New to Java- implementation question

So I have gotten most of my code written and I have the logic down however i cannot seem to get the program to run...

When I run it, it just runs the program I ran before this one. I will post my code: I believe it has something to do with my class declarations.

import java.util.Scanner;
public class Cipher {
	
	public void run(){
		Scanner sc = new Scanner(System.in);
		int shift = sc.nextInt();
		String plaintext = sc.nextLine();
		String ciphertext = encryptline(plaintext , shift);
		System.out.println(ciphertext);
	}
	
	private String encryptline(String str, int shift){
		String cipher = "";
		for (int i=0 ; i< str.length() ; i++){
			char letter = encryptletter(str.charAt(i) , shift);
			cipher += letter;
		}
		return cipher;
	}
	
	private char encryptletter(char letter, int shift){
		if (Character.isLetter(letter)){
			letter = (char) ('A' + (Character.toUpperCase(letter) - 'A' + shift) % 26);
		}
		return letter;
	}
}

Thanks- as always for your help.