関連ワード:  java replace all whitespace with single space    java replace all whitespace with underscore    java replace all spaces with nothing    java replace all spaces with one space    java replace all whitespace    java replace all whitespace in string    java replace all whitespace and newlines    java replace all whitespace characters    java string replace all spaces with underscore    java replace all double spaces with single space  
結果 : java replace all whitespace with underscore