每次重装Eclipse都要重新设置，今天写下来，以后供自己参考，也供大家参考。

Window --> Preferences --> General --> Appearance --> Text Font

Window --> Preferences --> General --> Workspace --> Other --> UTF-8 --> Apply and Close Window --> General --> Content Type --> Text --> Java Source File(可自行选择) --> Default encoding --> UTF-8 --> Apply and Close

Window --> Preferences --> General --> Editors --> Text Editors --> …(如图） Window --> Preferences --> Java --> Code Style --> Formatter --> Edit… --> Indentation --> Spaces only --> 发现Apply点击不了 --> 随便更改Profile name --> Apply --> Apply and Close

Window --> Preferences --> General --> Editors --> Text Editors --> Background color --> 取消System Default --> Color --> 规定自定义颜色 --> 调整数值（如图） --> 添加到自定义颜色 --> 确定 --> Apply and close

Window --> Preferences --> General --> Appearance --> Theme --> 在下拉列表框中选择自己喜欢的主题背景

Window --> Preferences --> Java --> Editor --> Content Assist --> Auto activation delay 设置为200 (键盘输入到代码提示出现的时间，单位为毫秒) --> Auto activation triggers for Java 将26个英文字母大小写和.都输入(输入后会有提示的字符) --> Apply and Close

有时候把窗体弄得很乱，直接重置 Window --> Perspective --> Reset Perspective…

Window --> Preferences --> Install/Update --> Automatic Update -->取消 Automatically find new updates and notify me

Windows–>Preference–>General–>Appearance–>Editors–>Text Editors–>show line numbers