class="java">

package 测试;

import java.lang.reflect.Constructor;

import java.lang.reflect.Field;

import java.lang.reflect.Method;

import java.lang.reflect.Modifier;

public class TestDemo {

public String toString(Object obj) {//重写toString()方法

Class clazz = obj.getClass();

StringBuilder sb = new StringBuilder();

Package pakName = clazz.getPackage();

sb.append("包名:"+pakName.getName()+"\t");

String className = clazz.getSimpleName();

sb.append("类名:"+className+"\n");

sb.append("公共构造方法:\n");

//获得所有代表构造方法的Constructor数组

Constructor[] cons = clazz.getDeclaredConstructors();

for(Constructor constructor : cons) {

String modifier = Modifier.toString(constructor.getModifiers());//获得修饰符

if(modifier.contains("public")) {

sb.append(constructor.toGenericString()+"\n");

}

}

sb.append("公共域:\n");

Field[] fields = clazz.getDeclaredFields();//获得代表所有域的Field数组

for(Field field : fields) {

String modifier = Modifier.toString(field.getModifiers());

if(modifier.contains("public")) {

sb.append(field.toGenericString()+"\n");

}

}

sb.append("公共方法:\n");

Method[] methods = clazz.getDeclaredMethods();//获得代表所有方法的Method数组

for(Method method : methods) {

String modifier = Modifier.toString(method.getModifiers());

if(modifier.contains("public")) {//查看修饰符是否有public

sb.append(method.toGenericString()+"\n");

}

}

return sb.toString();

}

public static void main(String args[]){

System.out.println(new TestDemo().toString(new java.util.Date()));//在此处输入你要反射查询的java类,比如此处查询的是Date()类

}

}