Скачать или смотреть difference between array and arraylist in java

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sure! in java, both arrays and arraylists are used to store collections of data. however, they have some fundamental differences in terms of their structure, functionality, and usage. below is a detailed tutorial on the differences between arrays and arraylists, along with code examples.

arrays

1. **fixed size**: once an array is created, its size is fixed and cannot be changed.
2. **data type**: all elements in an array must be of the same data type (e.g., all integers, all strings, etc.).
3. **syntax**: arrays are defined using square brackets `[]`.
4. **performance**: arrays provide better performance for storing and accessing data compared to arraylists, as they are a lower-level data structure.
5. **multidimensional support**: arrays can be multidimensional (e.g., two-dimensional arrays).

*example of array:*


arraylists

1. **resizable**: arraylists can grow and shrink dynamically as elements are added or removed.
2. **generic type**: arraylists can store objects of any type, and you can specify the type of objects they will hold using generics (e.g., `arrayliststring`).
3. **syntax**: arraylists are part of the java collections framework and require importing `java.util.arraylist`.
4. **performance**: arraylists incur a slight overhead due to dynamic resizing and the need for boxing/unboxing when dealing with primitive types.
5. **flexibility**: arraylists provide more methods for manipulating data, such as adding, removing, and searching for elements.

*example of arraylist:*


key differences

| feature | array | arraylist |
|----------------------|---------------------------|--------------------------|
| size | fixed | dynamic |
| data type | homogeneous | can be homogeneous or heterogeneous (using generics) |
| syntax | `int[] arr = new int[5];`| `arraylisttype list = new arraylist();` |
| import re ...

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