[置顶] Eclipse显示空格，Tab，回车和行号

1.空格，Tab和回车

Window——>Preferences——>General——>Editors——>Text Editors——>Show whitespace characters，打勾即可显示空格符和回车符。

2.行号

Window——>Preferences——>General——>Editors——>Text Editors——>Show line numbers，打勾即可显示行号。