對於類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");//動態加載類
或者
ClassLoader loader = Thread.currentThread().getContextClassLoader();//獲得加載器
Class cls = loader.loadClass("com.mychebao.zzm.entity.Car");//加載，感覺這個是個類的結構，包含所有東西就等着你拿起來用
構造函數
Constructor cons = cls.getDeclaredConstructor((Class[])null);//獲取構造函數此處爲無參的
實例化對象
Car car = (Car)cons.newInstance();//構造函數實例化Car
或者
Car car = (Car)cls.newInstance();//直接實例化
操作對象
Method setBrand = cls.getDeclaredMethod("setBrand", String.class);//獲取參數是String的setBrand方法
Method[] methods = cls.getMethods();//獲取所有方法(public的)
Method[] methods = cls.getDeclaredMethods();//獲取所有方法
setBrand.invoke(car, "碰碰車！");//對car對象執行這個方法
String name=method.getName();//獲取方法名
Class[] types=method.getParameterTypes();//獲取方法的參數類型
Field colorFld = cls.getDeclaredField("color");//獲取color屬性無論公私
colorFld.setAccessible(true);//設置爲可操作，如果是私有屬性設置爲true後即可對其進行進一步操作,反射可以無視其private屬性，破防呀
colorFld.set(pCar, "黑");直接給屬性賦值
method.getAnnotation(Test.class);//方法是是否含有Test註解
Class[] types = {String.class,int.class}; //參數是String和int的
Method m = cls.getDeclaredMethod("name", types);//獲取方法名是name參數是String和int的方法
