Defining Your Own Exceptions, Throwing Your Own Exception : Exception « Development « Java Tutorial

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class DreadfulProblemException extends ArithmeticException {
  public DreadfulProblemException() {
  }
  public DreadfulProblemException(String s) {
    super(s); 
  }
}
public class MainClass{
  public static void main(String[] a){
    int[] array = new int[]{1,0,2};
    int index = 0;
    try {
      System.out.println("First try block in divide() entered");
      array[index + 2] = array[index]/array[index + 1];
      System.out.println("Code at end of first try block in divide()");
    } catch(ArithmeticException e) {
      System.out.println("Arithmetic exception caught in divide()");
      throw new DreadfulProblemException("index + 1");    // Throw new exception
    } catch(ArrayIndexOutOfBoundsException e) {
      System.out.println(
                  "Index-out-of-bounds index exception caught in divide()");
    }
    System.out.println("Executing code after try block in divide()");
  }
}

First try block in divide() entered
Arithmetic exception caught in divide()
Exception in thread "main" DreadfulProblemException: index + 1
  at MainClass.main(MainClass.java:20)