Java String~toLowerCase & toUpperCase

import java.lang.String;
import java.util.Scanner;
public class Main{
    public static void main(String[] args){
        Scanner cin=new Scanner(System.in);
        String s=cin.next();

        System.out.format("%s\n",s.toLowerCase());  //全部转为小写
        System.out.format("%s\n",s.toUpperCase());

    }
}