2진법이 10진법으로 바뀌다

public class BinToDec {

  public static void main(String[] args) {
    System.out.println(getDecimal(10));
    System.out.println(getDecimal(101));    
    System.out.println(getDecimal(1000));
    System.out.println(getDecimal(1001));
    System.out.println(getDecimal(10000));
  }

  /**
   *             
   * @param binary
   * @return
   */
  public static int getDecimal(int binary) {
    if (binary < 2) {
      return binary;
    } else {
      return 2 * getDecimal(binary / 10) + binary % 10;
    }
  }
}