1 打开命令行窗口,输入java -version。
若提示不认识java命令,说明没有java环境。
![](http://upload-images.jianshu.io/upload_images/6946981-7dd298244c3b381d.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/677/format/webp)
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2 从甲骨文网站(http://www.oracle.com/technetwork/java/javase/downloads/index.html)下载jdk。
如果是纯粹学习的话,下最新版的;如果是做项目的话,下载跟项目相适应的版本。
![](http://upload-images.jianshu.io/upload_images/6946981-3a79573b4747535c.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/817/format/webp)
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3 双击jdk的安装程序,进行安装
![](http://upload-images.jianshu.io/upload_images/6946981-66860c5a9f98a0bc.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/514/format/webp)
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4 安装路径可按默认
![](http://upload-images.jianshu.io/upload_images/6946981-33e5c5f6719f91ef.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/514/format/webp)
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5 安装进度条
![](http://upload-images.jianshu.io/upload_images/6946981-4852f9af749d1dab.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/514/format/webp)
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6 按默认,下一步
![](http://upload-images.jianshu.io/upload_images/6946981-73dc0923ce08d711.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/514/format/webp)
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7 安装完成,关闭
![](http://upload-images.jianshu.io/upload_images/6946981-6f8c46762e057cf8.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/514/format/webp)
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8 在命令行窗口再次输入java -version,显示出版本号
![](http://upload-images.jianshu.io/upload_images/6946981-1c0bc3215bef359f.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/677/format/webp)