反射 Class Method Field 初步使用
代码小例子：

package com.test;import java.lang.reflect.Constructor;import java.lang.reflect.Field;import java.lang.reflect.Method;public class ReflectTest{// object's copypublic static Object copy(Object obj) throws Exception, Exception{Class<? extends Object> clazz = obj.getClass();// Constructor con = clazz.getConstructor(new// Class[]{int.class,String.class});Constructor con = clazz.getConstructor();// Object o = con.newInstance(new Object[]{1,"2"});Object o = con.newInstance(new Object[] {});Field[] field = clazz.getDeclaredFields();for (Field field2 : field){String name = field2.getName();String firstLetter = name.substring(0, 1).toUpperCase();String getMethodName = "get" + firstLetter + name.substring(1);String setMethodName = "set" + firstLetter + name.substring(1);Method getMethod = clazz.getMethod(getMethodName, new Class[] {});Method setMethod = clazz.getMethod(setMethodName,new Class[] { field2.getType() });Object value = getMethod.invoke(obj, new Object[] {});setMethod.invoke(o, new Object[] { value });// System.out.println(field2);System.out.println(getMethodName);System.out.println(setMethodName);}// System.out.println(o);return o;}public static void main(String[] args) throws Exception{           People p = new People();           p.setAge(1);           p.setName("liu");           p.setHight("66kg");           People p2 = (People) ReflectTest.copy(p);System.out.println(p2.getAge());System.out.println(p2.getHight());System.out.println(p2.getName());}}class People{private int age;private String name;private String hight;public People(){}public People(int age, String name){this.age = age;this.name = name;}public int getAge(){return age;}public void setAge(int age){this.age = age;}public String getName(){return name;}public void setName(String name){this.name = name;}public String getHight(){return hight;}public void setHight(String hight){this.hight = hight;}}