Java Data Type - 如何获得一整年的月份的月号

import java.util.Calendar;
import java.util.Date;

public class Main {
  public static void main(String[] argv) {
    System.out.println(getMonth(new Date()));
  }

  public static Integer getMonth(Date date) {
    if (date == null)
      return 0;
    Calendar cal = Calendar.getInstance();
    cal.setTime(date);
    return cal.get(Calendar.MONTH);
  }
}