有以下课程:
public class Member {
private int x;
private long y;
private double d;
public Member(int x, long y, double d) {
this.x = x;
this.y = y;
this.d = d;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + x;
result = (int) (prime * result + y);
result = (int) (prime * result + Double.doubleToLongBits(d));
return result;
}
@Override
public boolean equals(Object obj) {
if (this …Run Code Online (Sandbox Code Playgroud) 我正在收到这个缺失的工件消息
javax.transaction:jta:jar:1.0.1B
as403 Forbidden
Multiple annotations found at this line:
- Missing artifact javax.transaction:jta:jar:1.0.1B
- ArtifactTransferException: Failure to transfer javax.transaction:jta:jar:1.0.1B from http://
repository.jboss.com/maven2 was cached in the local repository, resolution will not be reattempted until
the update interval of jboss has elapsed or updates are forced. Original error: Could not transfer artifact
javax.transaction:jta:jar:1.0.1B from/to jboss (http://repository.jboss.com/maven2): Access denied to
http://repository.jboss.com/maven2/javax/transaction/jta/1.0.1B/jta-1.0.1B.jar. Error code 403, Forbidden
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我pom.xml有:
<repositories>
<repository>
<id>jboss</id>
<url>http://repository.jboss.com/maven2</url>
</repository>
</repositories>
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你能告诉我怎么解决这个问题吗?
我安装了android studio并试图运行简单的项目.
但我发现了奇怪的错误信息:
Waiting for device.
/usr/local/idea/android-studio/sdk/tools/emulator -avd Nexus-4-18-xhdpi -netspeed full -netdelay none
emulator: emulator window was out of view and was recentered
Device connected: emulator-5554
Device is online: emulator-5554
Target device: Nexus-4-18-xhdpi [emulator-5554]
Uploading file
local path: /home/nazar/Documents/coursera-android/Examples/HelloAndroid/out/production/HelloAndroid/HelloAndroid.apk
remote path: /data/local/tmp/course.examples.HelloWorld.HelloWorld
Installing course.examples.HelloWorld.HelloWorld
DEVICE SHELL COMMAND: pm install -r "/data/local/tmp/course.examples.HelloWorld.HelloWorld"
Error: Could not access the Package Manager. Is the system running?
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我无法弄清楚为什么会这样?
我安装了sdk版本并配置了模拟器.有什么建议?
这是模拟器配置:

更新:
我尝试安装Genymotion设备并使用少量虚拟设备,但抓住了:
Waiting for device.
Target device: genymotion-nexus_4___4_4_2___api_19___768x1280-192.168.56.101:5555
Uploading file
local path: /home/nazar/Documents/coursera-android/Examples/HelloAndroid/out/production/HelloAndroid/HelloAndroid.apk
remote path: …Run Code Online (Sandbox Code Playgroud) 我最近在scala并尝试传递一些简单的scala工作表.
IDE是Intellij IDEA社区版和OS Ubuntu 12.04,sbt安装正确.
但它会引发错误 - error: not found: value
OI无法理解为什么会这样:
码:
object session {
1 + 2
def abs(x: Double) = if (x < 0) -x else x <== update this line
def sqrtIter(guess: Double, x: Double): Double =
if (isGoodEnough(guess, x)) guess
else sqrtIter(improve(guess, x), x)
def isGoodEnough(guess: Double, x: Double) =
abs(guess * guess - x) < 0.001
def improve(guess: Double, x: Double) =
(guess + x / guess) / 2
def sqrt(x: Double) …Run Code Online (Sandbox Code Playgroud) 我正在尝试编写一个函数,它将以递归方式查找整数列表中的最大元素.我知道如何在Java中执行此操作,但无法理解如何在Scala中执行此操作.
这是我到目前为止,但没有递归:
def max(xs: List[Int]): Int = {
if (xs.isEmpty) throw new java.util.NoSuchElementException();
else xs.max;
}
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我们如何使用Scala语义递归地找到它.
我看看你什么时候使用git rebase而不是git merge? .
但我想确定在这种情况下选择哪种解决方案:
我想实现一个新功能,master所以我将它分支到一个新的功能分支.
我在功能上做了10次提交,而其他人在Master上做了其他提交.
我的问题是,如果我想将我的分支与Master分开以进行测试,但我需要使用集成的新Master提交来测试它.那么,我应该将Master合并到Feature(而不是Feature to Master,它会在我的测试之前对master进行修改)或者做一个rebase?
我想从DB获取日期并在jsp上显示:
2014年4月2日
代替:
2014-04-02 00:00:00.0
在jsp上我尝试使用c:fmt标签来格式化日期:
<div class="form-group">
<span><fmt:message key="task.start"/></span>
<input class="form-control" id="firstDate" placeholder="<fmt:message key="task.start"/>"
name="start_date-${task.taskId}"
<fmt:formatDate value="${task.startDate}" var="startFormat" type="date" pattern="yyyy-MM-dd"/>
value="${startFormat}"/>
</div>
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在页面上看:

如何将其格式化为yyyy-MM-dd格式?
我试图将脚本从MS SQL Server转换为MySql.
我找不到任何方便的方法来进行这种转换.
我尝试了这个MS SQL Server到MySQL转换在线转换器,但它在语法上有很多错误.
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'IDENTITY(1,1) NOT NULL,
`address` varchar(255) NOT NULL,
`date_added` datetime N' at line 2
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这是我需要转换pastebin脚本的文件的内容