Java: Count a number of Unicode code points in the specified text range of a String

Last update on May 21 2025 12:49:33 (UTC/GMT +8 hours)

4. Count Unicode Points in Range

Write a Java program to count Unicode code points in the specified text range of a string.

Sample Solution:

Java Code:

// Define a public class named Exercise4.
public class Exercise4 {
    // Define the main method.
    public static void main(String[] args) {
  
        // Declare and initialize a string variable "str" with the value "w3rsource.com".
        String str = "w3rsource.com";
        // Print the original string.
        System.out.println("Original String : " + str);
        
        // Count the number of Unicode code points from index 1 to index 10 in the string.
        int ctr = str.codePointCount(1, 10);
        
        // Print the count of Unicode code points from index 1 to index 10 in the string.
        System.out.println("Codepoint count = " + ctr);
    }
}

Sample Output:

Original String : w3rsource.com                                                                               
Codepoint count = 9

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Java program to count and display the number of Unicode code points in a specified substring range.
• Write a Java program that accepts a string and two indices, then computes the total Unicode value sum within that range.
• Write a Java program to count Unicode code points in a string region while skipping digits.
• Write a Java program to verify if the count of Unicode code points in a substring range matches a user-specified number.

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