I need to create a simple java program for the problem below with program notes

Question

I need to create a simple java program for the problem below with program notes to help me see what is happening in each step:

Create a Java program to decrypt the following text using a simple Substitution Cipher (Caesar Cipher, nothing fancy). Submit the completed .java program as your assignment. The program should take the text below (hard coded or as input), and a shift value as input.

Hints:
(int) will return the ascii value of a letter. Example: A turns into 65
(char) will return the character value of a number. Example: 65 turns into A

WKHQHZRUNLQJDQGFBEHUVHFXULWBGHSDUWPHQWDWURVHVWDWHF ROOHJHRIIHUVDFHUWLILFDWHSURJUDPLQLQIRUPDWLRQVHFXULWBDW DOOIHGHUDOWUDLQLQJOHYHOVWKHSURJUDPFHUWLILHVWKHVWXGH QWVVDWLVIBLQJSURJUDPUHTXLUHPHQWVDUHWUDLQHGWRWKHIHGH UDOQVWLVVLFQVVLVWDQGDUGVIRULQIRUPDWLRQVBVWHPVVHFXUL WBSURIHVVLRQDOVGHVLJQDWHGDSSURYLQJDXWKRULWLHVLQIRUPD WLRQVBVWHPVHFXULWBRIILFHUVVBVWHPVFHUWLILHUVDQGULVNDQ DOBVWUHVSHFWLYHOB

Explanation / Answer

please rate - thanks

the correct key is 3

import java.util.*;
public class decrypt
{
public static void main(String[] args)
{String input="WKHQHZRUNLQJDQGFBEHUVHFXULWBGHSDUWPHQWDWURVHVWDWHF ROOHJHRIIHUVDFHUWLILFDWHSURJUDPLQLQIRUPDWLRQVHFXULWBDW DOOIHGHUDOWUDLQLQJOHYHOVWKHSURJUDPFHUWLILHVWKHVWXGH QWVVDWLVIBLQJSURJUDPUHTXLUHPHQWVDUHWUDLQHGWRWKHIHGH UDOQVWLVVLFQVVLVWDQGDUGVIRULQIRUPDWLRQVBVWHPVVHFXUL WBSURIHVVLRQDOVGHVLJQDWHGDSSURYLQJDXWKRULWLHVLQIRUPD WLRQVBVWHPVHFXULWBRIILFHUVVBVWHPVFHUWLILHUVDQGULVNDQ DOBVWUHVSHFWLYHOB";
String decrypt;
char ch;
int i,key,v;
Scanner in=new Scanner(System.in);
System.out.print("Enter the key to use ");
key=in.nextInt();
decrypt="";
System.out.print("decrypted message: ");
for(i=0;i<input.length();i++)
     {v=(input.charAt(i)-'A'-key)%26+'A';
        if(v<'A')           //need to wrap around
               v+=26;   
       ch=(char)(v);
       decrypt+=ch;     
     }
    System.out.println(decrypt);
}
}

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