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Java String charAt()

The java string charAt() method returns a char value at the given index number.

The index number starts from 0 and goes to n-1, where n is length of the string. It returns StringIndexOutOfBoundsException if given index number is greater than or equal to this string length or a negative number.

Internal implementation

Signature

The signature of string charAt() method is given below:

Parameter

index : index number, starts with 0

Returns

A char value

Specified by

CharSequence interface, located inside java.lang package.

Throws

StringIndexOutOfBoundsException : if index is negative value or greater than this string length.

Java String charAt() method example

Test it Now

Output:

t

StringIndexOutOfBoundsException with charAt()

Let's see the example of charAt() method where we are passing greater index value. In such case, it throws StringIndexOutOfBoundsException at run time.

Output:

Exception in thread "main" java.lang.StringIndexOutOfBoundsException: 
String index out of range: 10
at java.lang.String.charAt(String.java:658)
at CharAtExample.main(CharAtExample.java:4)

Java String charAt() Example 3

Let's see a simple example where we are accessing first and last character from the provided string.

Output:

Character at 0 index is: W
Character at last index is: l

Java String charAt() Example 4

Let's see an example where we are accessing all the elements present at odd index.

Output:

Char at 1 place e
Char at 3 place c
Char at 5 place m
Char at 7 place  
Char at 9 place o
Char at 11 place J
Char at 13 place v
Char at 15 place t
Char at 17 place o
Char at 19 place n
Char at 21 place  
Char at 23 place o
Char at 25 place t
Char at 27 place l

Java String charAt() Example 5

Let's see an example where we are counting frequency of a character in the string.

Output:

Frequency of t is: 4
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String charAt()
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