package com.Higgin.reflect;
import java.util.List;public class Person {private String name="NULL";private int age=0;public Person(){System.out.println("构造方法：Person()");}public Person(String name){System.out.println("构造方法：Person(String name)");this.name=name;}public Person(String name,int age){this.name=name;this.age=age;System.out.println("构造方法：Person(String name,int age)");}/*** 注意：是private 私有的！！！！！！！！*/private Person(List list){System.out.println("构造方法：Person(List list)");System.out.println("list.get(0):"+list.get(0));}public void sayHello(){System.out.println(name+" say: hello world!");System.out.println("I'm "+age+" years old");}
}

/** 反射Person类的 Person()构造方法，创建类的对象* @throws Exception*/@Testpublic void test1() throws Exception{Class clazz=Class.forName("com.Higgin.reflect.Person");//反射构造方法：public Person()Constructor c=clazz.getConstructor(null); Person p=(Person)c.newInstance(null);p.sayHello();}

/** 反射构造方法：public Person(String name)*/@Testpublic void test2() throws  Exception{Class clazz=new Person().getClass();  //注意，这里其实已经先创建了一个对象（因为new Person（））//反射构造方法：public Person(String name)Constructor c=clazz.getConstructor(String.class);Person p=(Person) c.newInstance("Jack");p.sayHello();}

/** 反射构造方法：public Person(String name,int age)*/@Testpublic void test3() throws  Exception{Class clazz=Person.class;//反射构造方法：public Person(String name,int age)Constructor c=clazz.getConstructor(String.class,int.class);Person p=(Person) c.newInstance("Jack",18);p.sayHello();}

/** 注意是私有的* 反射构造方法：private Person(List list)*/@Testpublic void test4() throws  Exception{Class clazz=Person.class;//反射构造方法：private Person(List list)Constructor c=clazz.getDeclaredConstructor(List.class); c.setAccessible(true);    //暴力反射，没有这句会出错的！！！！！！！！List list=new ArrayList();list.add("6666666");Person p=(Person) c.newInstance(list);p.sayHello();}

    /*** 创建对象的另外一种方式* @throws Exception*/@Testpublic void test5() throws  Exception{Class clazz=Class.forName("com.Higgin.reflect.Person");Person p=(Person)clazz.newInstance();  //本质就是反射类的无参构造方法反射对象
        p.sayHello();}