Java String Method charAt()

This method takes one integer argument and return a character specified at index position. For any string the index value starts from 0 to string length -1 position. If passed index value not in valid range then it throws IndexOutOfBoundsException.

For example string Hello Friends contains 13 characters starting from 0 to 12 H is first position with index value 0, F is in seventh position with index value 6 and s is in 13 position with index value 12.
Using numbre other then 0 to 12( 0 to length()-1) will result in IndexOutOfBountException

Signature:

public char charAt(int index)

Parameters:

index -Integer index value to get character at specified index position.

Return:

Character at passed index value.

Exception Throws:

IndexOutOfBoundsException If index value in not between 0 to String length()-1

Example

public class StringChatAtExample {

    public static void main(String args[]) {
        String test = "Java String charAt() example";
        char firstCharacter = test.charAt(0);
        char sixthCharacter = test.charAt(5);
        char lastCharacter = test.charAt(test.length() - 1);
        System.out.println("String:" + test);
        System.out.println("Character at first position: " + firstCharacter);
        System.out.println("Character at sixth position: " + sixthCharacter);
        System.out.println("Character at last position: " + lastCharacter);
    }

}

public class StringChatAtExample {

public static void main(String args[]) {

String test = "Java String charAt() example";

char firstCharacter = test.charAt(0);

char sixthCharacter = test.charAt(5);

char lastCharacter = test.charAt(test.length() - 1);

System.out.println("String:" + test);

System.out.println("Character at first position: " + firstCharacter);

System.out.println("Character at sixth position: " + sixthCharacter);

System.out.println("Character at last position: " + lastCharacter);

}

Result

String:Java String charAt() example
Character at first position: J
Character at sixth position: S
Character at last position: e

String:Java String charAt() example

Character at first position: J

Character at sixth position: S

Character at last position: e

Now Print all characters with its index value

Example

public class StringChatAtExample1 {
    public static void main(String args[]) {
        String test = "Java String charAt() example";
       for(int i=0;i&lt;=test.length()-1;i++){
           System.out.println("Character at  index value "+i+" = "+test.charAt(i));
       }
    }

}

public class StringChatAtExample1 {

public static void main(String args[]) {

String test = "Java String charAt() example";

for(int i=0;i<=test.length()-1;i++){

System.out.println("Character at index value "+i+" = "+test.charAt(i));

}

Result

Character at  index value 0 = J
Character at  index value 1 = a
Character at  index value 2 = v
Character at  index value 3 = a
Character at  index value 4 =  
Character at  index value 5 = S
Character at  index value 6 = t
Character at  index value 7 = r
Character at  index value 8 = i
Character at  index value 9 = n
Character at  index value 10 = g
Character at  index value 11 =  
Character at  index value 12 = c
Character at  index value 13 = h
Character at  index value 14 = a
Character at  index value 15 = r
Character at  index value 16 = A
Character at  index value 17 = t
Character at  index value 18 = (
Character at  index value 19 = )
Character at  index value 20 =  
Character at  index value 21 = e
Character at  index value 22 = x
Character at  index value 23 = a
Character at  index value 24 = m
Character at  index value 25 = p
Character at  index value 26 = l
Character at  index value 27 = e

Character at index value 0 = J

Character at index value 1 = a

Character at index value 2 = v

Character at index value 3 = a

Character at index value 4 =

Character at index value 5 = S

Character at index value 6 = t

Character at index value 7 = r

Character at index value 8 = i

Character at index value 9 = n

Character at index value 10 = g

Character at index value 11 =

Character at index value 12 = c

Character at index value 13 = h

Character at index value 14 = a

Character at index value 15 = r

Character at index value 16 = A

Character at index value 17 = t

Character at index value 18 = (

Character at index value 19 = )

Character at index value 20 =

Character at index value 21 = e

Character at index value 22 = x

Character at index value 23 = a

Character at index value 24 = m

Character at index value 25 = p

Character at index value 26 = l

Character at index value 27 = e