Java String charAt() Method
What is String?
In Java, an string class is a series of characters that are interpreted literally by a script. The string can be either only letters or be letters and numbers in most programming languages.
Strings in Java are immutable, which means that once you create a string object, its value cannot be changed.you can create new strings by concatenating existing strings or by creating a new string that is a substring of an existing string.
To know more about String Class in java read the complete article.
String charAt() Method:
The charAt() method in Java is a method of the String class and is used to retrieve the character at a specified index in a string.
Note:StringIndexOutOfBoundsException is given when the given specified index number is equal to this string length or the specified given index number is greater, or it is a negative number. The first char value is at index 0
Index:
The index of the character to return is represented by an integer.
Throws:
if the given index number is greater than or equal to this string length or a negative number.
Returns:
The index of the character to return is an integer.
Syntax:
public char charAt(int index)
Let’s look at a string-related Java program where the charAt() method is used to perform an operation on the given string.
Examples : Return the Sixth character (6) of a string
public class Main {
public static void main(String[] args) {
String myStr = "Hello PrepInsta";
// returns character at index 6
char result = myStr.charAt(6);
System.out.println(result);
}
}
Output
P
Examples : Return the Fifteenth character (15) of a string
public class Main {
public static void main(String[] args) {
String myStr = "Hello PrepInsta";
// returns character at index 15
char result = myStr.charAt(15);
System.out.println(result);
}
}
Output
Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: 15 at java.lang.String.charAt(String.java:658) at Main.main(Main.java:4)
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