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Showing content from https://www.geeksforgeeks.org/java/stringbuffer-codepointbefore-method-in-java-with-examples/ below:

StringBuffer codePointBefore() method in Java with Examples

Last Updated : 04 Dec, 2018

The

method of

is a method used to take an index as a parameter and returns the “Unicode number” of the character present before that index. The value of index must lie between 0 to length-1. If the char value at (index – 1) is in the low-surrogate range, char at (index – 2) is not negative with value is in the high-surrogate range, then the supplementary code point value of the surrogate pair is returned by method. If the char value at index – 1 is an unpaired low-surrogate or a high-surrogate, the surrogate value is returned.

public int codePointBefore(int index)

This method take one parameter

which is the index of the character following the character whose unicode value to be returned.

This method returns

of the character before the given index.

This method throws

when index is negative or greater than or equal to length(). Below programs illustrate the codePointBefore() method:

// Java program to demonstrate
// the codePointBefore() Method.

class GFG {
    public static void main(String[] args)
    {

        // create a StringBuffer object
        // with a String pass as parameter
        StringBuffer
            str
            = new StringBuffer("GeeksForGeeks Contribute");

        // get unicode of char at index 13
        // using codePointBefore() method
        int unicode = str.codePointBefore(14);

        // print char and Unicode
        System.out.println("Unicode of character"
                           + " at position 13 = "
                           + unicode);
    }
}

Unicode of character at position 13 = 32

To demonstrate IndexOutOfBoundsException

// Java program to demonstrate
// exception thrown by codePointBefore() Method.

class GFG {
    public static void main(String[] args)
    {

        // create a StringBuffer object
        // with a String pass as parameter
        StringBuffer
            str
            = new StringBuffer("GEEKSFORGEEKS");

        try {

            // get unicode of char at position 22
            int unicode = str.codePointBefore(22);
        }

        catch (Exception e) {

            System.out.println("Exception: " + e);
        }
    }
}

Exception: java.lang.StringIndexOutOfBoundsException:
 String index out of range: 22

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