StringBuilder setCharAt() in Java with Examples
The setCharAt(int index, char ch) method of StringBuilder class is used to set the character at the position index passed as ch. This method changes the old sequence to represents a new sequence which is identical to old sequence only difference is a new character ch is present at position index. The index argument must be greater than or equal to 0, and less than the length of the String contained by StringBUilder object.
Syntax:
public void setCharAt(int index, char ch)
Parameters:
This method accepts two parameters:
- index – Integer type value which refers to the index of character you want to set.
- ch – Character type value which refers to the new char.
Returns:
This method returns nothing.
Exception:
If the index is negative, greater than length() then IndexOutOfBoundsException.
Below programs illustrate the java.lang.StringBuilder.setCharAt() method:
Example 1:
// Java program to demonstrate // the setCharAt() Method. class GFG { public static void main(String[] args) { // create a StringBuilder object // with a String pass as parameter StringBuilder str = new StringBuilder("WelcomeGeeks"); // print string System.out.println("String = " + str.toString()); // set char at index 2 to 'L' str.setCharAt(2, 'L'); // print string System.out.println("After setCharAt() String = " + str.toString()); } } |
chevron_right
filter_none
Output:
String = WelcomeGeeks After setCharAt() String = WeLcomeGeeks
Example 2:
// Java program to demonstrate // the setCharAt() Method. class GFG { public static void main(String[] args) { // create a StringBuilder object // with a String pass as parameter StringBuilder str = new StringBuilder("Tony Stark will die"); // print string System.out.println("String = " + str.toString()); // set char at index 9 to '1' str.setCharAt(9, '1'); // print string System.out.println("After setCharAt() String = " + str.toString()); } } |
chevron_right
filter_none
Output:
String = Tony Stark will die After setCharAt() String = Tony Star1 will die
Example 3: When negative index is passed:
// Java program to demonstrate // Exception thrown by the setCharAt() Method. class GFG { public static void main(String[] args) { // create a StringBuilder object // with a String pass as parameter StringBuilder str = new StringBuilder("Tony Stark"); try { // pass index -15 str.setCharAt(-15, 'A'); } catch (Exception e) { e.printStackTrace(); } } } |
chevron_right
filter_none
Output:
java.lang.StringIndexOutOfBoundsException: String index out of range: -15
at java.lang.AbstractStringBuilder.setCharAt(AbstractStringBuilder.java:407)
at java.lang.StringBuilder.setCharAt(StringBuilder.java:76)
at GFG.main(File.java:16)
Refrences:
https://docs.oracle.com/javase/10/docs/api/java/lang/StringBuilder.html#setCharAt(int, char)
Recommended Posts:
- StringBuffer setCharAt() method in Java with Examples
- StringBuilder delete() in Java with Examples
- StringBuilder capacity() in Java with Examples
- StringBuilder codePointBefore() in Java with Examples
- StringBuilder Class in Java with Examples
- StringBuilder codePointCount() in Java with Examples
- StringBuilder charAt() in Java with Examples
- StringBuilder replace() in Java with Examples
- StringBuilder deleteCharAt() in Java with Examples
- StringBuilder ensureCapacity() in Java with Examples
- StringBuilder setLength() in Java with Examples
- StringBuilder subSequence() in Java with Examples
- StringBuilder reverse() in Java with Examples
- StringBuilder codePointAt() in Java with Examples
- StringBuilder getChars() in Java with Examples
If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.
