//用Scanner读入字符串,加个判断就可以了
publicstaticvoidmain(String[]args){
Scanners=newScanner(System.in);
Stringsex=s.next();
if(sex.toLowerCase().equals("m"))
System.out.println("男性");
elseif(sex.toLowerCase().equals("n"))
System.out.println("女性");
else
System.out.println("未知");
}