通过Java反射机制构造类的对象_java 通过类构造对象-优快云博客

本文详细介绍了如何使用Java的反射API来创建并操作对象，包括获取类、构造器、方法和字段，并通过反射方法设置属性。

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参考的帖子如下：

http://www.iteye.com/topic/1123081

package com.baobaotao.reflect;

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

	//①默认构造函数  
	public Car(){}  

	//②带参构造函数  
	public Car(String brand,String color,int maxSpeed){   
		this.brand = brand;  
		this.color = color;  
		this.maxSpeed = maxSpeed;  
	}  

	//③未带参的方法  
	public void introduce() {   
		System.out.println("brand:"+brand+";color:"+color+";maxSpeed:" +maxSpeed);  
	}  

	//带参数的getter/Setter方法  

	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;
	}

}

package com.baobaotao.reflect;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
public class ReflectTest {
	public static Car  initByDefaultConst() throws Throwable
	{
		//①通过类装载器获取Car类对象
		ClassLoader loader = Thread.currentThread().getContextClassLoader(); 
		Class clazz = loader.loadClass("com.baobaotao.reflect.Car"); 

		//②获取类的默认构造器对象并通过它实例化Car
		Constructor cons = clazz.getDeclaredConstructor((Class[])null); 
		Car car = (Car)cons.newInstance();


		//③直接调用反射方法设置属性
		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;
	}

	public static void main(String[] args) throws Throwable {
		Car car = initByDefaultConst();
		car.introduce();
	}
}