Java Character.isSurrogate() Method

In Java, the Character.isSurrogate() function determines if a specified character is a surrogate character. Surrogate pairs in UTF-16 encoding represent characters that are beyond the Basic Multilingual Plane (BMP). These pairs consist of high surrogates and low surrogates.

A character is deemed a surrogate code unit if it meets the criteria to be categorized as either a low surrogate or a high surrogate. High surrogates range from U+D800 to U+DBFF, while low surrogates are found between U+DC00 and U+DFFF.

Syntax:

Parameter: ch - the character to check.

Returns: true if the character is a surrogate; false otherwise.

Let's see how Character.isSurrogate() method works.

Java Character.isSurrogate() Method Example

Program 1:

This Java program assesses if particular characters are surrogate code units by using the Character.isSurrogate() method. It handles different kinds of characters, including Unicode characters, letters, digits, and symbols, and delivers the appropriate outcomes.

Output:

 
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   

Program 2:

This Java application prompts the user to input a character and checks if it is a surrogate code unit by utilizing the Character.isSurrogate() method.

Output:

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

Program 3:

This Java application verifies whether a specified character is a surrogate code unit by employing the Character.isSurrogate() function and saves the outcome in a boolean variable. It subsequently employs a conditional expression to assess if the character is a surrogate code unit.

Output:

 
The character '?' is a surrogate code unit.