java在运行过程中，构建类，并获取方法集和属性集，构建实例并调用方法。

package com;import java.lang.reflect.Method;public class Test {public static void main(String args[]) {Class<?> c1 = null; // 声明Class对象c1Person per = null;try {c1 = Class.forName("com.Person");System.out.println(c1.getName() + " ");Method m[] = c1.getMethods();for (Method oo : m) {System.out.print(oo.getName() + " ");Class<?> r = oo.getReturnType();System.out.print(r.getName() + " ");Class<?> p[] = oo.getParameterTypes();for (Class<?> o : p) {System.out.print(o.getName() + " ");}System.out.println();}} catch (ClassNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();}//try {per = (Person) c1.newInstance();per.speak();} catch (InstantiationException | IllegalAccessException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}

//运行结果
com.Person 
speak void java.lang.String 
speak void 
wait void 
wait void long int 
wait void long 
equals boolean java.lang.Object 
toString java.lang.String 
hashCode int 
getClass java.lang.Class 
notify void 
notifyAll void 
I am zhangsan age 20