关于张老师的reflect视频实践 - 黑马程序员技术交流社区

import java.lang.reflect.*;
class Student
{
public String name;
private int age;
private int score;
public Student(){}
public Student(String str){
this.name=str;
}
public Student(String name,int age,int score){
this.name=name;
this.age=age;
this.score=score;
}
public String getname(){
return this.name;
}
public int getage()
{
return this.age;
}
public int getscore()
{
return this.score;
}
public void printInfo(){
System.out.println("该生的信息如下："+"\r\n"+name+" "+age+" "+score);
}
public String toString(){
if(this.age==0&&this.score==0)
{
return "毕加猪经典语录："+"\r\n"+name;
}
return "毕加猪经典语录："+"\r\n"+name+" "+age+" "+score;
}
}
class ReflectDemo
{
public static void main(String[] args) throws Exception
{
Student stu1=new Student("黑马_冯华亮",11,22);
Student stu2=new Student("黑马_郑小杰",33,44);
getconstructor();
System.out.println("----------------------------");
getfield(stu1);
System.out.println("----------------------------");
getmethod(stu2);
}
public static void getconstructor() throws Exception
{
Constructor constru=Class.forName("Student").getConstructor(String.class);
Student stu=(Student)constru.newInstance("笑只是个表情，与快乐无关");
System.out.println(stu.toString());
}
public static void getfield(Student stu) throws Exception
{
//Student类中score是private的，采用getDeclaredField（）方法
Field field=Class.forName("Student").getDeclaredField("score");
field.setAccessible(true);
int score=(int)field.get(stu);
System.out.println(stu.getname()+"的成绩是： "+score);
}
public static void getmethod(Student stu) throws Exception
{
Method mthod=Class.forName("Student").getMethod("printInfo");
mthod.invoke(stu);
System.out.println("如果你看见学生信息输出，则说明方法映射successfully");
System.out.println("");
}
}

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