Here’s a neat solution: String upToNCharacters = s.substring(0, Math.min(s.length(), n)); Opinion: while this solution is “neat”, I think it is actually less readable than a solution that uses if / else in the obvious way. If the reader hasn’t seen this trick, he/she has to think harder to understand the code. IMO, the code’s meaning … Read more
Lets start by removing the outer h:form (form that wraps the <p:wizard> ) cause you got a nested forms here (which is bad)
In JavaFX, you cannot change the contents of an ObservableList while a change is already in progress. What is happening here is that your listeners (any of the ones you try) are being fired as part of the box.getSelctionModel().getSelectedItems() ObservableList changing. So basically, you cannot change the selection while a selection change is being processed. … Read more
In addition to what @Saurav posted, newMatrix is empty so you cannot assign values to newMatrix[i][j]. You can fix this by initializing the vectors with a given size: vector< vector<int> > resizeVector(vector< vector<int> > m) { vector< vector<int> > newMatrix(m.size()); int i,j; for (i = 0; i < m.size(); i++) { newMatrix[i].resize(m[i].size()); for(j = 0; … Read more
java.util.ArrayList.throwIndexOutOfBoundsException: Invalid index 3, size is 3 It means you have ArrayList which having 3 elements where you can get each element like 0,1,2 positions. And you are trying to read 4th element which does not exists into ArrayList. java.util.ArrayList.throwIndexOutOfBoundsException: Invalid index 0, size is 0 It means you have a empty ArrayList, and you … Read more
Ultimately it probably doesn’t have a safe .get method because a dict is an associative collection (values are associated with names) where it is inefficient to check if a key is present (and return its value) without throwing an exception, while it is super trivial to avoid exceptions accessing list elements (as the len method … Read more
I had a (possibly) related issue – entering a new instance of an activity with a RecyclerView, but with a smaller adapter was triggering this crash for me. RecyclerView.dispatchLayout() can try to pull items from the scrap before calling mRecycler.clearOldPositions(). The consequence being is that it was pulling items from the common pool that had … Read more
You’re confusing the size of the array list with its capacity: the size is the number of elements in the list; the capacity is how many elements the list can potentially accommodate without reallocating its internal structures. When you call new ArrayList<Integer>(10), you are setting the list’s initial capacity, not its size. In other words, … Read more
This exception is thrown when you try to access an array item that doesn’t exist: String [] myArray = new String[2]; myArray[2] = “something”; // Throws exception myArray[-1] = “something”; // Throws exception You should check that your index is not negative and not higher than the array length before accessing an array item.
C doesn’t check array boundaries. A segmentation fault will only occur if you try to dereference a pointer to memory that your program doesn’t have permission to access. Simply going past the end of an array is unlikely to cause that behaviour. Undefined behaviour is just that – undefined. It may appear to work just … Read more