String charAt() Method in Java with Example

Details

Why use string "charAt" Method?

The charat method returns the character at the definite index. In this method index value should be between 0 and string length minus 1

Method Syntax:

public char charAt(int index)

Parameter input:

index – This Java method accepts only single input which is an int data type.

Method Returns:

This method returns a character type data based on the index input

Exception:

Throws java.lang.StringIndexOutOfBoundsException if index value is not between 0 and String length minus one

Example 1:

public class CharAtGuru99 {
    public static void main(String args[]) {
        String s1 = "This is String CharAt Method";
        //returns the char value at the 0 index
        System.out.println("Character at 0 position is: " + s1.charAt(0));
        //returns the char value at the 5th index
        System.out.println("Character at 5th position is: " + s1.charAt(5));
        //returns the char value at the 22nd index
        System.out.println("Character at 22nd position is: " + s1.charAt(22));
        //returns the char value at the 23th index
        char result = s1.charAt(-1);
        System.out.println("Character at 23th position is: " + result);
    }
}

Output:

Character at 0 position is: T
Character at 5th position is: i
Character at 22nd position is: M

Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: -1

Some important things about this Java charAt method:

  • This Java method takes an argument which is always int type.
  • This method returns the character as char for the given int argument. The int value specifies the index that starts at 0.
  • If the index value is higher than string length or a negative, then IndexOutOfBounds Exception error occurs.
  • The index range must be between 0 to string_length-1.

 

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