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What does char in java mean?

May 01, 2024 pm 06:15 PM
implicit conversion

Java 中的 char 类型用于存储单个 Unicode 字符,占 2 个字节,范围从 U+0000 到 U+FFFF,主要用于存储文本字符,可以通过单引号或 Unicode 转义序列初始化,可参与比较、相等性、不相等性和连接运算,可隐式转换为 int 类型,也可以显式转换为 Character 对象。

What does char in java mean?

Java 中的 char 类型

Java 中的 char 类型是一种原始数据类型,用于存储单个 Unicode 字符。它占 2 个字节,可以表示从 U+0000 到 U+FFFF 的 Unicode 字符范围。

用途

char 类型主要用于存储文本字符,例如字母、数字和符号。它常用于表示用户名、密码、文件路径和字符串中的单个字符。

范围

char 类型的最小值为 '\u0000'(NUL 字符),最大值为 '\uffff'。这意味着它可以表示 65,536 个不同的 Unicode 字符。

初始化

char 类型可以通过使用单引号将字符文字直接分配给它来初始化,例如:

char c1 = 'A';
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也可以使用 Unicode 转义序列来初始化 char 类型,例如:

char c2 = '\u03B2'; // 希腊字母 β
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运算

char 类型可以与其他 char 类型进行比较、相等性和不相等性运算。它还可以与字符串类型进行连接运算。

类型转换

char 类型可以隐式转换为 int 类型,因为它实际上是 16 位 Unicode 代码点。也可以使用 Character 类中的 (un)box 方法在 charCharacter 对象之间进行显式转换。

示例

以下示例展示了如何使用 char 类型:

public class CharExample {

    public static void main(String[] args) {
        char c1 = 'H'; // 字符 H
        char c2 = '\u0045'; // 字符 E
        
        System.out.println("c1: " + c1);
        System.out.println("c2: " + c2);
        System.out.println("c1 + c2: " + (c1 + c2)); // 字符连接
    }
}
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