一，安装Java1) 安装JDK要学习和使用java，首先需要安装JDK(Java Developemnt Kit)，相当于java安装包。Java的下载页在甲骨文官网上：https://www.oracle.
看一下官方的原文定义:Reflection is a feature in the Java programming language. It allows an executing Java program to examine or “introspect” upon itself， and manipulate internal properties of the program. For example， it's possible for a Java class to obtain the names of all its members and display them.
如果你学习Java不知从何入手，效率低进度慢，很多知识点听不懂？如果你看视频学习感觉枯燥，找不到配套资料，有问题解决不掉，浪费了大把时间……这是一套真正适合小白，让你不走弯路的Java入门课！教程取尽精华，带你从入门到突破，极速上手，一撸到底。
