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小高分享（47）Java中的基本数据类型与数组

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Xiao Gao shares (47) Basic data types and arrays in Java

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一、基本数据类型

Frist, basic data types

Java定义了8种基本数据类型，分别是：

Java defines eight basic data types, which are:

整型：byte、short、int、long；浮点型：float、double；字符型：char；布尔型：boolean

Integer: byte, short, int, long; Floating-point type: float, double; Character type: char; boolean: boolean

1. 整型

1. Integer type

整型用于表示没有小数部分的数值。在Java中，整型有不同的范围，如下：

Integers are used to represent values without a fractional part. In Java, integers have different ranges, as follows:

byte：8位，取值范围-128至127；short：16位，取值范围-32768至32767；int：32位，取值范围约为-21亿至21亿；long：64位，取值范围约为-9万亿亿至9万亿亿。

byte: indicates 8 bits, ranging from -128 to 127. short: 16 bits. The value ranges from -32768 to 32767. int: 32-bit. The value ranges from -2.1 billion to 2.1 billion. long: 64-bit. The value ranges from -9 trillion to 9 trillion trillion.

2. 浮点型

2. Floating point type

浮点型用于表示有小数部分的数值。在Java中，浮点型数据类型有两个：

Floating-point type is used to represent numeric values that have a fractional part. In Java, there are two floating-point data types:

float：32位，单精度浮点数；double：64位，双精度浮点数。

float: 32-bit, single-precision floating point number; double: 64-bit, double-precision floating point number.

3. 字符型

3. Character type

字符型用于表示单个字符，使用单引号表示，如'a'、'中'。在Java中，字符型数据类型为char，占用16位。

The character type is used to represent a single character, which is represented by single quotation marks, such as 'a', 'middle'. In Java, the character data type is char, which takes up 16 bits.

4. 布尔型

4. Boolean type

布尔型用于表示真（true）或假（false）的值，在Java中，布尔型数据类型为boolean。

boolean types are used to represent values that are true or false. In Java, Boolean data types are Boolean.

二、数组

Second, array

数组是一种用于存储多个相同类型数据的容器。在Java中，数组具有以下特点：

An array is a container used to store multiple pieces of the same type of data. In Java, arrays have the following characteristics:

1. 声明与初始化

1. Declaration and initialization

声明数组时，需要指定数组类型和数组名，如：int[] arr;。初始化数组时，可以使用静态初始化或动态初始化。

When declaring an array, you need to specify the array type and array name, such as int[] arr; . When initializing an array, either static initialization or dynamic initialization can be used.

静态初始化：int[] arr = {1, 2, 3};

Static initialization: int[] arr = {1, 2, 3};

动态初始化：int[] arr = new int[3]; // 创建一个长度为3的整型数组

Dynamic initialization: int[] arr = new int[3]; // Creates an integer array of length 3

2. 访问数组元素

2. Access array elements

数组元素通过索引访问，索引从0开始。例如，arr[0]表示数组的第一个元素。

Array elements are accessed by index, which starts at 0. For example, arr[0] represents the first element of an array.

3. 数组长度

3. Array length

数组长度表示数组中元素的个数，通过length属性获取。如：arr.length。

The array length represents the number of elements in the array and is obtained by the length attribute. For example, arr.length.

4. 多维数组

4. Multi-dimensional arrays

Java支持多维数组，如二维数组、三维数组等。声明和初始化多维数组时，需要注意每个维度的长度。

Java supports multi-dimensional arrays, such as two-dimensional arrays, three-dimensional arrays, etc. When you declare and initialize multidimensional arrays, you need to pay attention to the length of each dimension.

二维数组示例：int[][] arr = new int[3][4]; // 创建一个3行4列的二维整型数组

Example 2D array: int[][] arr = new int[3][4]; // Create a 2-D integer array with 3 rows and 4 columns

三、基本数据类型与数组的关系

Third, the relationship between basic data types and arrays

基本数据类型可以组成数组，如：int[] arr = {1, 2, 3};。数组中的元素必须是同一类型，但可以是基本数据类型或引用数据类型。

Basic data types can be formed into arrays, such as int[] arr = {1, 2, 3}; . The elements in the array must be of the same type, but can be primitive data types or reference data types.

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