Catching Exception Using Class Exception - Java

Write a program that demonstrates how various exceptions are caught with catch (Exception exception) This time, define classes ExceptionA (which inherits from class Exception) and ExceptionB (which inherits from class ExceptionA). In your program, create try blocks that throw exceptions of types ExceptionA, ExceptionB, NullPointerException and IOException. All exceptions should be caught with catch blocks specifying type Exception.

Java question - abstract classes and interfaces

Compare and contrast abstract classes and interfaces. Why would you use an abstract class? Why would you use an interface?

Java Programming

1. Describe the relationship between a GUI component and events? What is the programmer’s responsibility when developing a GUI, event-driven program? 2. List two advantages and two disadvantages of using UML as a modeling standard for Object-Oriented programs.

Find the error(s) in the following recursive method

Find the error(s) in the following recursive method, and explain how to correct it (them). This method should find the sum of the values from 0 to n. public int sum( int n ) { if ( n == 0 ) return 0; else return n + sum( n ); } // end method sum

Recursive power Method - Java

Write a recursive method power( base, exponent ) that, when called, returns exponent base For example, power( 3,4 ) = 3*3*3*3. Assume that exponent is an integer greater than or equal to 1. [Hint: The recursion step should use the relationship exponent exponent-1 base = base*base and the terminating condition occurs when exponent is equal to 1, because 1 base = base Incorporate this method into a program that enables the user to enter the base and exponent.]