Конвернтация char в int

public class Ann {
    public static void main(String[] args) throws java.io.IOException{
      char ch = (char) System.in.read();
      System.out.println("В Char: " + ch);
      System.out.println("В Int: " + (int)ch);
    }
}

ch - '0'

package com.sevak_avet.Test;
 
public class Test {
    public static void main(String[] args) {
        char c = '1';
        System.out.println(c - '0');
    }
}

public static void main(String[] args) throws java.io.IOException {
        char ch = (char) System.in.read();
        System.out.println("В Char: " + ch);
        System.out.println("В Int: " + Integer.parseInt(ch + ""));
    }

package com.sevak_avet.Test;
 
public class Test {
    public static void main(String[] args) throws java.io.IOException {
        char ch = (char) System.in.read();
        System.out.println("В Char: " + ch);
        System.out.println("В Int: " + (ch - '0'));
    }
}

Character.getNumericValue(char);