Is it permissible to modify the size of the allocated memory area in dynamic placement (heap)?

In Java, it is not possible to directly change the size of a memory area allocated on the heap, as memory management is handled automatically through garbage collection. The memory allocated for objects is fixed at the time of their creation, and the size of an already allocated object cannot be changed.

If you need to "resize" data, you typically create a new object with the desired size and copy the data into it. For example, for arrays, a new array of the required size is created, and the elements are copied into it.

Example of array expansion:

int[] oldArray = {1, 2, 3};
int[] newArray = new int[5];
System.arraycopy(oldArray, 0, newArray, 0, oldArray.length);
// Now newArray has length 5, with the first 3 elements copied

Thus, dynamic resizing of memory in the heap is not provided for; memory management is abstracted and automated.