// Java program to demonstrate working of chained exceptions
public class ExceptionHandling
{
    public static void main(String[] args)
    {
        try
        {
            // Creating an exception
            NumberFormatException ex =
                       new NumberFormatException("Exception");
  
            // Setting a cause of the exception
            ex.initCause(new NullPointerException(
                      "This is actual cause of the exception"));
  
            // Throwing an exception with cause.
            throw ex;
        }
  
        catch(NumberFormatException ex)
        {
            // displaying the exception
            System.out.println(ex);
  
            // Getting the actual cause of the exception
            System.out.println(ex.getCause());
        }
    }
}

java.lang.NumberFormatException: Exception
java.lang.NullPointerException: This is actual cause of the exception