一、点击某一代码时，让相同代码高亮显示(Eclipse默认是这样的)
Window ->preferences ->Java ->Editor ->Mark Occurrences
勾选复选框 Mark occurrences of the selected element in the current file
二、改变高亮颜色
Window -> preferences -> General -> Editors -> Text Editors -> Annotations
右边列表选择Occurrences，点击Color设置高亮背景颜色。
原文：https://www.cnblogs.com/JeasonIsCoding/p/9847730.html