java convert hex to decimal

1public class ConvertHexToDecimal
2{
3   public static void main(String[] args)
4   {
5      String strHex = "b";
6      int decimal = Integer.parseInt(strHex, 16);
7      System.out.println("Decimal number : " + decimal);
8   }
9}

1import java.util.Scanner;
2public class BinaryToDecimalDemo 
3{
4   public static void main(String[] args) 
5   {
6      int number, decimal = 0, a = 0;
7      Scanner sc = new Scanner(System.in);
8      System.out.println("Please enter binary number: ");
9      String strBinary = sc.nextLine();
10      number = Integer.parseInt(strBinary);
11      while(number != 0){
12         decimal += (number % 10) * Math.pow(2, a);
13         number = number / 10;
14         a++;
15      }
16      System.out.println("Decimal number: " + decimal);
17      sc.close();
18   }
19}