Date 时间函数的使用

package date;import java.util.Date;public class Test01 {public static void main(String[] args) {Date d = new Date();System.out.println(d);//如果不传值就返回一个系统当前时间//传一个long类型的值，也就是自定义值long t = 45642312;Date t1 = new Date(t);System.out.println(t1); long tt = System.currentTimeMillis();Date tt1 = new Date(tt);t1.setTime(tt);System.out.println(tt1); //System.out.println(before());System.out.println(t1.getTime());System.out.println(d.getTime());}}