StringBuffer setCharAt() method in Java with Examples Last Updated : 04 Dec, 2018 Comments Improve Suggest changes Like Article Like Report The setCharAt() method of StringBuffer class sets the character at the position index to character which is the value passed as parameter to method. This method returns a new sequence which is identical to old sequence only difference is a new character ch is present at position index in new sequence. The index argument must be greater than or equal to 0, and less than the length of the String contained by StringBuffer object. Syntax: public void setCharAt(int index, char ch) Parameters: This method takes two parameters: index: Integer type value which refers to the index of character to be set. ch: Character type value which refers to the new char. Returns: This method returns nothing. Exception: This method throws IndexOutOfBoundException if the index is negative or greater than length(). Below programs demonstrate the setCharAt() method of StringBuffer Class Example 1: Java // Java program to demonstrate // the setCharAt() Method. class GFG { public static void main(String[] args) { // create a StringBuffer object // with a String pass as parameter StringBuffer str = new StringBuffer("Geeks For Geeks"); // print string System.out.println("String = " + str.toString()); // set char at index 4 to '0' str.setCharAt(7, '0'); // print string System.out.println("After setCharAt() String = " + str.toString()); } } Output: String = Geeks For Geeks After setCharAt() String = Geeks F0r Geeks Example 2: To demonstrate IndexOutOfBoundsException. Java // Java program to demonstrate // Exception thrown by the setCharAt() Method. class GFG { public static void main(String[] args) { // create a StringBuffer object // with a String pass as parameter StringBuffer str = new StringBuffer("Geeks for Geeks"); try { // pass index -1 str.setCharAt(-1, 'T'); } catch (Exception e) { System.out.println("Exception:" + e); } } } Output: Exception:java.lang.StringIndexOutOfBoundsException: String index out of range: -1 References: https://docs.oracle.com/javase/10/docs/api/java/lang/StringBuffer.html#setCharAt(int, char) Comment More infoAdvertise with us Next Article StringBuffer setCharAt() method in Java with Examples A AmanSingh2210 Follow Improve Article Tags : Java java-basics Java-lang package Java-Functions java-StringBuffer +1 More Practice Tags : Java Similar Reads StringBuffer reverse() Method in Java with Examples The Java.lang.StringBuffer.reverse() is an inbuilt method that is used to reverse the characters in the StringBuffer. 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