package com.at221;

import java.io.Serializable;

import java.lang.reflect.*;

import org.junit.Test;

public class TestReflection {

    @Test

    public void test1() throws Exception{

        Class<?> class1 = null;

        Class<?> class2 = null;

        Class<?> class3 = null;

        //对象实例化的第一种方式：

        class1 = Class.forName("com.at221.Person");

//        Person person = (Person)class1.newInstance();

        //对象实例化的第二种方式：

        class2 = new Person().getClass();

        //第三种对象实例化的方式：

        class3 = Person.class;

        System.out.println(class1);

        System.out.println(class2);

        System.out.println(class3);

    }

    /*运行结果：

     *     class com.at221.Person

        class com.at221.Person

        class com.at221.Person

     *

     */

    //获取类的父类和接口：

    @Test

    public void test2() throws Exception{

        Class<?> class1 = Class.forName("com.at221.Person");

        Class<?> parentclass = class1.getSuperclass();

        System.out.println(parentclass.getName());

        System.out.println("----------------");

        Class<?> inte[] = class1.getInterfaces();

        for(int i = 0; i < inte.length; i++){

            System.out.println(inte[i].getName());

        }

    }

    /*

     * 运行结果：

     *     com.at221.Creture

        ----------------

        java.io.Serializable

     */

    //获取类的属性和属性的作用域和类型：

    @Test

    public void test3(){

        Class<?> class2 = new Person().getClass();

        Field[] fields = class2.getDeclaredFields();

        for(int i = 0; i < fields.length; i++){

            Class<?> types = fields[i].getType();

            int mo = fields[i].getModifiers();

            System.out.println(Modifier.toString(mo) + " " +

                                types.getName() + " " + fields[i].getName() + "\n");

        }

        /*运行结果：

         *     private static final long serialVersionUID

            private java.lang.String name

            private int age

            private java.lang.String nation

         *

         */

        //获取构造器的各种信息：

        Class<?> class3 = new Person().getClass();

        Constructor<?> construtor[] = class3.getDeclaredConstructors();

        for(int i = 0; i < construtor.length; i++){

            int mo = construtor[i].getModifiers();

            Class<?> types[] = construtor[i].getParameterTypes();

            System.out.println(Modifier.toString(mo) + " " + construtor[i].getName());

            System.out.println(i + ": ");

            for(int j = 0; j < types.length; j++){

                System.out.print(types[j].getName() + " ");

            }

            System.out.println("--------------");

        }

        /*运行结果：

         *     public com.at221.Person

            0:

            --------------

            public com.at221.Person

            1:

            java.lang.String int java.lang.String --------------

         *

         */

     }

    @Test

    public void test4(){

        //获取类中的方法：

        Class<?> class4 = Person.class;

        Method methods[] = class4.getDeclaredMethods();

        for(int i = 0; i < methods.length; i++){

            int mod = methods[i].getModifiers();//获取函数的作用域；

            Class<?> returnTypes = methods[i].getReturnType();//q就函数的返回值;

            System.out.print("method[" + i + "] :" + Modifier.toString(mod) + " " +

                                " " + returnTypes.getName() + " " + methods[i].getName() + " ( ");

            Class<?> parameterType[] = methods[i].getParameterTypes();//获取函数的形参类型；

            for(int j = 0; j < parameterType.length; j++){

                System.out.print(parameterType[j].getName() + " ");

            }

            System.out.println(")");

        }

    }

    /*运行结果：

     *     method[0] :public  java.lang.String toString ( )

        method[1] :public  java.lang.String getName ( )

        method[2] :public  void setName ( java.lang.String )

        method[3] :public  int getAge ( )

        method[4] :public  void setAge ( int )

        method[5] :public  java.lang.String getNation ( )

        method[6] :public  void setNation ( java.lang.String )

     *

     */

}

class Person extends Creture implements Serializable {

    /**

     *

     */

    private static final long serialVersionUID = 1L;

    private String name;

    private int age;

    private String nation;

    public Person() {

        super();

    }

    public Person(String name, int age, String nation) {

        super();

        this.name = name;

        this.age = age;

        this.nation = nation;

    }

    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;

    }

    public String getNation() {

        return nation;

    }

    public void setNation(String nation) {

        this.nation = nation;

    }

    @Override

    public String toString() {

        return "Person [name=" + name + ", age=" + age + ", nation=" + nation + "]";

    }

}

class Creture{

    public Creture(){

        super();

    }

    public void show(){

        System.out.println("!!!i am a creture!!!");

    }

}