NullPointerException when Creating an Array of objects [duplicate]

Answer 1

I think by calling

ResultList[] boll = new ResultList[5];

you created an array which can hold 5 ResultList, but you have to initialize boll[0] before you can set a value.

boll[0] = new ResultList();

Answer 2

You created the array but didn't put anything in it, so you have an array that contains 5 elements, all of which are null. You could add

boll[0] = new ResultList();

before the line where you set boll[0].name.

Answer 3

As many have said in the previous answers, ResultList[] boll = new ResultList[5]; simply creates an array of ResultList having size 5 where all elements are null. When you are using boll[0].name, you are trying to do something like null.name and that is the cause of the NullPointerException. Use the following code:

public class Test {
    public static void main(String[] args){
        ResultList[] boll = new ResultList[5];

        for (int i = 0; i < boll.length; i++) {
            boll[i] = new ResultList();
        }

        boll[0].name = "iiii";
   } 
}

Here the for loop basically initializes every element in the array with a ResultList object, and once the for loop is complete, you can use

boll[0].name = "iiii";