methods

问题 in this case I create a sqlite3 object in the main file of my script: $db = new sqlite3('file.sqlite'); now I need to access the sqlite file in different other methods of other classes. But what is the best way to access the object there? Create every time a new object? Use in the methode global? global $db; Or deliver it as argument? $object = new exampleClass($db); 回答1: Definitely: $object = new exampleClass($db); Or it is possible to use a registry class to store objects and then retrieve

问题 I have a problem with call of one MainWindow function from another windows. I have 4 windows: MainWindow, Window1, Window2 and Window3. MainWindow open Window1, Window1 open window2 and Window2 open Window3. I want to call MainWindow function from Window1 and Window3. I can call this function from Window1 but i don't know how to do this from Window3. Code: call MainWindow function from Window1: MainWindow: private void button2_Click(object sender, RoutedEventArgs e) { Window1 w1 = new Window1

问题 i am getting a string as parameter in an NSTread now i have to pass this string to next method so how can i do it? my code is given below: calling method and passing an object [self friendPic:user.userId]; my NSTread is this -(void)friendPic:(NSString *)friendID{ NSThread *thread = [[NSThread alloc] initWithTarget:self selector:@selector(getFriendPic) object:friendID]; [thread start]; [thread release]; } -(void)getFriendPic:(NSString *)_friendID{ NSAutoreleasePool *pool = [[NSAutoreleasePool

问题 I'm a noob to android. and I am getting an illegal argument exception when working with a SQLite table. The logcat indicated that this was due to my cursor not being closed so i closed all my cursors. Now i am still getting the IllegalArgumentException with no detail message and my logcat isn't showing any error messages just debug and warning messages. Without any error messages to point me in the right direction i don't know how to even begin to fix this issue. Any help is greatly

问题 This question already has an answer here : Using special auto start servlet to initialize on startup and share application data (1 answer) Closed 4 years ago . How to call a Java method while deploying a WAR 回答1: It's not clear what you mean by "deploy". Is that the moment when the WAR file arrives on the app server? Maybe you gin something up with Ant. Is that when the app starts up? Maybe you can do it with a ServletContextListener. There's no mechanism for doing so built into any Java EE

问题 There are already several Q&As on this " X does not implement Y (... method has a pointer receiver) " thing, but to me, they seems to be talking about different things, and not applying to my specific case. So, instead of making the question very specific, I'm making it broad and abstract -- Seems like there are several different cases that can make this error happen, can someone summary it up please? I.e., how to avoid the problem, and if it occurs, what are the possibilities? Thx. 回答1: This

问题 I'm trying to add a string to the user model under a location column, based on the user's location. I have everything setup to the point that I know the value of @city+@state is added to the appropriate column in the correct model. The problem is, it appears that request.location.city and request.location.state function properly in the controller and views, but not in the model. def add_location @city = request.location.city @state = request.location.state @location = @city+@state self

问题 When I run the program this function is in I get a cryptic error that doesn't make sense to me. I wasn't aware I was running a method on a null-valued expression. It occures to me that this is either a scope issue or a value is not getting set. I however have not been able to figure it out and put it out to the community: You cannot call a method on a null-valued expression. At C:\Users\Administrator\Desktop\DCB Settings Modification\DCBxPowershell.ps1:747 char:21 + If ($resetAdapter -eq

问题 Im a beginner in Java and trying to get the sum of all the elements in the ArrayList. Im doing it by using a method and get this error in the method: "bad operand types for binary operatpr '+' first type: int, second type: Object" I don't know what I'm doing wrong here, appreciate any help! public static int sumNumbers(ArrayList numbers){ int sum = 0; for(int i = 0; i<numbers.size(); i++){ sum+=numbers.get(i); } return sum; } 回答1: Declare numbers as ArrayList<Integer> numbers . Then the

问题 I have 4 choices assigned to 4 buttons. One of the choices is correct and it is assigned to the string "correctAnswerString" The 4 buttons call "action:@selector(submitAnswer:)" I want to be able to access the string "correctAnswerString" in the "submit Answer" method and compare if the button with the correct answer has been pressed. I believe this is done by creating an "@interface" in the .h file, but I don't know how to do it. Many appreciations for the help. The code is below: - (void)