How to define array in java

Array definition method one

Dynamic method (specify the length of the array)

Format:

数组存储的数据类型[]数组名字 = new 数组存储的数据类型[长度];

[]: represents an array.

Array name: Give a variable name to the defined array, which meets the identifier specification. You can use the name to operate the array.

new: keyword, keyword used to create an array.

Data type stored in the array: See what data type the created array is used to store.

[Length]: The length of the array, indicating how many elements can be stored in the array container.

Example:

Define an array container that can store 3 integers. The code is as follows:

int[] arr = new int[3];

Array definition method two

Static mode (specify the elements of the array)

Format:

数据类型[] 数组名 = new 数据类型[]{元素1,元素2,元素3...};

Define an array container that stores 1, 2, 3, 4, 5 integers.

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

Or omit the format: (You cannot declare first and then assign a value, you can only declare and assign a value at the same time)

Data type [] Array name = {Element 1, Element 2, Element 3... };

Define an array container that stores integers 1, 2, 3, 4, and 5.

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

Note:

1. If you use static method to create an array, the system will automatically calculate the length of the array based on the number of elements

2. The length cannot be written in the square brackets on the right side of the array created in the static way

3. The array created in the omitted format in the static way cannot be declared first and then assigned. It can only be declared and assigned directly at the same time

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