What does array mean in java

Array in Java is a continuous storage structure that stores the same type of data. Elements can be accessed by index (starting from 0): declaration: using data type [] array name = new data type [size]; access: via array name [index]; length: obtained via array name.length; initialization: at declaration Use braces {1, 2, 3, 4, 5}; the difference from List: Array has a fixed size, can only store elements of the same type, and has higher access efficiency.

Array in Java

Array (array) in Java is a data structure that stores continuously data elements of the same type. Elements of an array are accessed by index, starting from 0.

Declaration of arrays

In Java, use the following syntax to declare an array:

数据类型[] 数组名 = new 数据类型[大小];

For example:

int[] numbers = new int[5]; // 声明一个包含 5 个整数的数组

Access to array elements

You can access array elements by index:

数组名[索引]

For example:

System.out.println(numbers[0]); // 输出数组 numbers 中第一个元素

The length of the array

The length of the array can be obtained through the length attribute:

数组名.length

For example:

System.out.println("数组 numbers 的长度：" + numbers.length); // 输出数组 numbers 的长度

Initialization of the array

The array can be initialized when it is declared, using large Brackets {} enclose elements:

int[] numbers = {1, 2, 3, 4, 5};

The difference between array and List

Array and List are both data structures used to store elements in Java, but there is a difference between them There are some key differences:

• Capacity: The size of an Array is fixed after creation, while the size of a List can be dynamically adjusted.
• Type: Array can only store data elements of the same type, while List can store data elements of different types.
• Efficiency: Array is generally more efficient than List when accessing and modifying elements.

Conclusion

Array is a simple and efficient data structure in Java used to store data elements of the same type. They are ideal for situations where fixed-size data structures are required.

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