Java Character.isSurrogate() Method

2025 年 5 月 8 日 | 阅读 3 分钟

在 Java 中，Character.isSurrogate() 函数用于确定一个给定的字符是否是代理字符。UTF-16 编码中的代理对用于表示超出基本多文种平面 (BMP) 范围的字符。这些对由高代理和低代理组成。

如果一个字符满足被归类为低代理或高代理的标准，它就被视为代理码单元。高代理的范围是从 U+D800 到 U+DBFF，而低代理则位于 U+DC00 和 U+DFFF 之间。

语法

参数： ch - 要检查的字符。

返回值： 如果字符是代理，则返回 true；否则返回 false。

让我们看看 Character.isSurrogate() 方法是如何工作的。

Java Character.isSurrogate() 方法示例

程序 1

这个 Java 程序通过使用 Character.isSurrogate() 方法来评估特定字符是否是代理码单元。它处理不同种类的字符，包括 Unicode 字符、字母、数字和符号，并给出适当的结果。

public class SurrogateChecker {
    public static void main(String[] args) { 
        char char1 = '\udd10'; 
        char char2 = 'c';      // Define a regular alphabet character
        char char3 = '8';      // Define a numeric character
        char char4 = '\uf000'; // Define a Unicode character not in surrogate range
        char char5 = '%';      // Define a special symbol character
        // Check if char1 is a surrogate character
        boolean result1 = Character.isSurrogate(char1);
        // Check if char2 is a surrogate character
        boolean result2 = Character.isSurrogate(char2);
        // Check if char3 is a surrogate character
        boolean result3 = Character.isSurrogate(char3);
        // Check if char4 is a surrogate character
        boolean result4 = Character.isSurrogate(char4);
        // Check if char5 is a surrogate character
        boolean result5 = Character.isSurrogate(char5);
        // Print the result for char1
        System.out.println("Does " + char1 + " qualify as a surrogate? " + result1);
        // Print the result for char2
        System.out.println("Check if " + char2 + " is a surrogate: " + result2);
        // Print the result for char3
        System.out.println("Is " + char3 + " considered a surrogate? " + result3);
        // Print the result for char4
        System.out.println("Verification: Is " + char4 + " a surrogate character? " + result4);
        // Print the result for char5
        System.out.println("Can " + char5 + " be classified as a surrogate? " + result5);
    }
}   

输出

 
Does ? qualify as a surrogate? true
Check if c is a surrogate: false
Is 8 considered a surrogate? false
Verification: Is ? a surrogate character? false
Can % be classified as a surrogate? false

程序 2

这个 Java 应用程序提示用户输入一个字符，并通过使用 Character.isSurrogate() 方法来检查它是否是代理码单元。

import java.util.Scanner;
public class SurrogateCharacterCheck {
    public static void main(String[] args) {
        try {
            System.out.print("Enter a character to verify if it is a surrogate: ");
            Scanner scanner = new Scanner(System.in);
            // Read the first character from user input
            char inputChar = scanner.next().charAt(0);
            // Check if the character is a surrogate
            boolean isSurrogate = Character.isSurrogate(inputChar);
            // Display the result in a professional manner
            System.out.println("Character '" + inputChar + "' is a surrogate code unit: " + isSurrogate);
        } catch (Exception ex) {
            // Handle invalid input with a clear error message
            System.out.println("Error: Invalid input. Please enter a valid character.");
        }
    }
}   

输出

 
Enter a character to verify if it is a surrogate: A
Character 'A' is a surrogate code unit: false

程序 3

这个 Java 应用程序通过使用 Character.isSurrogate() 函数来验证指定的字符是否是代理码单元，并将结果保存在一个布尔变量中。然后，它使用一个条件表达式来评估字符是否是代理码单元。

public class SurrogateCharacterCheck { // Declare the main class
    public static void main(String[] args) {
        // Predefined character for checking
        char inputChar = '\uD800';
        boolean isSurrogate = Character.isSurrogate(inputChar);
        // Use a conditional statement to display the result
        if (isSurrogate) {
            System.out.println("The character '" + inputChar + "' is a surrogate code unit."); // Display message if it's a surrogate
        } else {
            System.out.println("The character '" + inputChar + "' is not a surrogate code unit.");
        }
    }
}   

输出

 
The character '?' is a surrogate code unit.

下一个主题Java Logo

← 上一个下一个 →

Java Character.isSurrogate() Method

Java Character.isSurrogate() 方法示例

程序 1

程序 2

程序 3

联系信息

关注我们

教程

面试题

在线编译器

Python

Java

.Net Framework

AI, ML and Data Science

Cloud Technology

B.Tech and MCA

Web Technology

PHP

Software Testing

Technical Interview

Java Interview

Python

Web Interview

Database Interview

B.Tech / MCA

Important Interview

Software Testing Interview

Company Interviews

Online Compilers

Multiple Choice Questions

Java Conversion

Java Misc

Java Character.isSurrogate() Method

Java Character.isSurrogate() 方法示例

程序 1

程序 2

程序 3

相关帖子

如何在 Java 中从 URL 下载文件

Java 中克隆 HashMap

Java 中的通用链表

Grepcode java.util.Date

Java 中比较时间

Java 中的方法和代码块同步

SortedSet addAll() method in Java with Examples

Java 中的 Optional 类 orElseThrow() 方法

Java 中的 Pangram 程序

Java 和 Core Java 的区别

订阅 Tpoint Tech

联系信息

关注我们

教程

面试题

在线编译器