What is the String.codePointBefore() method in Java?

The codePointBefore()method in Java is used to get the Unicode value of a character in the string before the specified index.

Syntax

The codePointBefore() method can be declared as shown in the code snippet below:

public int codePointBefore(int ind)

Parameter

  • ind: The index following the character whose Unicode value is required. The index value must be between 1 and the length of the string.

Return value

The codePointBefore() method returns an int, which is the Unicode value of the specified character.

The codePointBefore() method throws the IndexOutOfBoundsException if:

  • The index ind is less than one.
  • The index ind is greater than the length of the string.

Code

Consider the code snippet below, which demonstrates the use of the codePointBefore() method.

class Main {
    public static void main(String[] args)
    {
        String str = "Hello world!";
        int code = str.codePointBefore(4);
        System.out.println("Code point at 3rd index: " + code);
    }
}

Explanation

A string str is declared in line 5. The codePointBefore() method is used in line 6 to get the Unicode value of the character at third index in str.

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