Question: I am new to Eclispe. I just met a problem. I copy a piece code from a website into the Eclipse. the IDE editor prompt that: Syntax error on tokens, delete these tokens

I am sure that my code is OK. If I manually input the code, it's ok. I open the java file from Notepad++. I found there are some blank spaces(green highlighted). If I remove the green highlighted blanks, the Eclipse errors is gone.

I post some images. I googled for a while, but I didn't find useful information, so I seek help here.

What are those blank spaces? How to eliminate the error when copying?
Why does this happen? 

[![enter image description here](https://i.stack.imgur.com/HF4UX.jpg)](https://i.stack.imgur.com/HF4UX.jpg)
[![enter image description here](https://i.stack.imgur.com/umPNP.jpg)](https://i.stack.imgur.com/umPNP.jpg)

Answer: 
Please remove red space, and press Tab again.
all the problematic spaces can be quickly removed using the Find/Replace dialog, select one of the red spaces then insert a normal space in the "Replace with" textfield and finally "Replace All"