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反射对象构造函数、方法及字段
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‎src/org/javacore/reflection/ReflectionTest.java‎

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package org.javacore.reflection;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.Field;
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import java.lang.reflect.Method;
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import java.lang.reflect.Modifier;
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/*
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* Copyright [2015] [Jeff Lee]
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* @author Jeff Lee
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* @since 2015-11-9 10:45:19
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* 反射对象构造函数、方法及字段
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*/
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public class ReflectionTest {
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public final int AGE = 1;
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public static void main(String[] args) {
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Class cl = null;
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try {
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cl = Class.forName("org.javacore.reflection.ReflectionTest");
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System.out.println("打印析构函数：");
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printConstructors(cl);
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System.out.println("打印方法：");
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printMethods(cl);
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System.out.println("打印字段：");
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printFields(cl);
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} catch (ClassNotFoundException e) {
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e.printStackTrace();
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}
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}
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/**
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* 打印Class对象的析构方法
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* @param cl
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*/
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public static void printConstructors(Class cl){
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// 返回类所有的析构方法
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Constructor[] constructors = cl.getDeclaredConstructors();
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for (Constructor c : constructors){
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// 返回析构方法名称
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String name = c.getName();
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System.out.print(" ");
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// 获取Java语言的修饰符
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// 修饰符由 Java 虚拟机的 public、protected、private、
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// final、static、abstract 和 interface 对应的常量组成；
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String modifiers = Modifier.toString(c.getModifiers());
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if (modifiers.length() > 0)
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System.out.print(modifiers + " ");
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System.out.print(name + "(");
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// 获取析构方法的参数对象列表数组
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Class[] paramTypes = c.getParameterTypes();
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for (int i = 0; i < paramTypes.length;i++){
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if (i > 0)
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System.out.print(", ");
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System.out.print(paramTypes[i].getName());
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}
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System.out.println(");");
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}
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}
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/**
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* 打印对象所有的方法
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* @param cl
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*/
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public static void printMethods(Class cl){
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// 获取类所有方法对象数组
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Method[] methods = cl.getMethods();
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for (Method m : methods) {
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// 获取方法返回对象
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Class retType = m.getReturnType();
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String name = m.getName();
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System.out.print(" ");
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// 获取Java语言的修饰符
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// 修饰符由 Java 虚拟机的 public、protected、private、
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// final、static、abstract 和 interface 对应的常量组成；
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String modifiers = Modifier.toString(cl.getModifiers());
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if (modifiers.length() > 0)
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System.out.print(modifiers + " ");
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System.out.print(retType.getName() +" " + name + "(");
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// 获取方法的参数对象列表数组
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Class[] paramTypes = m.getParameterTypes();
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for (int i = 0; i < paramTypes.length;i++){
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if (i > 0)
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System.out.print(", ");
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System.out.print(paramTypes[i].getName());
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}
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System.out.println(");");
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}
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}
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public static void printFields(Class clazz){
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// 获取字段Field对象数组
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Field[] fields = clazz.getFields();
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for (Field field : fields){
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// 获取字段声明类型对象
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Class type = field.getType();
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// 获取字段名称
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String name = field.getName();
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System.out.print(" ");
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// 获取Java语言的修饰符
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// 修饰符由 Java 虚拟机的 public、protected、private、
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// final、static、abstract 和 interface 对应的常量组成；
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String modifiers = Modifier.toString(field.getModifiers());
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if (modifiers.length() > 0)
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System.out.print(modifiers + " ");
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System.out.print(type.getName() + " " + name);
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}
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}
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}

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