
Class name: Lesson14TypeInformation.toys.Waterproof is interface? [true]  obj1
Simple name: Waterproof  obj1
Canonical name : Lesson14TypeInformation.toys.Waterproof  obj1
Class name: Lesson14TypeInformation.toys.Shoots is interface? [true]  obj1
Simple name: Shoots  obj1
Canonical name : Lesson14TypeInformation.toys.Shoots  obj1
Class name: Lesson14TypeInformation.toys.Toy is interface? [false]  obj1
Simple name: Toy  obj1
Canonical name : Lesson14TypeInformation.toys.Toy  obj1
========================
===== wuwuwwu

【ThinkingInJava】27、关于class对象引用的各种关于class的方法

标签：class   string   object   java编程思想   

原文地址：http://blog.csdn.net/cutter_point/article/details/45786133