is ceaser

import java.util.*;
public class Caesar_Cipher {
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        System.out.println("Enter the plaintext");
        String str=sc.nextLine();
        str.toLowerCase();
        System.out.println("Enter the key");
        int key=sc.nextInt();
        String ciph="";
        char chr[]=str.toCharArray();
        for(int i=0;i<str.length();i++){
            if(chr[i]==' '){
                ciph+=" ";
                continue;
            }
            int t=(int)chr[i]+(key%26);

            chr[i]=(char)t;
            ciph+=chr[i];
        }
        System.out.println("Cipher:"+ciph);
        chr=ciph.toCharArray();
        String deciph="";
        for(int i=0;i<ciph.length();i++){
             if(chr[i]==' '){
                deciph+=" ";
                continue;
            }
            int t=(int)chr[i]-(key%26);
            chr[i]=(char)t;
            deciph+=chr[i];
        }
        System.out.println("Plain Text:"+deciph);
    }
}

/*
OUTPUT

Enter the plaintext

rendezvous at bravo

Enter the key
4

Cipher:    virhi~zsyw ex fvezs
Plain Text :    rendezvous at bravo
*/