java.util.Date date1 = new java.util.Date();
System.out.println(date1.toString()); //结果: Thu Jun 11 16:27:57 CST 2009
//java.sql.Date extends java.util.Date
java.sql.Date date2 = new java.sql.Date(System.currentTimeMillis());
System.out.println(date2.toString()); //结果: 2009-06-11
//日期时间转换成格式化的字符串
SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
//format(java.util.Date date), Timestamp是java.util.Date的子类
String timeStr = sdf.format(stamp1);
System.out.println(timeStr); //结果:2009/06/11 16:52:56