java.util.Date、java.sql.Date、java.sql.Time、java.sql.Timestamp区别和联系
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java.util.Date、java.sql.Date、java.sql.Time、java.sq
demo;
import java.sql.Timestamp;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
public class TestData {
public static void main (String[] args) throws ParseException {
Date d = new Date( new Date().getTime());
SimpleDateFormat sdf = new SimpleDateFormat( "yyyy-MM-dd HH:mm:ss" );
String nowday1 = "2015-5-12 10:30:12" ;
String nowday2 = "2015-05-12 10:30:12" ;
Timestamp tt = new Timestamp(System.currentTimeMillis());
System.out.println(sdf.format(d)); //Date -> String
System.out.println(sdf.parse(nowday1)); // String -> Date
System.out.println(sdf.format(tt)); // Timestamp -> String
System.out.println(tt.valueOf(nowday2)); //String -> Timestamp ：String的类型必须形如： yyyy-mm-dd hh:mm:ss[.f...] 这样的格式，中括号表示可选，否则报错
System.out.println(d=tt); // Timestamp -> Date 因为是父类直接向上转型
System.out.println( new Timestamp(d.getTime())); // Date ->Timestamp
}
}
/*
* oracle中Date与Timestamp转换
* SELECT TO_TIMESTAMP(TO_CHAR(SYSDATE, ‘YYYY-MM-DD HH24:MI:SS‘), ‘YYYY-MM-DD HH24:MI:SS‘) FROM dual;
* SELECT TO_DATE(TO_CHAR(TO_TIMESTAMP(TO_CHAR(SYSDATE, ‘YYYY-MM-DD HH24:MI:SS‘), ‘YYYY-MM-DD HH24:MI:SS‘),‘YYYY-MM-DD HH24:MI:SS‘),‘YYYY-MM-DD HH24:MI:SS‘) FROM dual;
*
*
*/
/**
2015-05-12 10:44:15
Tue May 12 10:30:12 CST 2015
2015-05-12 10:44:15
2015-05-12 10:30:12.0
2015-05-12 10:44:15.108
2015-05-12 10:44:15.108
**/
$(function () {
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});
});
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