The codePointAt() method of StringBuffer class returns a character Unicode point at that index in sequence contained by StringBuffer. This method returns the “Unicodenumber” of the character at that index. Value of index must be lie between 0 to length-1.
If the char value present at the given index lies in the high-surrogate range, the following index is less than the length of this sequence, and the char value at the following index is in the low-surrogate range, then the supplementary code point corresponding to this surrogate pair is returned. Otherwise, the char value at the given index is returned.
Syntax:
public int codePointAt(int index)
Parameters: This method takes one parameter index which is int value representing index of the character whose unicode value to be returned.
Return Value: This method returns unicode number of the character at the specified index.
Exception: This method throws IndexOutOfBoundsException when index is negative or greater than or equal to length().
Below programs demonstrate the codePointAt() method of StringBuffer Class:
Example 1:
// Java program to demonstrate// the codePointAt() method class GFG { public static void main(String[] args) { // create a StringBuffer object StringBuffer str = new StringBuffer(); // add the String to StringBuffer Object str.append("Geeksforgeeks"); // get unicode of char at position 10 int unicode = str.codePointAt(10); // print the result System.out.println("Unicode of Character " + "at Position 10 " + "in StringBuffer = " + unicode); }} |
Unicode of Character at Position 10 in StringBuffer = 101
Example 2: To demonstrate IndexOutOfBoundsException
// Java program demonstrate// IndexOutOfBoundsException thrown by// the codePointAt() 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"); try { // get char at position 25 which is // greater then length int i = str.codePointAt(25); } catch (IndexOutOfBoundsException e) { System.out.println("Exception: " + e); } }} |
Exception: java.lang.StringIndexOutOfBoundsException: String index out of range: 25
References:
https://docs.oracle.com/javase/10/docs/api/java/lang/StringBuffer.html#codePointAt(int)
