indexoutofboundsexception

问题 How do I get up to the first n characters of a string in Java without doing a size check first (inline is acceptable) or risking an IndexOutOfBoundsException ? 回答1: 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

问题 When I use this code without <p:tab> it works as expected, <h:form> <p:wizard> <p:tab title="Test-1"> <h:form> <p:growl id="msg"/> <p:selectOneMenu value="#{studentController.departmentIDgenerate}"> <f:selectItems value="#{departmentController.departmentList}" var="deparet" itemLabel="#{deparet.departmentName}" itemValue="#{deparet.departmentId}"/> <p:ajax listener="#{studentController.addMessage}" update="msg"/> </p:selectOneMenu> </h:form> </p:tab> <p:tab title="Test-2"> </p:tab> </p:wizard

问题 I have no idea what is happening. I have a list of products along with a number separated with a tab. When I use indexOf() to find the tab, I get a String index out of bounds error , and it says the index is -1. Here's the code: package taxes; import java.util.*; import java.io.*; public class Taxes { public static void main(String[] args) throws IOException { //File aFile = new File("H:\\java\\PrimeNumbers\\build\\classes\\primenumbers\\priceList.txt"); File aFile = new File("C:\\Users\\Tim\

问题 i have an outofbound exception index 1, size 1 i cant seem to find the problem here is my code: public void removeSpellToGraveyard(ArrayList<SpellCard> spells){ for(int c=0; c<5 ; c++ ){ SpellCard r = spells.get(c); for(int i=0; i<5;i++){ if(spellArea.get(i) == r){ graveyard.add(spellArea.remove(i)); } } } } 回答1: I'm going to provide a version of your method which achieves its apparent intent. My hope is that this will at least help you figure out what you wanted to do, if it doesn't solve

问题 I am parsing a CSV file into my program, spliting the values at the , element, and it's working fine, except for when I have lines that have missing values. The parser is working like this: import java.io.BufferedReader; import java.io.FileReader; import java.io.IOException; public class CsvReader { private static final String DELIMITER = ","; private final BufferedReader br; private final String path; public CsvReader(final String path) throws IOException { this.path = path; this.br = new

问题 I have an app which loads a listview when opened, however I am getting an Array Index Out Of Bounds Exception, with no clues as to where the problem lies. It is trying to access index=-1 somewhere, but I have no idea where. The app loads Homework information from a database, puts them into separate Homework objects in an ArrayList and loads it into the ListView from there. I really don't know where the exception is coming from, I have checked all my code. There is only 1 homework in the list,

问题 This code uses for loop to find values of yc by putting value of x in the equation.The error is "error: Mat::operator(): index out of bounds terminate called after throwing an instance of 'std::logic_error' what(): Mat::operator(): index out of bounds". #include<iostream> #include<armadillo> #include<vector> using namespace std; using namespace arma; int main() { float a[3]; float c; int gp = 100; cout << "Please Enter NACA 4 digits" << endl; cout << "Please Enter 1st digit" << endl; cin >> a

问题 This my project code I want to save my data into database. def save(){ List<Employee> list = Employee.findAllById(session.getAttribute("empId")) Milestone milestone = new Milestone() milestone.setMilestone_Date(params.milestone_Date) milestone.setMilestone_Name(params.milestone_Name) milestone.setMilestone_Description(params.milestone_Description) milestone.save() EmployeeMilestone employeeMilestone=new EmployeeMilestone() Employee employee = list.get(0) employeeMilestone.setEmployee(employee

问题 The issue is purely with the contents inside the tables. If the table is not empty (with one or more records), application works perfectly. I am deleting the contents of table and immediately after that reading the same table, it throws exception and app force closes. I tried searching for it but couldn't conclude. The key point is : index out of bound exception which is thrown at movetofirst() method of cursor when i am going to read the table, i suppose... Please help. public List<TableData

问题 Why is the IndexOutOfBoundsException thrown in the following code segment? I can’t seem to understand why it is thrown? import java.util.*; public class PrimeNumbers { //Printing all prime numbers less than 600 using 'Sieve Method' final static int SIZE = 600; static ArrayList<Integer> numbers = new ArrayList<Integer>(SIZE); public static void populateList(ArrayList<Integer> arraylist){ for(int i=0; i<SIZE; i++){ arraylist.add(i, i); } } public static void filterMultiples(ArrayList<Integer>