Write a program in java on Crytography?

Answer 1

/*Input: Enter the String: AHFJFJ

* Enter the gap : 2

*Output: CJHLHL

*/

import java.io.*;

class Crypt

{

protected static void main()throws IOException

{

BufferedReader in=new BufferedReader(new InputStreamReader(System.in));

System.out.print("Enter the String: ");

String s=in.readLine(),s1="";

System.out.print("Enter the Gap: ");

short g=Short.parseShort(in.readLine());

for(short i=0;i<s.length();i++)

{

char ch=s.charAt(i);

if(Character.isUpperCase(ch))

{

ch+=g;

if(ch>'Z')

ch-=26;

else if(ch<'A')

ch+=26;

s1+=ch;

}

else if(Character.isLowerCase(ch))

{

ch+=g;

if(ch<'a')

ch+=26;

else if(ch>'z')

ch-=26;

s1+=ch;

}

else if(Character.isDigit(ch))

{

ch+=g;

if(j>'9')

j-=10;

else if(j<'0')

j+=10;

s1+=ch;

}

else

s1+=ch;

}

System.out.print("String: "+s1);

}}