Java 通过反射实例化对象

Car.java
package com.bjfu.ioc;
 
public class Car {
 
private String brand;
private String color;
private int maxSpeed;
 
public Car(){}
 
public Car(String brand, String color, int maxSpeed) {
super();
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;
}
 
@Override
public String toString() {
return "Car [brand=" + brand + ", color=" + color + ", maxSpeed="
+ maxSpeed + "]";
}
 
}
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package com.bjfu.ioc;
 
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
 
public class ReflectTest {
 
/**
* @param args
* @throws Throwable 
*/
public static void main(String[] args) throws Throwable {
// TODO Auto-generated method stub
Car car = initByDefaultConst();
System.out.println(car);
}
 
public static Car initByDefaultConst() throws Throwable {
 
ClassLoader loader = Thread.currentThread().getContextClassLoader();
Class clazz = loader.loadClass("com.bjfu.ioc.Car");
 
Constructor cons = clazz.getDeclaredConstructor((Class[])null);
Car car = (Car)cons.newInstance();
 
Method setBrand = clazz.getMethod("setBrand", String.class);
setBrand.invoke(car, "red carCA72");
Method setColor = clazz.getMethod("setColor", String.class);
setColor.invoke(car, "black");
Method setMaxSpeed = clazz.getMethod("setMaxSpeed", int.class);
setMaxSpeed.invoke(car, 2000);
 
return car;
}
 
}