codePointCount (int beginIndex, int endIndex)

public synchronized int codePointCount(int beginIndex, int endIndex)

Returns the number of Unicode code points in the specified text range of this sequence.

public class StringBufferCodePointCount {
    public static void main(String args[]){
        int arr[] = {65536, 65537, 65538};
        String s = new String(arr, 0, arr.length);
        
        StringBuffer str = new StringBuffer(s);
        
        System.out.print("Code points count from 0 to " + str.length());
        System.out.println(" is "+ str.codePointCount(0, str.length()));
    }
}

Output

Code points count from 0 to 6 is 3

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