Given this arraylist definition, Can this arraylist hold more than 5 elements? ArrayList arr = new ArrayList(5);

Question

Given this arraylist definition, Can this arraylist hold more than 5 elements? ArrayList arr = new ArrayList<>(5);

BlackTom AI · Accepted Answer

ArrayList's constructor argument specifies the initial capacity (the size of the internal array), not a hard limit on how many elements the list can hold. 1) Relevant concepts - size vs capacity: size is the number of elements currently stored; capacity is the length of the internal array used to store elements. - ArrayList is resizable: when size would exceed capacity, ArrayList grows its internal array automatically (reallocating to a larger array and copying elements). - Growth policy (OpenJDK): newCapacity = oldCapacity + (oldCapacity >> 1) (i.e., 1.5×), though exact policy can vary by implementation. 2) Step-by-step reasoning - The statement ArrayList arr = new ArrayList<>(5); sets the internal array capacity to 5 and the list size to 0. - Adding elements with arr.add(...) increments size; you can add up to 5 elements without resizing. - When you add a 6th element, the implementation detects size + 1 > capacity and grows the internal array before storing the new element. 3) Calculation / intermediate steps (example of adding a 6th element) - initial capacity = 5 - after adding 5 elements: size = 5, capacity = 5 - on adding 6th element: oldCapacity = 5 - newCapacity = oldCapacity + (oldCapacity >> 1) = 5 + (5 >> 1) = 5 + 2 = 7 - internal array grows to capacity 7, the 6th element is stored, size becomes 6 4) Why the correct answer is correct Because the constructor parameter only sets initial capacity, ArrayList automatically resizes when needed, so it can hold more than 5 elements. 5) Why the other option (False) is incorrect Saying False would claim the list cannot grow beyond 5; that confuses capacity with a fixed limit. ArrayList is not fixed-size — it dynamically expands. Conclusion: The correct answer is True.

Given this arraylist definition, Can this arraylist hold more than 5 elements? ArrayList<String> arr = new ArrayList<>(5); True/False

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