Ex 8. 1 Extend the program in Fig. 8.21Fig. 8.23 to randomly draw rectangles and ovals. Create classes MyRectangle and MyOval. Both of these classes should include x1, y1, x2, y2 coordinates, a color and a boolean flag to determine whether the shape is a filled shape. Declare a constructor in each class with arguments for initializing all the instance variables. To help draw rectangles and ovals, each class should provide methods getUpperLeftX, getUpperLeftY, getWidth and getHeight that calculate the upper-left x-coordinate, upper-left y-coordinate, width and height, respectively. The upper-left x-coordinate is the smaller of the two x-coordinate values, the upper-left y-coordinate is the smaller of the two y-coordinate values, the width is the absolute value of the difference between the two x-coordinate values, and the height is the absolute value of the difference between the two y-coordinate values.

(Sales Commissions) Use a one-dimensional array to solve the following problem: A company pays its salespeople on a commission basis. The salespeople receive $200 per week plus 9% of their gross sales for that week. For example, a salesperson who grosses $5000 in sales in a week receives $200 plus 9% of $5000, or a total of $650. Write an application (using an array of counters) that determines how many of the salespeople earned salaries in each of the following ranges (assume that each salesperson's salary is truncated to an integer amount):

A parking garage charges a $2.00 minimum fee to park for up to three hours. The garage charges an additional $0.50 per hour for each hour or part thereof in excess of three hours. The maximum charge for any given 24-hour period is $10.00. Assume that no car parks for longer than 24 hours at a time. Write an application that calculates and displays the parking charges for each customer who parked in the garage yesterday. You should enter the hours parked for each customer. The program should display the charge for the current customer and should calculate and display the running total of yesterday's receipts. The program should use the method calculateCharges to determine the charge for each customer.

4.21 - The process of finding the largest value (i.e., the maximum of a group of values) is used frequently in computer applications. For example, a program that determines the winner of a sales contest would input the number of units sold by each salesperson. The salesperson who sells the most units wins the contest. Write a pseudocode program and then a Java application that inputs a series of 10 integers and determines and prints the largest integer. Your program should use at least the following three variables:

5.24 - Write an application that prints the following diamond shape . You may use output statements that print a single asterisk (*), a single space or a single newline character. Maximize your use of repetition (with nested for statements), and minimize the number of output statements.

DiamondTest.java

4.17

Drivers are concerned with the mileage their automobiles get. One driver has kept track of several tankfuls of gasoline by recording the miles driven and gallons used for each tankful. Develop a Java application that will input the miles driven and gallons used (both as integers) for each tankful. The program should calculate and display the miles per gallon obtained for each tankful and print the combined miles per gallon obtained for all tankfuls up to this point. All averaging calculations should produce floating-point results. Use class Scanner and sentinel-controlled repetition to obtain the data from the user.

Exercise: 2.31 Using only the programming techniques you learned in this chapter, write an application that calculates the squares and cubes of the numbers from 0 to 10 and prints the resulting values in table format, as shown below. [Note: This program does not require any input from the user.

Solution :

 lab2.java