设置字体:https://jingyan.baidu.com/article/f96699bb9442f3894e3c1b15.html
general->appearance->colors and fonts
自动补全:https://jingyan.baidu.com/article/d45ad148b214a969552b8001.html
java->editor->content assist
.abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ