反射基础

package day1;

import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;

public class GetDeom {
    public static void main(String[] args) throws Exception {
//获取所有成员方法
        Class studentClass = Student.class;
        Method[] methods = studentClass.getMethods();
        for (Method method : methods) {
            System.out.println(method);
        }
        System.out.println("==========");
        Method eat = studentClass.getMethod("eat",String.class);
        Student s=new Student();
        eat.invoke(s,"饭");
        System.out.println("==========");
        //获取所有构造方法
        Constructor declaredConstructor = studentClass.getDeclaredConstructor();
        System.out.println(declaredConstructor);
        Constructor[] declaredConstructors = studentClass.getDeclaredConstructors();
        for (Constructor constructor : declaredConstructors) {
            System.out.println(constructor);
            System.out.println("==========");
            //获取所有的成员变量
            Field b = studentClass.getField("c");//只获取public修饰符下的成员变量
            System.out.println(b);
            System.out.println("==========");
            //获取所有成员变量包括private修饰的
            Field[] declaredFields = studentClass.getDeclaredFields();
            for (Field declaredField : declaredFields) {
                System.out.println(declaredField);
            }
            System.out.println("==========");
            //暴力反射
            Field name = studentClass.getDeclaredField("name");
            name.setAccessible(true);
            Object o = name.get(s);
            System.out.println(o);


        }

    }
}

package day1;

public class Student {

    private String name;
    private int age;
    public int c;

    public Student(String name, int age) {
        this.name = name;
        this.age = age;

    }

    public Student() {

    }

    public void eat(String foot){
        System.out.println("eat已经执行"+foot);
    }
}