java反射机制-简单实例

public class Car {    private String brand;    private String color;    private int maxSpeed;

public Car() {    }

public Car(String brand, String color, int maxSpeed) {        this.brand = brand;        this.color = color;        this.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;    }

public void introduce() {        System.out.println("brand:"+brand+";color:"+color+";maxspeed:"+maxSpeed);    }}

//通过类加载器加载Car类对象ClassLoader loader = Thread.currentThread().getContextClassLoader();Class<?> clazz = loader.loadClass("com.example.demo.Test.Car");

//获取类的默认构造器并通过它实例化CarConstructor cons = clazz.getDeclaredConstructor((Class[]) null);Car car = (Car) cons.newInstance();

//通过反射方法设置属性Method setBrand = clazz.getMethod("setBrand", String.class);setBrand.invoke(car, "红旗CA72");Method setColor = clazz.getMethod("setColor", String.class);setColor.invoke(car, "黑色");Method setMaxSpeed = clazz.getMethod("setMaxSpeed", int.class);setMaxSpeed.invoke(car, 200);return car;