如何将ArrayList转换为多维数组？

Question

this line of code is throwing me the exception: Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 5, Size: 5

String [][] employeeNamesA = new String [2][index];
for (int i = 0; i<index; i++)employeeNamesA[0][i] = employeeNames.get(i);

I am trying to convert a ArrayList into a multidimensional Array.

Answer 1

Your employeeNames list doesn't have index amount of elements. It most likely has 5, which means it will throw IndexOutOfBoundsException when executing employeeNames.get(i) for i = 5.

Answer 2

As jlordo has suggested, you should just create an Employee class.

Here's an example:

class Employee {

    String name;
    String info;

    public Employee(String n, String i) {
        name = n;
        info = i;
    }

    public String getName() {
        return name;
    }

    public void setName(String s) {
        name = s;
    }

    public String getInfo() {
        return info;
    }

    public void setInfo(String s) {
        info = s;
    }
}


List<String> nameList = // populate nameList
List<String> infoList = // populate infoList

List<Employee> employeeList = new ArrayList<Employee>();

for (int i = 0; i < nameList.size(); i++) {
    String name = nameList.get(i);
    String info = null;
    if (infoList.size() > i) {
        info = infoList.get(i);
    }
    Employee emp = new Employee(name, info);
    employeeList.add(emp);
}

---

Now you have a list of Employee objects rather than a silly multi-dimensional array.

( Notice we check the size of infoList in the loop to avoid an IndexOutOfBoundsException )