arrayListMysteryInsert

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Main Page → Exercises → Java → Solve an Exercise

Language/Type: Java ArrayList collections

What are the contents of the list after the following code executes?

ArrayList<Integer> list = new ArrayList<Integer>();
for (int i = 1; i <= 5; i++) {
    list.add(2 * i);         // [2, 4, 6, 8, 10]
}
int size = list.size();
for (int i = 0; i < size; i++) {
    list.add(i, 42);    // add 42 at index i
}
System.out.println(list);

list contents
[2, 4, 6, 8, 10, 42, 42, 42, 42, 42] [42, 42, 42, 42, 42, 2, 4, 6, 8, 10] [42, 2, 42, 4, 42, 6, 42, 8, 42, 10] [2, 42, 4, 42, 6, 42, 8, 42, 10, 42] other

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arrayListMysteryInsert