What is char charAt (int index) in Java, and how can I use it?

Java String charAt() method

The Java String charAt() method returns the character at the specified index. The index value should lie between 0 and length()-1.

Signature:
public char charAt(int index)
Parameter:
index- Index of the character to be returned.
Return:
returns character at the specified position.
Exception:
StringIndexOutOfBoundsException- If index is negative or greater then the length of the String.
Example:To show working of charAt() method

class Gfg {

    public static void main(String args[])

    {

        String s = "Welcome! to Java Planet";

  

        char ch = s.charAt(3);

        System.out.println(ch);

  

        ch = s.charAt(0);

        System.out.println(ch);

    }

}

Output:

c
W

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

// Java program to demonstrate // working of charAt() method class Gfg { public static void main(String args[]) { String s = "abc"; char ch = s.charAt(4); System.out.println(ch); } }
Output:

Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: 4
    at java.lang.String.charAt(String.java:658)
    at Gfg.main(File.java:9)