学习案例1

输入一个字母，
做如下输出


例如输入F


F

EFE

DEFED

CDEFEDC

BCDEFEDCB

ABCDEFEDCBA

import java.util.*;
class  Demo15
{
public static void main(String[] args) 
{   Scanner s =new Scanner(System.in);
System.out.print("请输入一个大写字母:");
String j =s.next();
char x = j.charAt(0);
                int o = x-64;
for (int a = o;a > 0 ;a-- )
{
for (int d = o;d>a ;d--)
        {  char m = (char)(a-d+o+64);
System.out.print(m);
}
 for (int c = o;c>a-1;c-- )
 { char n = (char)(c+64);
 System.out.print(n);
 }

 
                System.out.println();
}

}
}