Convert decimal integer to binary string

ToBinary.java

public class ToBinary {

  /**
   * Converts a positive integer to binary.
   *
   * @param decimal Decimal number.
   * @return Binary string. 
   */
  public static String binary(int decimal) {

    // See - https://www.youtube.com/watch?v=XdZqk8BXPwg

    if (decimal <= 0)
      return String.valueOf(decimal);

    String        next;
    StringBuilder builder;

    builder = new StringBuilder();

    while (decimal >= 1) {

      next = decimal % 2 == 0 ? "0" : "1";

      builder.insert(0, next);

      decimal /= 2;
    }

    return builder.toString();
  }

//------------------------------------------------------------------------------

  public static void main(String[] args) {

    System.out.println(binary(Integer.parseInt(args[0])));
 }

}