Question #13) (2 marks) When using the showinputDialog method of the JOptionPane class mention two things you should do to ensure the user enters at least one character of text. Question #16) (4 marks) (a) Explain why any class in Java can be declared as type Object even if it is instantiated as a class the programmer creates. (b) What restrictions apply to the methods called when the object is declared in the above way? (c) How could the programmer temporarily get around the restrictions in part (b) and what is a risk of using this approach? Question #14) (5 marks) Draw an appropriate UML diagram from the code below: public class Java Program extends Older Program { int type; Another Program variable; public double computeAverage(int[] values) { for(int i=0; i