Eclipse syntax error on tokens, delete these tokens

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?

Answer 1

Please remove red space, and press Tab again.