Question about arrays in Java, and understanding the difference between C++ and Java?

Question

Java

Integer[] arr = new Integer[5];

Integer arr1[];

Is there any difference between these arrays? I used to study C++ and I'm not used to the syntax of the first array, because this is how C++ allocated memory for a dynamic array. Does Java allocate dynamic memory for all arrays? C++ is a static language and Java is OOP, but I don't fully understand the difference between the two. OOP has classes, although C++ also has classes. In short, I am very confused. Help.

Answer 1

Integer[] arr = new Integer[5];   // так вы объявляете массив длинной 5 элементов.
Integer[] arr1; // переменная arr1 объявлена, но не инициализирована.

You can write like this:

Integer[] arr;
arr = new Integer[5];

If you want dynamic arrays, look into collections. Java has collections for all occasions.