String charAt()

Example

The charAt() function returns the character in a string at the given index. The first character has an index of 0, and the second has an index of 1, and so on.

Program:

public class Stringoperation4  
{  
    public static void main(String args[])  
    {  
        String str="CodingNinjas";    
        System.out.println(str.charAt(0));//C    
        System.out.println(str.charAt(6));//N    
    }  
}

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Output:

C
N

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Let's look at using the charAt() function with a higher index value. At runtime, it throws a StringIndexOutOfBoundsException in this situation.

Program:

public class charExample{  
    public static void main(String args[]){  
        String str="codingninjas";  
        char ch=str.charAt(20);//returns char at the 10th index  
        System.out.println(ch);  
    }
}  

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Output:

Exception in thread "main" java.lang.StringIndexOutOfBoundsException:
String index out of range: 20
at java.lang.String.charAt(String.java:658)
at charExample.main(charExample.java:4)

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Frequently Asked Questions

What is a string class in Java?

The java.lang.String class in Java has a multitude of built-in methods for manipulating strings. We may execute actions on String objects using these methods, such as cutting, concatenating, converting, comparing, and replacing strings.

What do you mean by strings being immutable?

String objects are immutable in Java, meaning they can't be updated or modified. A string object's data or state cannot be changed after being created.

Which type of indexing is used in the charAt() method?

0-based indexing is used while using the charAt() method. The first character has an index of 0; the second has an index of 1, and so on.

Conclusion

In this article, we have extensively discussed the string class method charAt() of the java programming language with various examples.

We hope this blog has helped you enhance your charAt() method knowledge. If you would like to learn more, check out our articles on Understanding Strings, Strings Operations, and String Interview Questions In Java.

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