codePointBefore (int index)

public synchronized int codePointBefore(int index)

Returns the character (Unicode code point) before the specified index. The index refers to char values (Unicode code units) and ranges from 1 to length()

public class StringBufferCodePointBefore {
    public static void main(String args[]){
        int arr[] = {65536, 65537, 65538};
        String s = new String(arr, 0, arr.length);
        
        StringBuffer str = new StringBuffer(s);
        
        for(int i=1; i<str.length()+1; i++){
            System.out.print("Code point before index " + i +" is ");
            System.out.println(str.codePointBefore(i));
        }
    }
}

Output

Code point before index 1 is 55296
Code point before index 2 is 65536
Code point before index 3 is 55296
Code point before index 4 is 65537
Code point before index 5 is 55296
Code point before index 6 is 65538

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