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Operation of the date in Java
Operation in Java .......................................... ................................................ .......... 1
1 Date Template ........................................... ................................................ ..................... 2
2 formatted date .......................................... ................................................ ................... 2
3 get the current date .......................................... ................................................ ............. 3
4 Current time ........................................... ................................................ .....................
5 1 year ago ........................................... ................................................ ..................... 4
6 Tomorrow Date ............................................. ................................................ ..................... 4
7 two times between the days ........................................ ................................................ ......... 4
8 additional half an hour ............................................ ................................................ ...................... 4
9 years of the date of summal delivery .......................................... ................................................ ................. 5
10 Seeking a few days ........................................... ................................................ ................ 5
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11 Java data type conversion ........................................... ................................................ ......... 5
11.1 How to convert a string string into an integer int ...................................... ............................. 5
11.2 How to convert an integer int convert into a string string ...................................... ............................................................................................................................................. ................................................ ...........................................
11.4 Data Type Conversion Function ........................................... ................................................ 7
12 get the serial number plus one ........................................... ................................................ .............. 8
1 Date Template
The template is defined as follows:
Y years, such as 1996
M month, such as July or 07
Di Month Day, such as 12
H hours (24 system), such as 0,17
m minutes, such as 32
s banknote bell, such as 55
S microte banknote, such as 978
E-week, such as Tuesday
D for the year, such as 189
W Week in Year (Number) 27
W Week in Month (Number) 2
A am / pm marker (text) PM
K Hour in Day (1 ~ 24) (Number) 24
K Hour in AM / PM (0 ~ 11) (Number) 0
Z Time Zone (Text) Pacific Standard Time
'escape for text (Delimiter)
'' Single Quote (Literal) '
2 formatted date
Using the SimpleDateFormat class formatted date, if the date format is wrong, an exception is generated.
Import java.text. *;
Import java.util. *;
Public class testdate {
Public static void main (String [] args) {
String DSTR = "2001.12.12-08.23.21";
Date D = NULL;
SimpleDateFormat SDF = New SimpleDateFormat ("YYYY.MM.DD- HH.MM.SS");
Try {
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D = SDF.PARSE (DSTR);
} catch (parseException pe) {
System.out.println (pe.getMessage ());
}
System.out.println (d);
System.out.println (d.gettime ());
}
}
Find the SimpleDateFormat class in the java.text package, give it a template, you can parse into a Date, then use DATE
The geTITME () method of the class can get a long data.
3 get the current date
Public string getdatetime ()
{
Calendar Cal = Calendar.getInstance ();
SimpleDateFormat Formatter = New SimpleDateFormat ("YYYY- MM-DD HH: MM: SS"); string mdatetime = formatter.format (Cal.getTime ());
Return (MDATETIME);
}
Public java.sql.date getdate ()
{
Java.sql.date mdate;
Calendar Cal = Calendar.getInstance ();
SimpleDateFormat Formatter = New SimpleDateFormat ("YYYY- MM-DD HH: MM: SS");
String mdatetime = formatter.format (caver.gettime ());
Return (java.sql.date.valueof (mdatetime));
}
4 current time
Calendar Cal = Calendar.getInstance ();
// simpledateformat formatter = new SimpleDateFormat ("YYYY-MM-DD HH: MM: SS");
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SimpleDateFormat Formatter = New SimpleDateFormat ("YYYY-MM-DD HH: MM: SS G E D f W W A E f");
String mdatetime = formatter.format (caver.gettime ());
Out.println (MDATETIME);
Out.println ("
");
5 1 year ago
Java.util.date mydate = new java.util.date ();
Long myTime = (mydate.gettime () / 1000) -60 * 60 * 24 * 365;
mydate.settime (MyTime * 1000);
String mdate = formatter.format (mydate);
Out.println (MDATE);
Out.println ("
");
6 tomorrow
mydate = new java.util.date ();
MyTime = (mydate.gettime () / 1000) 60 * 60 * 24;
mydate.settime (MyTime * 1000);
MDATE = formatter.format (mydate);
Out.println (MDATE);
Out.println ("
");
7 days between two times
SimpleDateFormat MyFormatter = New SimpleDateFormat ("YYYY-MM-DD");
Java.util.date date = myformatter.parse ("2003-05-1");
Java.util.date mydate = myFormatter.Parse ("1899-12-30");
Long day = (Date.getTime () - mydate.gettime ()) / (24 * 60 * 60 * 1000);
Out.println (DAY);
Out.println ("
");
8 additional half an hour
SimpleDateFormat Format = New SimpleDateFormat ("YYYY-MM-DD HH: MM: SS"); java.util.date date1 = format.parse ("2002-02-28 23:16:00);
Long Time = (Date1.gettime () / 1000) 60 * 30;
Date1.settime (Time * 1000);
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String mydate1 = formatter.format (date1);
Out.println (MyDate1);
Out.println ("
");
9 months
SimpleDateFormat Formatter2 = New SimpleDateFormat ("YYYY-MM F E");
Java.util.date Date2 = formatter2.parse ("2003-05 5 Friday");
SimpleDateFormat Formatter3 = New SimpleDateFormat ("YYYY-MM-DD");
String mydate2 = formatter3.Format (date2);
Out.println (mydate2);
Out.println ("
");
10 Seeking the week
mydate = myformatter.parse ("2001-1-1");
SimpleDateFormat Formatter4 = New SimpleDateFormat ("E");
String mydate3 = formatter4.format (mydate);
Out.println (MyDate3);
Out.println ("
");
11 Java data type conversion
11.1 How to convert a string string into an integer INT
1). INT i = integer.parseint ([string]); or
I = integer.parseint ([String], [INT RADIX]);
2). INT i = integer.valueof (my_str) .intValue ();
Note: The string is transformed into Double, Float, and long.
11.2 How to convert an integer Int into a string string String
A. Have a variety of methods:
String s = String.Valueof (i);
2.) String s = integer.tostring (i);
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3.) String s = "" i;
Note: Double, Float, long-converted to string is similar.
11.3 examples
Package cn.com.lwkj.rts.Register;
Import java.sql.date;
Public class typechange {
Public typechange () {
}
// Change the string type to the int TYPE
Public Static int StringToint (String IntStr)
{
Integer integer;
Integer = integer.valueof (INTST);
Return Integer.intValue ();
}
// Change int Type to the string typepublic static string INTSTOSTRING (INT VALUE)
{
Integer Integer = New Integer (Value);
Return integer.toString ();
}
// Change the string type to the float type
Public static float stringtofloat (String floatstr)
{
Float floatee;
FLOATEE = float.valueof (floatstr);
Return floatee.floatvalue ();
}
// Change the float type to the string type
Public Static String floattostring (Float Value)
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{
Float floatee = new float (value);
Return floatee.tostring ();
}
// Change the string type to the sqldate type
Public static java.sql.date stringtodate (String DateStr)
{
Return java.sql.date.valueof (dateStr);
}
// change the sqldate type to the string type
Public Static String DateTString (java.sql.date datee)
{
Return Datee.toString ();
}
Public static void main (string [] args)
{
Java.sql.date day;
Day = TypeChange.StringTodate ("2003-11-3");
String strday = typechange.datetostring (day);
System.out.println (strDay);
}
}
11.4 Data Type Conversion Function
Data type conversion function in Java
Although it can be found in the Java API, make a backup.
String-> Byte
Byte Static Byte ParsebyTe (String S)
BYTE-> STRING
Byte Static String Tostring (byte b)
Char-> string
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Character Static String to String (Char C)
String-> short
Short Static Short Parseshort (String S)
Short-> string
Short Static String Tostring (SHORT S)
String-> Integer
Integer Static Int PaSeint (String S)
Integer-> String
Integer Static String Tostring (INT i)
String-> long
Long Static Long Parselong (String S)
Long-> String
Long Static String Tostring (long i)
String-> float
Float Static Float Parsefloat (String S)
FLOAT-> String
Float static string toString (float f) String-> DOUBLE
Double Static Double Parsedouble (String S)
Double-> String
Double Static String Tostring (double)
12 get the serial number plus one
Public int getMaxid (String Vtablename, String VfieldName)
{
INT mResult = 0;
Boolean mconn = true;
String msql = new string ();
MSQL = "SELECT MAX (" vfieldname ") 1 as maxid from" vtablename
Try
{
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IF (conn! = null) {
Mconn = conn.isclosed ();
}
IF (mconn) {
OpenConnection ();
}
ResultSet Result = ExecuteQuery (MSQL);
IF (result.next ())
{
MRESULT = Result.Getint ("MaxID");
}
Result.close ();
IF (MCONN)
{
CloseConnection ();
}
}
Catch (Exception E)
{
System.out.println (E.TOString ());
}
Return (MRESULT);
}
MDocumentId = dbaobj.getmaxid ("Document", "DocumentID");
