JAVA判断当前时间是上午am还是下午pm

//结果为“0”是上午 结果为“1”是下午
public class GregorianTest
{
public static void main(String args[])
{
GregorianCalendar ca = new GregorianCalendar();
System.out.println(ca.get(GregorianCalendar.AM_PM));
}
}