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Do you want to run Java programs, do you want to develop Java programs, or do you want a Java Runtime Environment (JRE) on a server? If you want to run Java programs, but not develop them, download the JRE. If you want to develop Java applications, download the Java Development Kit, or JDK. The JDK includes the JRE, so you do not have to download both separately. If you need the JRE on a server and do not want the ability to run RIAs, download the Java SE Server JRE. This version of the Java SE Server JRE does not include the Java plug-in or Java Web Start support, additional tools might be removed from future versions.

Java jdk 1.7 download free download. JavaQemu JavaQemu is a Graphical User Interface Front End for QEMU, written in Java. JavaQemu works with JRE. This section provides a tutorial example on how to download and install JDK 1.7.0 (Java SE 7) on a Windows XP system. A simple Java program was entered, compiled, and executed with the new JDK installation. Nov 18, 2017 Java - Download & Install JDK 1.7 on Windows 3 minute read Java is a computer programming language that is concurrent, class-based and object-oriented. It was originally developed by James Gosling at Sun Microsystems. Java applications are compiled to bytecode (class file) that can run on any Java virtual machine (JVM) regardless of computer. Installing java for casual java developers has always been something of a minefield. Do we need SE or EE edition for say STS/Grails, do we need the SDK or JDK? I am pretty sure I need the JDK 1.7 for EE edition. The question is, how do I get the JDK without the bloated SDK?

We support the following platforms:

For supported processors and browsers, see Oracle JDK 7 and JRE 7 Supported Systems Configurations.

For a list of changes made to the JDK and JRE installers, see Installer Enhancements in JDK 7.

Oracle Solaris Operating System

• JDK 7 Installation on the Oracle Solaris OS - both 32-bit and 64-bit
• JRE 7 Installation on the Oracle Solaris OS - both 32-bit and 64-bit
• Server JRE 7 Installation on the Oracle Solaris OS - 64-bit

In order to run Java applets within a browser, you must install the JRE plugin manually. This does not apply to the Server JRE.

Microsoft Windows

• Windows System Requirements for JDK and JRE - Describes minimum processor, disk space, and memory requirements for the JDK and JRE for Microsoft Windows
• JDK Installation for Microsoft Windows - Describes how to install the JDK on 32-bit and 64-bit Microsoft Windows operating systems
• JRE Installation for Microsoft Windows - Describes how to install the JRE on 32-bit and 64-bit Microsoft Windows operating systems
• Server JRE Installation for Microsoft Windows - Describes how to install the Server JRE on 64-bit Microsoft Windows operating systems
• Online Installation and Java Update FAQ - Lists frequently asked questions for Windows online installation of the JRE as well as for Java Update
• JRE Installer Options - Describes how to install the JRE silently through command-line options
• Patch-in-Place and Static JRE Installation - Describes how to install the JRE in a patch-in-place or static configuration.
• Java SE Runtime Environment Update Scenarios - Describes various scenarios to demonstrate the behavior of the JRE update process.
• Autodownload Files - Lists various JRE releases and the .cab files that can be used for autodownloading them.

Linux

• JDK 7 Installation on Linux Platforms - both 32-bit and 64-bit, including RPM
• JRE 7 Installation on Linux Platforms - both 32-bit and 64-bit, including RPM
• Server JRE 7 Installation on Linux Platforms - 64-bit

In order to run Java applets within a browser, you must install the JRE plugin manually. This does not apply to the Server JRE.

Mac

The installation of JRE and JDK of 7u6 or later require Mac OS X 10.7.3 (Lion) or later.

SimpleDateFormat is a concrete class for formatting and parsing dates in a locale-sensitive manner. It allows for formatting (date → text), parsing (text → date), and normalization.

SimpleDateFormat allows you to start by choosing any user-defined patterns for date-time formatting. However, you are encouraged to create a date-time formatter with either getTimeInstance, getDateInstance, or getDateTimeInstance in DateFormat. Each of these class methods can return a date/time formatter initialized with a default format pattern. You may modify the format pattern using the applyPattern methods as desired. For more information on using these methods, see DateFormat.

Date and Time Patterns

Date and time formats are specified by date and time pattern strings. Within date and time pattern strings, unquoted letters from 'A' to 'Z' and from 'a' to 'z' are interpreted as pattern letters representing the components of a date or time string. Text can be quoted using single quotes (') to avoid interpretation. '' represents a single quote. All other characters are not interpreted; they're simply copied into the output string during formatting or matched against the input string during parsing.

Risk Matrix

The following pattern letters are defined (all other characters from 'A' to 'Z' and from 'a' to 'z' are reserved):

Letter	Date or Time Component	Presentation	Examples
G	Era designator	Text	AD
y	Year	Year	1996; 96
Y	Week year	Year	2009; 09
M	Month in year (context sensitive)	Month	July; Jul; 07
L	Month in year (standalone form)	Month	July; Jul; 07
w	Week in year	Number	27
W	Week in month	Number	2
D	Day in year	Number	189
d	Day in month	Number	10
F	Day of week in month	Number	2
E	Day name in week	Text	Tuesday; Tue
u	Day number of week (1 = Monday, ..., 7 = Sunday)	Number	1
a	Am/pm marker	Text	PM
H	Hour in day (0-23)	Number	0
k	Hour in day (1-24)	Number	24
K	Hour in am/pm (0-11)	Number	0
h	Hour in am/pm (1-12)	Number	12
m	Minute in hour	Number	30
s	Second in minute	Number	55
S	Millisecond	Number	978
z	Time zone	General time zone	Pacific Standard Time; PST; GMT-08:00
Z	Time zone	RFC 822 time zone	-0800
X	Time zone	ISO 8601 time zone	-08; -0800; -08:00

Pattern letters are usually repeated, as their number determines the exact presentation:

• Text: For formatting, if the number of pattern letters is 4 or more, the full form is used; otherwise a short or abbreviated form is used if available. For parsing, both forms are accepted, independent of the number of pattern letters.
  
• Number: For formatting, the number of pattern letters is the minimum number of digits, and shorter numbers are zero-padded to this amount. For parsing, the number of pattern letters is ignored unless it's needed to separate two adjacent fields.
  
• Year: If the formatter's Calendar is the Gregorian calendar, the following rules are applied.
  
  • For formatting, if the number of pattern letters is 2, the year is truncated to 2 digits; otherwise it is interpreted as a number.
  • For parsing, if the number of pattern letters is more than 2, the year is interpreted literally, regardless of the number of digits. So using the pattern 'MM/dd/yyyy', '01/11/12' parses to Jan 11, 12 A.D.
  • For parsing with the abbreviated year pattern ('y' or 'yy'), SimpleDateFormat must interpret the abbreviated year relative to some century. It does this by adjusting dates to be within 80 years before and 20 years after the time the SimpleDateFormat instance is created. For example, using a pattern of 'MM/dd/yy' and a SimpleDateFormat instance created on Jan 1, 1997, the string '01/11/12' would be interpreted as Jan 11, 2012 while the string '05/04/64' would be interpreted as May 4, 1964. During parsing, only strings consisting of exactly two digits, as defined by Character.isDigit(char), will be parsed into the default century. Any other numeric string, such as a one digit string, a three or more digit string, or a two digit string that isn't all digits (for example, '-1'), is interpreted literally. So '01/02/3' or '01/02/003' are parsed, using the same pattern, as Jan 2, 3 AD. Likewise, '01/02/-3' is parsed as Jan 2, 4 BC.
  Otherwise, calendar system specific forms are applied. For both formatting and parsing, if the number of pattern letters is 4 or more, a calendar specific long form is used. Otherwise, a calendar specific short or abbreviated form is used.
  If week year 'Y' is specified and the calendar doesn't support any week years, the calendar year ('y') is used instead. The support of week years can be tested with a call to getCalendar().isWeekDateSupported().
  
• Month: If the number of pattern letters is 3 or more, the month is interpreted as text; otherwise, it is interpreted as a number.
  
  • Letter M produces context-sensitive month names, such as the embedded form of names. Letter M is context-sensitive in the sense that when it is used in the standalone pattern, for example, 'MMMM', it gives the standalone form of a month name and when it is used in the pattern containing other field(s), for example, 'd MMMM', it gives the format form of a month name. For example, January in the Catalan language is 'de gener' in the format form while it is 'gener' in the standalone form. In this case, 'MMMM' will produce 'gener' and the month part of the 'd MMMM' will produce 'de gener'. If a DateFormatSymbols has been set explicitly with constructor SimpleDateFormat(String,DateFormatSymbols) or method setDateFormatSymbols(DateFormatSymbols), the month names given by the DateFormatSymbols are used.
  • Letter L produces the standalone form of month names.
  
  
• General time zone: Time zones are interpreted as text if they have names. For time zones representing a GMT offset value, the following syntax is used: Hours must be between 0 and 23, and Minutes must be between 00 and 59. The format is locale independent and digits must be taken from the Basic Latin block of the Unicode standard.

  For parsing, RFC 822 time zones are also accepted.
  

• RFC 822 time zone: For formatting, the RFC 822 4-digit time zone format is used: TwoDigitHours must be between 00 and 23. Other definitions are as for general time zones.

  For parsing, general time zones are also accepted.

• ISO 8601 Time zone: The number of pattern letters designates the format for both formatting and parsing as follows: Other definitions are as for general time zones or RFC 822 time zones.

  For formatting, if the offset value from GMT is 0, 'Z' is produced. If the number of pattern letters is 1, any fraction of an hour is ignored. For example, if the pattern is 'X' and the time zone is 'GMT+05:30', '+05' is produced.

  For parsing, 'Z' is parsed as the UTC time zone designator. General time zones are not accepted.

  If the number of pattern letters is 4 or more, IllegalArgumentException is thrown when constructing a SimpleDateFormat or applying a pattern.

SimpleDateFormat also supports localized date and time pattern strings. In these strings, the pattern letters described above may be replaced with other, locale dependent, pattern letters.

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SimpleDateFormat does not deal with the localization of text other than the pattern letters; that's up to the client of the class.

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Examples

The following examples show how date and time patterns are interpreted in the U.S. locale. The given date and time are 2001-07-04 12:08:56 local time in the U.S. Pacific Time time zone.

Cached

Date and Time Pattern	Result
'yyyy.MM.dd G 'at' HH:mm:ss z'	2001.07.04 AD at 12:08:56 PDT
'EEE, MMM d, 'yy'	Wed, Jul 4, '01
'h:mm a'	12:08 PM
'hh 'o'clock' a, zzzz'	12 o'clock PM, Pacific Daylight Time
'K:mm a, z'	0:08 PM, PDT
'yyyyy.MMMMM.dd GGG hh:mm aaa'	02001.July.04 AD 12:08 PM
'EEE, d MMM yyyy HH:mm:ss Z'	Wed, 4 Jul 2001 12:08:56 -0700
'yyMMddHHmmssZ'	010704120856-0700
'yyyy-MM-dd'T'HH:mm:ss.SSSZ'	2001-07-04T12:08:56.235-0700
'yyyy-MM-dd'T'HH:mm:ss.SSSXXX'	2001-07-04T12:08:56.235-07:00
'YYYY-'W'ww-u'	2001-W27-3

Java Jdk 1.7

Synchronization

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Date formats are not synchronized. It is recommended to create separate format instances for each thread. If multiple threads access a format concurrently, it must be synchronized externally.