java使用GregorianCalendar类获得当前的时间和日期

import java.awt.*;
import java.util.GregorianCalendar;

public class Gregorian extends Frame {
	public static void main(String[] args) {
		Gregorian gr = new Gregorian();// 创建框架对象
		TextArea ta = new TextArea();// 文本区域对象
		GregorianCalendar gc = new GregorianCalendar();// 日历时钟
		ta.append("Year:" + gc.get(GregorianCalendar.YEAR) + "\n");// 年
		ta.append("Month:" + gc.get(GregorianCalendar.MONTH) + "\n");// 月
		ta.append("Day:" + gc.get(GregorianCalendar.DATE) + "\n");// 日
		ta.append("Hour:" + gc.get(GregorianCalendar.HOUR) + "\n");// 时
		ta.append("Minute:" + gc.get(GregorianCalendar.MINUTE) + "\n");// 分
		ta.append("Second:" + gc.get(GregorianCalendar.SECOND) + "\n");// 秒
		gr.add(ta, BorderLayout.CENTER);// 文本区域加入到框架中心，用边界布局
		gr.setSize(300, 200);
		gr.setVisible(true);
	}
}