JDK、IDEA安装步骤
JDK：
下载JDK，然后安装：

环境配置：

1鼠标右键打开我的电脑，找到“属性”。

2打开属性后，找到“高级”，找到下面的“环境变量”并打开。

3在环境变量中，选择“新建”，变量名填上JAVA_HOME，变量值填上C:\Program Files (x86)\Java\jdk1.8.0_144。

4还要修改一个地方，就是Path，添加JAVA的变量值到Path中，选择Path，然后点“编辑”，在最后面添加如下语句;%JAVA_HOME%\bin;
补充：如果javac出不来，直接添加C:\Program Files (x86)\Java\jdk1.8.0_144\bin。
5好了，环境变量已经设置好了，点击确定就可以了。现在开始测试一下，是不是真的可以了，打开DOS窗口，在左下角的“开始”中，“运行”输入“CMD”，打开DOS窗口，输入命令 java -version并回车。

6输入javac

IDEA:
下载：进入官网下载IntelliJ IDEA https://www.jetbrains.com/idea/download/#section=windows,

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下载破解补丁JetbrainsCrack-2.6.2.jar
地址:http://download.csdn.net/detail/gnail_oug/9824630 或者 http://idea.lanyus.com/

11将你下载好的JetbrainsCrack-2.6.2.jar拷贝到你的Idea安装目录的bin目录下,如下图红色框所示

在安装的idea下面的bin目录下面有2个文件 ： 一个是idea64.exe.vmoptions，还有一个是idea.exe.vmoptions（如上图绿框）。

用记事本打开 分别在最下面一行增加一行：-javaagent:D:\IDEA\bin\JetbrainsCrack-2.6.2.jar

注意:“D:\IDEA\bin\JetbrainsCrack-2.6.2.jar”是我对应的JetbrainsCrack-2.6.2.jar的位置,你用你自己的安装路径。

12重新启动软件,再到Acrivation code中选择界面的时候,写入下面注册代码

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注：打开后如果显示 NO SDK:

选中jdk安装的安装路径，点击OK即可