Print a hexdump of a string

Hexdump.java

package stackoverflow;

public class Hexdump {
  
  public static void main(String[] args) {
    // This is mocked. Get the actual filename
    String filename = "Qwertypsadfksadf";
    // Log the hexdump
    System.out.println(hexdump(filename));
  }
  
  public static String hexdump(String str) {
    StringBuilder builder = new StringBuilder();
    String separator = "";
    for (char c : str.toCharArray()) {
      builder.append(separator).append(Integer.toHexString(c));
      separator = " ";
    }
    return builder.toString();
  }

}