Ubuntu java install & config

1. im:http://jingyan.baidu.com/article/08b6a591cb06f114a8092209.html
   http://www.cnblogs.com/zknublx/p/5946227.html
   http://blog.csdn.net/blueheart20/article/details/51901867

2. java :http://jingyan.baidu.com/article/c33e3f48a3365dea15cbb5c9.html
   http://www.linuxidc.com/Linux/2016-11/136958.htm
   http://www.cnblogs.com/a2211009/p/4265225.html