Use java's Character.isSurrogate() function to determine whether a character is a surrogate pair

Use Java's Character.isSurrogate() function to determine whether a character is a surrogate pair

When processing characters, sometimes we encounter special situations such as surrogate pairs. A surrogate pair refers to the situation where two characters are used to represent one character in Unicode encoding. In Java, we can use the isSurrogate() function of the Character class to determine whether a character is a surrogate pair.

The emergence of surrogate pairs is to solve the limitations of Unicode encoding space. Unicode encoding has a total of 1,114,112 code points, of which only 65536 code points are allocated to the Basic Multilingual Plane (BMP), while the other code points are allocated to the additional 17 planes. Due to this limitation, some very rare characters cannot be represented by a single UTF-16 character and therefore require the use of surrogate pairs.

The surrogate pair consists of a high-order character and a low-order character. Specifically, the high-order character ranges from U D800 to U DBFF (a total of 1024 code points), and the low-order character ranges from U DC00 to U DFFF (1024 code points in total). The combination of two characters can represent all characters from U 10000 to U 10FFFF.

The following is an example of using Java code to determine whether a character is a surrogate pair:

public class SurrogatePairExample {
    public static void main(String[] args) {
        char[] chars = { 'A', 'B', 'uD800', 'uDC00', 'uD800', 'uDFFF', 'uDFFF', 'C' };

        for (char c : chars) {
            if (Character.isSurrogate(c)) {
                System.out.println("字符 " + c + " 是代理对");
            } else {
                System.out.println("字符 " + c + " 不是代理对");
            }
        }
    }
}

The above code defines a character array, which contains some normal characters and some surrogate pair characters ('A ', 'B', 'uD800', 'uDC00', 'uD800', 'uDFFF', 'uDFFF', 'C'). Then determine if the character is a surrogate pair by looping through each character in the array and using the Character.isSurrogate() function. If it is a proxy pair, the corresponding information is output.

After running the above code, the output result is:

字符 A 不是代理对
字符 B 不是代理对
字符  是代理对
字符  是代理对
字符  是代理对
字符  是代理对
字符  是代理对
字符 C 不是代理对

We can see that the surrogate pair characters will be correctly judged as surrogate pairs, while other normal characters will be judged as non- Agent pair.

By using the Character.isSurrogate() function, we can easily determine whether a character is a surrogate pair. This is useful for handling scenarios where Unicode encoding is a concern. When processing characters, we should pay attention to the special cases in Unicode encoding to avoid erroneous results due to the existence of surrogate pairs.

Summary:

• In Unicode encoding, a surrogate pair refers to the situation where two characters are used to represent one character.
• Use the Character.isSurrogate() function to determine whether a character is a surrogate pair.
• A surrogate pair consists of a high-order character and a low-order character.
• When processing characters, you should pay attention to the possible surrogate pairs in Unicode encoding.

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