Arrays in Java have to have a specific size. If you want a dynamically-sized data structure, use an ArrayList. You can use a list, probably an ArrayList. There is a NullPointerException because …

Aug 16, 2012 · Using Java.util.ArrayList or LinkedList is the usual way of doing this. With arrays that's not possible as I know. Example: You might be looking for a List? Either LinkedList or …

In Java, you typically need to declare the size of an array when initializing it. However, you can create an array without explicitly providing its size in different ways. This guide will explore …

Mar 27, 2012 · The third line of your snippet says "make an array of ints with r+1 slots, and put the new array into the already-existing array at slot r." You can make any of the 11 arrays as big …

Declare an array variable without initializing it to any size, and then allocate memory later when you know the size. Consider using an ArrayList, which is a part of the Java Collections …

Dec 16, 2024 · We can easily declare an array by specifying its data type followed by square brackets and the array name: int[] numbers; In the code above, we declare an uninitialized …

Mar 31, 2025 · Yes, you can declare an array without specifying its size using the array initializer syntax in Java. For example: String[] names = {"John", "Jane", "Tom"}; In the above examples, …

Dec 15, 2018 · How you will Declare an array in java without size? You can do it with an ArrayList, It’s a collection framework used in Java that serves as dynamic data. Here is an example code …

Jun 28, 2020 · Instead of using an array, you can use a list without having to declare the size. You can then add items on the fly. Your arr would be replaced by. ArrayList<Integer> myList = new …

Mar 5, 2019 · You can create an array without specifying the array size, if you know the elements you are going to populate it with. The array variable declaration, the array creation and the …