Date conversion to Datetime, String and Date in Java

This conversion is often encountered in projects, and I will briefly explain it:

(1) Convert Date to Datetime

Datetime corresponds to Timestamp in the java database, and the conversion is as follows:

//Convert to Timestamp
		 Date date = new Date();
		 Timestamp timestamp = new Timestamp(()); //2013-01-14 22:45:36.484

(2) Convert String to Date

//Convert String to
		 String str = "2013-01-14";
		 SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
		 Date date = null; //Initialize date
		 try {
			 date = (str); //Mon Jan 14 00:00:00 CST 2013
		 } catch (ParseException e) {
			 ();
		 }

(3) Convert Date to String

//Convert to String
		 Date date = new Date();
		 DateFormat format = new SimpleDateFormat("yyyy-MM-dd");
		 String str = (date); //2013-01-14

(4) String converted to

The purpose of converting to operate on the database

//Convert String to
		 String str = "2013-01-14";
		 SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
		  sdate = null; //Initialization
		 try {
			  udate = (str);
			 sdate = new (()); //2013-01-14
		 } catch (ParseException e) {
			 ();
		 }