java反射几个方法

对于类Car
package com.mychebao.zzm.entity;
public class Car{
private String brand;
private String color;
private int maxSpeed;
public Car(){
    super();
}
public Car(String brand, String color, int maxSpeed){
    super();
    this.brand = brand;
    this.color = color;
    this.maxSpeed = maxSpeed;
}
public void introduce(){
    System.out.println( "Car [brand=" + brand + ", color=" + color + ", maxSpeed=" + maxSpeed + "]");
}
public String getBrand(){
    return brand;
}
public void setBrand(String brand){
    this.brand = brand;
}
public String getColor(){
    return color;
}
public void setColor(String color){
    this.color = color;
}
public int getMaxSpeed(){
    return maxSpeed;
}
public void setMaxSpeed(int maxSpeed){
    this.maxSpeed = maxSpeed;
}

}
反射

Class cls = Class.forName("com.mychebao.zzm.entity.Car");//动态加载类

或者

ClassLoader loader = Thread.currentThread().getContextClassLoader();//获得加载器
Class cls = loader.loadClass("com.mychebao.zzm.entity.Car");//加载，感觉这个是个类的结构，包含所有东西就等着你拿起来用

构造函数

Constructor cons = cls.getDeclaredConstructor((Class[])null);//获取构造函数此处为无参的

实例化对象

Car car = (Car)cons.newInstance();//构造函数实例化Car
或者
Car car = (Car)cls.newInstance();//直接实例化

操作对象

Method setBrand = cls.getDeclaredMethod("setBrand", String.class);//获取参数是String的setBrand方法
Method[] methods = cls.getMethods();//获取所有方法(public的)
Method[] methods = cls.getDeclaredMethods();//获取所有方法
setBrand.invoke(car, "碰碰车！");//对car对象执行这个方法
String name=method.getName();//获取方法名
Class[] types=method.getParameterTypes();//获取方法的参数类型
Field colorFld = cls.getDeclaredField("color");//获取color属性无论公私
colorFld.setAccessible(true);//设置为可操作，如果是私有属性设置为true后即可对其进行进一步操作,反射可以无视其private属性，破防呀
colorFld.set(pCar, "黑");直接给属性赋值
method.getAnnotation(Test.class);//方法是是否含有Test注解

Class[] types = {String.class,int.class}; //参数是String和int的
Method m = cls.getDeclaredMethod("name", types);//获取方法名是name参数是String和int的方法