问题:
我有很多日期,我需要按周安排.
问题: 如何按日期的一周对日期进行分组？
示例数据集
Date date = new SimpleDateFormat.parse("04/01/2015")
Date date = new SimpleDateFormat.parse("04/02/2015")
Date date = new SimpleDateFormat.parse("04/03/2015")
Date date = new SimpleDateFormat.parse("04/04/2015")
Date date = new SimpleDateFormat.parse("04/05/2015")
Date date = new SimpleDateFormat.parse("04/06/2015")
Date date = new SimpleDateFormat.parse("04/07/2015")
Date date = new SimpleDateFormat.parse("04/08/2015")
Date date = new SimpleDateFormat.parse("04/09/2015")
期望的输出
HashMap<Date, Date> hashMap = groupByWeek(ArrayList<Date> dates);
printWeeklyGroupedDates();
Week 1:
04/01/2015
04/02/2015
04/03/2015
04/04/2015
04/05/2015
04/06/2015
04/07/2015
Week 2:
04/08/2015
04/09/2015
我试过的
public Date getWhichYearlyWeek(Date date){
Calendar cal …为什么当我使用 jdbc 向数据库中插入数据时，我的表 auto_increments 会被提升。
填充完全空表的示例：
狗桌
DogId DogName
3 Woofer
4 Kujo
5 Spike
所有者表
OwnerId DogID OwnerName
6 3 George
7 4 John
8 5 Sam
期望的结果
狗桌
DogId DogName
1 Woofer
2 Kujo
3 Spike
所有者表
OwnerId DogID OwnerName
1 1 George
2 2 John
3 3 Sam
实际代码：
public void insertStuff(Something d)
{
Connection con = null;
try
{
Class.forName("com.mysql.jdbc.Driver");
con = (Connection) DriverManager.getConnection(
"jdbc:mysql://" + this.getServer() + "/" + this.getDatabase(), user,
password);
con.setAutoCommit(false);
Statement s1 …目标：在 udp 或 tcp 使用其发送方法时更改表单上的图像
问题：我不知道如何正确设置事件、事件处理程序和委托
发送接口
interface ISendData
{
void Send();
}
TCP连接类
//Need some type of delegate??
public class TCPconnection : ISendData
{
void Send()
{
//how invoke/fire a send Event?
}
}
UDP 连接类
//Need some type of delegate??
public class UDPConnection : ISendData
{
void Send()
{
//how invoke/fire a send event?
}
}
“应该”订阅查看已触发事件的 winform
public class myForm
{
private DataWatcher datawatcher = new DataWatcher();
private Image statusIndicator = null;
public myform()
{ …我有一个当前的Mongo数据库,其中包含累积的条目/字段
{
name: "Fred Flintstone",
age : 34,
timeStamp : NumberLong(14283454353543)
}
{
name: "Wilma Flintstone",
age : 33,
timeStamp : NumberLong(14283454359453)
}
等等...
问题:我想将数据库中的所有条目转换为相应的ISODate - 如何做到这一点？
期望的结果:
{
name: "Fred Flintstone",
age : 34,
timeStamp : ISODate("2015-07-20T14:50:32.389Z")
}
{
name: "Wilma Flintstone",
age : 33,
timeStamp : ISODate("2015-07-20T14:50:32.389Z")
}
我尝试过的事情
>db.myCollection.find().forEach(function (document) {
document["timestamp"] = new Date(document["timestamp"])
//Not sure how to update this document from here
db.myCollection.update(document) //?
})
#include <iostream>
#include <getopt.h>
#define no_argument 0
#define required_argument 1
#define optional_argument 2
int main(int argc, char * argv[])
{
std::cout << "Hello" << std::endl;
const struct option longopts[] =
{
{"version", no_argument, 0, 'v'},
{"help", no_argument, 0, 'h'},
{"stuff", required_argument, 0, 's'},
{0,0,0,0},
};
int index;
int iarg=0;
//turn off getopt error message
opterr=1;
while(iarg != -1)
{
iarg = getopt_long(argc, argv, "s:vh", longopts, &index);
switch (iarg)
{
case 'h':
std::cout << "You hit help" << std::endl;
break;
case …我有以下存储过程
DELIMITER ##
CREATE PROCEDURE exportFile()
BEGIN
Select * from Sample
INTO OUTFILE '~/Sample.csv'
FIELDS TERMINATED BY ','
LINES TERMINATED BY '\n';
END ##
DELIMITER ;
ERROR 1086 (HY000): File '~/Sample.csv' already exists
- 这是理所当然的.问题:我该怎么做？
我正在使用操作系统字典文件进行扫描。我正在创建一个java程序，允许用户输入任何字母组合来查找包含这些字母的单词。我该如何使用 grep 命令来做到这一点？
我有以下内容
web.xml中
<error-page>
<error-code>500</error-code>
<location>/WEB-INF/views/errorPages/500.jsp</location>
</error-page>
<error-page>
<exception-type>java.lang.Exception</exception-type>
<location>/WEB-INF/views/errorPages/error.jsp</location>
</error-page>
<error-page>
<exception-type>java.lang.Throwable</exception-type>
<location>/WEB-INF/views/errorPages/500.jsp</location>
</error-page>
弹簧的context.xml
<bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
<property name="exceptionMappings">
<props>
<prop key="java.lang.Exception">error</prop>
</props>
</property>
</bean>
<bean id="exceptionResolver"
class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
<property name="exceptionMappings">
<props>
<prop key="com.company.server.exception.GenericException">GenericExceptionPage</prop>
<prop key="java.lang.Exception">error</prop>
</props>
</property>
<property name="defaultErrorView" value="defaulterror"></property>
</bean>
<bean id="viewResolver"
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix">
<value>/WEB-INF/views/</value>
</property>
<property name="suffix">
<value>.jsp</value>
</property>
</bean>
GenericException.java
public class GenericException extends RuntimeException
{
private static final long serialVersionUID = 1L;
private String customMsg;
public String message;
public String getCustomMsg()
{
return customMsg;
} …我知道如果你想要线程,你可以在java中扩展线程或实现runnable到multithread.但为什么你必须实现java的接口线程？什么是可运行的接口的重要性,使java线程工作？Java的界面是否扩展了什么？
我有一个带有"帮助"上下文菜单的winfrom GUI.点击后,我想打开该应用程序的用户手册.手册是pdf,存储在应用程序资源中.
问题:如何为用户打开此文件？
代码我正在与之合作
System.Diagnostics.Process process = new System.Diagnostics.Process();
bool adobeInstall = false;
RegistryKey adobe = Registry.LocalMachine.OpenSubKey("Software").OpenSubKey("Adobe");
if (adobe != null)
{
RegistryKey acroRead = adobe.OpenSubKey("Acrobat Reader");
if (acroRead != null)
adobeInstall = true;
}
if (adobeInstall == true)
{
///Open the pdf file??
}