Demo: char

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Scanner;
import java.util.stream.Collectors;

public class Demo {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        char symbol = '$';
        System.out.println((int) symbol); //36

        int number = 65;
        System.out.println((char) number); //'А'


        System.out.println('A' + 'B');         //131
        System.out.println("" + 'a' + 'b');   //"ab"
    }

}