The code is compiling but it is not giving the expected output.

[dantzig]

import java.util.Scanner;


public class ProjectTools {
	public static void main(String[] args){
		
	        Scanner scan = new Scanner(System.in);
	        System.out.println("Enter the key");
			int key = scan.nextInt();
		
			System.out.println("Enter the text");
			String text = scan.next() ;
			String x = "aa";
			
			String ciphertext = encrypt( text , key);
			System.out.println("ciphertext" + ciphertext);
		}
	private static String encrypt(String str , int key){
		
		if (key < 0)
		{
			key = 26-(-key%26);
		}
		String result = "" ;
		for (int i = 0 ; i<str.length() ; i++){
			char ch = str.charAt(i);
			result+= encryptchar(ch, key);
			
		}
		       return result;
	}
  private static char encryptchar(char ch , int key){
	   if (Character.isUpperCase(ch))
	   {
		 return ((char) ( 'A'+ ((ch-'A'+key)%26)));
		   
	   }
	   return ch ;
	
	  
  }
		
	}

[DarrylBurke]

You forgot to tell us what output you expect, and what you get.

Also, go through Code Conventions for the Java Programming Language: Contents -- your indenting is all over the place.


db

[dantzig]

input:
aaa
output:
aaa
but i expect from my code ddd.

[DarrylBurke]

Describe what you expect your encryptchar(char ch , int key) to return when ch isn't an uppercase letter.

db

[dantzig]

I figure that out.
Thank you.

[dantzig]

The following line should be ( 'A'+ ((ch-'A'+key)%26)));

( 'A'+ ((-6 +ch-'A'+key)%26))); if you plug it in the code it will run, and you can try different inputs.
Thanks.