how to change the color of eclipse code example

Example 1: change color of eclipse editor

Go to Window > Preferences, then navigate to General 
> Editors > Text Editors. In the panel on the right,
from the Appearance color options list select Background 
color, then use the color picker to choose the desired 
color (the System default checkbox must be unchecked).

Example 2: change font color eclipse

Window > Preferences > Java > Editor > Syntax Coloring