如何获得Windows系统的时间

从以下例子可以得到启示

public class CurrentTime {
	public CurrentTime(){
	 	Calendar p_cal = Calendar.getInstance();
	 	int p_year = p_cal.get(Calendar.HOUR);
	 	int p_minute = p_cal.get(Calendar.MINUTE);
	 	int p_second = p_cal.get(Calendar.SECOND);
	 	
	 	System.out.println("Current time: " + p_year + ":" + p_minute + ":" + p_second);
	}
	public static void main(String[] arg){
		new CurrentTime();
	}
}