ACSII to Character conversion

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Java

Java code to convert char ti ASCII

import java.io.*;
import java.lang.*;

  public class CharToASCII{
     public static void main(String args[]) throws IOException{
       BufferedReader buff =  new BufferedReader(new InputStreamReader(System.in));
       System.out.println("Enter the char:");
       String str = buff.readLine();
       for ( int i = 0; i < str.length(); ++i ){
          char c = str.charAt(i);
          int j = (int) c;
          System.out.println("ASCII OF "+c +" = " + j + ".");
       }
     }
  }

I know how to convert character to ASCII but I am struggling to do vice-versa
How can we convert ASCII number to its character equivalent.

what exactly I want is if input is :- 657578104 ...likewise
Then output should be :- AKNh ...likewise