JavaDoc解析
- A Scanner breaks its input into tokens using a delimiter pattern, which by default matches whitespace.
- next(): Finds and returns the next complete token from this scanner.
- nextLine(): Advances this scanner past the current line and returns the input that was skipped.
next()：next方法是根据空白字符分割，遇到空白字符即返回
nextLine()：nextLine方法是根据换行符分割，并且会包括除换行符外的空白字符。
示例
Scanner sc = new Scanner(System.in);
//加入输入的是:aaa bbb ccc
String s1=sc.next();
//s1="aaa"
String s2=sc.nextline();
//s2=" bbb ccc"