反射-运行时变更field内容

package com.reflect;

import java.lang.reflect.Field;
/**
 * @Description:     运行时变更field内容         
 */
public class RefFiled {
	public double x;
	public Double y;
	
	public static void main(String[] args) throws SecurityException, NoSuchFieldException, IllegalArgumentException, IllegalAccessException {
		Class<RefFiled> c = RefFiled.class;
		Field xf = c.getField("x");
		Field yf = c.getField("y");
		
		RefFiled obj = new RefFiled();
		System.out.println("变更前x=" + xf.get(obj));
		//变更成员x值
		xf.set(obj, 1.1);
		System.out.println("变更后x="+xf.get(obj));
		
		System.out.println("变更前y=" +yf.get(obj));
		//变更成员y值
		yf.set(obj, 2.1);
		System.out.println("变更后y=" + yf.get(obj));
		
		/**变更前x=0.0
			变更后x=1.1
			变更前y=null
			变更后y=2.1
		 */
	}

}