Java string codePointAt() Method

Posted in Java Tutorial

Updated on Jan 15, 2024

By Mari Selvan

👁️ 42 - Views

⏳ 4 mins

💬 1 Comment

Photo Credit to CodeToFun

🙋 Introduction

In Java programming, working with strings is a fundamental task, and Java provides various methods to manipulate and analyze strings.

The codePointAt() method is one such method in the java.lang.String class. It retrieves the Unicode code point value at the specified index in a string.

In this tutorial, we'll explore the usage and functionality of the codePointAt() method.

💡 Syntax

The method signature for codePointAt() is as follows:

Syntax

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public int codePointAt(int index);

index: The index of the character for which you want to retrieve the Unicode code point.

📄 Example

Let's delve into an example to illustrate how the codePointAt() method works.

CodePointAtExample.java

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public class CodePointAtExample {
  public static void main(String[] args) {
    String sampleString = "Hello, Java!";

    // Retrieve the Unicode code point at index 7
    int codePoint = sampleString.codePointAt(7);

    // Output the result
    System.out.println("The Unicode code point at index 7: " + codePoint);
  }
}

💻 Output

Output

The Unicode code point at index 7: 74

🧠 How the Program Works

In this example, the codePointAt() method retrieves the Unicode code point at index 7 in the string "Hello, Java!".

↩️ Return Value

The codePointAt() method returns the Unicode code point value of the character at the specified index.

📚 Common Use Cases

The codePointAt() method is useful when dealing with Unicode characters, especially in scenarios where you need to perform operations or checks based on the specific characters present in a string.

📝 Notes

The index parameter refers to the index of the character, not the byte index.
If the specified index is out of bounds (less than 0 or greater than or equal to the length of the string), an IndexOutOfBoundsException is thrown.
Unicode code points represent unique characters in the Unicode standard.

🎢 Optimization

The codePointAt() method is optimized for retrieving the Unicode code point value at a specified index. However, when dealing with multiple operations on strings, consider optimizing the overall algorithm for better performance.

🎉 Conclusion

The codePointAt() method in Java is a valuable tool when working with Unicode characters. It enhances the capabilities of string manipulation by providing access to the specific Unicode code point at a given index.

Feel free to experiment with different strings and indices to deepen your understanding of the codePointAt() method. Happy coding!