一、demo1

/** * @Title: ReflectDemo3.java * @Package com.lh.reflection * @Description: TODO* @author Liu * @date 2018年1月23日 下午6:05:34 * @version V1.0 */package com.lh.reflection;import java.lang.reflect.Field;import com.lh.reflection.bean.Person;/** * @ClassName: ReflectDemo3 * @Description: 获取Class中的字段* @author Liu* @date 2018年1月23日 下午6:05:34 *  */public class ReflectDemo3 {	/**	 * @throws Exception *	* @Title: main 	* @Description: TODO	* @param @param args	* @return void	* @throws 	*/	public static void main(String[] args) throws Exception {		getFieldDemo();	}	/**	 * @throws Exception *	* @Title: getFieldDemo 	* @Description: TODO	* @param 	* @return void	* @throws 	*/	private static void getFieldDemo() throws Exception {		String name = "com.lh.reflection.bean.Person";		// 寻找该类名称字节码文件 ，并加载至内存，生成Class对象		Class
    
      clazz = (Class
     
      ) Class.forName(name);				Field field = null; //clazz.getField("age");//只能获取公有的				field = clazz.getDeclaredField("age");//只获取本类，但包含私有				//对私有字段的访问取消权限检查，暴力访问，应避免！		field.setAccessible(true);				Person person = clazz.newInstance();				field.set(person, 20);		Object obj = field.get(person);				System.out.println(obj);	}		}
     
    

二、demo2

    ReflectPoint.java

package staticimport.reflect;public class ReflectPoint {	private int x;	public int y;		private String type = "bball";		private String edu = "itcast";		private String pe = "basketball";		public ReflectPoint(){}		public ReflectPoint(int x, int y) {		this.x = x;		this.y = y;	}	@Override	public String toString() {		return "ReflectPoint [x=" + x + ", y=" + y + ", type=" + type + ", edu=" + edu + ", pe=" + pe + "]";	}}

package staticimport.reflect;import java.lang.reflect.Field;public class ReflectFieldTest {	public static void main(String[] args) throws Exception {		ReflectPoint reflectPoint = new ReflectPoint(4, 5);				Field fieldY = reflectPoint.getClass().getField("y"); 		System.out.println(fieldY.get(reflectPoint));				//不可见//		Field fieldX = reflectPoint.getClass().getField("x");		//获取本类已声明的字段(包含私有)		Field fieldX = reflectPoint.getClass().getDeclaredField("x");				//设置可强制访问		fieldX.setAccessible(true);				fieldX.set(reflectPoint, 10);				//访问		System.out.println(fieldX.get(reflectPoint));	}}