古罗马皇帝凯撒加密军事情报

程序源代码：

//邵文政 20142894 2015 10 22
public class Keys {
public static void main(String[] args) {
String qkeys="qweqwewqefdf DSDSFdggr";
int lengths;
char c ;

lengths=qkeys.length();
System.out.println("解密后的结果是：");
for(int i=0;i<lengths;i++)
{

   if('a'<=qkeys.charAt(i)&&qkeys.charAt(i)<='w')
   {
             c= (char)(qkeys.charAt(i)+3);
             System.out.println(c);
   }
  else if('x'<=qkeys.charAt(i)&&qkeys.charAt(i)<='z')
    {
            c=(char) (qkeys.charAt(i)-23);
            System.out.println(c);
    }
  else if(qkeys.charAt(i)==' ')
   {
      c=qkeys.charAt(i);
      System.out.println(c);
   }
     else if('A'<=qkeys.charAt(i)&&qkeys.charAt(i)<='W')
   {
         c=(char) (qkeys.charAt(i)+3);
         System.out.println(c);
   }
   else if('X'<=qkeys.charAt(i)&&qkeys.charAt(i)<='Z')
   {
      c=(char) (qkeys.charAt(i)-23);
      System.out.println(c);
  }
   else
   {
      System.out.println("请您输入不含数字及特殊字符的字符串！");
     break;
    }
  }

 }

}