StringIndexOutOfBoundsException

The StringIndexOutOfBoundsException is an exception that occurs when a String method tries to use an index that is either negative or greater than the size of the String.

Example

The following example creates a StringIndexOutOfBoundsException:

public class ErrorExample {
  public static void main(String[] args) {
    String greeting = "Hello World";
    System.out.println(greeting.charAt(-1));
  }
}

The output is something like this:

Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: -1
    at java.base/java.lang.StringLatin1.charAt(StringLatin1.java:48)
    at java.base/java.lang.String.charAt(String.java:1512)
    at ErrorExample.main(ErrorExample.java:4)