try-catch

Arrays.copyOfRange method in java throws incorrect exception

由 六眼飞鱼酱① 提交于 2019-12-08 14:39:47
问题 I was working on arrays today and suddenly I came across a scenario throwing unexpected exceptions. If you look at the code below , I think it must throw ArrayIndexOutOfBoundsException , but surprisingly it is throwing IllegalArgumentException instead: import java.util.Arrays; public class RangeTest { public static void main(String[] args) { int[] a = new int[] {0,1,2,3,4,5,6,7,8,9}; int[] b = Arrays.copyOfRange(a, Integer.MIN_VALUE, 10); // If we'll use Integer.MIN_VALUE+100 instead Integer

In the try catch block is it bad to return inside the catch? which is good practice

由 你离开我真会死。 提交于 2019-12-08 14:39:21
问题 In the try catch block is it bad practice to return values from the catch block in C++? try { //Some code... return 1; } catch(...) { return 0; } Which method of using try/catch is good practice? 回答1: No, As long as the returned value means what you wanted it to be, you can return anytime. (make sure you've cleared memory if allocated). 回答2: I prefer to have few exits points in my code, so I would write: int rc = 1; try { // some code } catch(...) { rc = 0; } return rc; I find it easier to

Skip Error and Continue Function in R

由 …衆ロ難τιáo~ 提交于 2019-12-08 13:35:23
问题 I have a data set with p number of variables. I want a function that creates histograms of each variable, and when it encounters a problem it attempts to create a barplot instead. If it encounters a problem after attempting the barplot it skips that p, and continues to the next p. What I'm thinking (pseudocode): for (i in ncol(data)) { try( hist(data[i])) { if "error" try( barplot(data[i])) { if "error" print ("Error") } } continue to i # code executes through all columns of data } } I've

not avoiding/skipping errors with try and tryCatch

由 我的未来我决定 提交于 2019-12-08 13:14:30
I have a nlsLM inside a for loop because I want to try different start values to fit my data. I already know that some start values generates this error : singular gradient matrix at initial parameter estimates , but I want to skip this error and continue with the loop , fitting the regression with the next start values . I tried to put all the for loop inside a try and a tryCatch block, setting silence=TRUE , but the code still stopping when the singular gradient matrix at initial parameter estimates error occurs. Someone can help me with that? Here is the code: try({ for (scp.loop in scp

Unhandled exception in try-catch

由 回眸只為那壹抹淺笑 提交于 2019-12-08 11:59:03
问题 try { list = from XElement e in d.Descendants(wix + "File") where e.Attribute("Name").Value.Contains(temp.Name) && e.Parent.Parent.Attribute("Name").Value.Contains(temp.Directory.Name) select e; } catch (NullReferenceException e) { MessageBox.Show(e.Message); } catch (Exception e) { MessageBox.Show(e.Message); } now my question is why does this code produce a run time error saying I have a NullReferenceException unhandled. If you need more information about the program let me know. EDIT: The

try and catch error in android

由 本秂侑毒 提交于 2019-12-08 08:48:52
问题 I am developing an android app that implements Maps inside a fragment. However I have a problem with the try and catch block. I keep getting the error Exception 'com.google.android.gms.common.GooglePlayServicesNotAvailableException ' is never thrown in the corresponding try block. How can I solve this error? Thanks In Advance. Here is the code: import android.support.v4.app.Fragment; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.LayoutInflater;

Try catch is not catching a bad number input ( Also getting a java.lang.arithmatic exception / zero)

由 最后都变了- 提交于 2019-12-08 06:24:31
问题 This is a Constructor that I have for a test average class. My assignment asks me to bring in an array-list of test score and as input validation, it wants me to use a try catch statement to catch any input under 0 and over 100. The constructor below is bringing in an array-list from my main with out any error. However, it is not catching a negative input. I been looking at this code for over two hours and I can't figure it out. I thought a fresh pair of eyes could probably see why it is not

Get around java's try/catch and keep the code clean without returning a null

由 China☆狼群 提交于 2019-12-08 05:30:31
I have this piece of code: private void myFunc(){ obj = doSomething(); //If value is found, doX() //If value is not found, doY() } private obj doSomething(){ //Do some stuff //Hit database to get some value obj = db.getValue(); //This func throws an exception if no value is found } Now, my question is: 1. Should I do: doSomething() throws ValueNotFoundException and catch it in myFunc() 2. Or catch it in doSomething() and return null? (a very bad approach though). And then check for null in myFunc() Update: 1. Value not found is something which is probable and not an error. Well, is value not

not avoiding/skipping errors with try and tryCatch

由 二次信任 提交于 2019-12-08 04:36:12
问题 I have a nlsLM inside a for loop because I want to try different start values to fit my data. I already know that some start values generates this error : singular gradient matrix at initial parameter estimates , but I want to skip this error and continue with the loop , fitting the regression with the next start values . I tried to put all the for loop inside a try and a tryCatch block, setting silence=TRUE , but the code still stopping when the singular gradient matrix at initial parameter

Catch QML error message

由 孤街醉人 提交于 2019-12-08 03:23:49
问题 I'm using Qt.createQmlObject() to create a QML object from a file. In the case the file is corrupted, QML outputs a message that looks like this: Qt.createQmlObject(): failed to create object: qrc:/graphics/inline:5:2: Expected token }'` I'd like to catch the message in order to tell the user that his file is corrupted. I am trying to use the third argument provided in the Qt.createQmlObject() but I don't understand how it works. The wiki describes the function quite well but doesn't give any
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