Probleme Java

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www.oumstudents.tk OBJECTORIENTEDPROGRAMMINGINJAVA ‐ EXERCISES CHAPTER 1 1. Write Text‐Based Application usingObject‐OrientedApproach to display your name. 2. Write a java Appletto display your age. 3. Write a program that calculates and printsthe product ofthree integers. 4. Write a program that converts a Fahrenheit degree to Celsius using the formula: 5. Write an application that displaysthe numbers 1 to 4 on the same line, with each pair of adjacent numbers separated by one space. Write the application using the following techniques: a. Use one System.out.println statement. b. Use four System.out.printstatements. c. Use one System. out. printfstatement. 6. Write an application that asksthe userto entertwo integers, obtainsthem from the user and printstheirsum, product, difference and quotient(division). CHAPTER 3 7. Write an application that asksthe userto entertwo integers, obtainsthem from the user and displaysthe larger numberfollowed by the words “islarger”. Ifthe numbers are equal, print “These numbers are equal” 8. Write an application thatinputsthree integersfrom the user and displaysthe sum, average, product,smallest and largest ofthe numbers. 9. Write an application thatreadstwo integers, determines whetherthe firstis a multiple ofthe second and print the result.[HintUse the remainder operator.] 10. The process offinding the largest value (i.e.,the maximum of a group of values)is used frequently in computer

applications. For example, a program that determinesthe winner of a sales contest would inputthe number of unitssold by each sales person. The sales person who sellsthe most units winsthe contest.Write a Java application thatinputs a series of 10 integers and determines and printsthe largestinteger. Your program should use atleastthe following three variables: a. counter:A counterto countto 10 (i.e.,to keep track of howmany numbers have been input and to determine when all 10 numbers have been processed). b. number: The integermostrecently input by the user. c. largest: The largest numberfound so far. 11. Write a Java application that useslooping to printthe following table of values: 12. Write a complete Java application to promptthe userforthe double radius of a sphere, and call method sphereVolumeto calculate and display the volume ofthe sphere.Use the following statementto calculate the volume: CHAPTER 4 13. Write statementsthat perform the following one‐dimensional‐array operations: d. Setthe 10 elements ofinteger array countsto zero. e. Add one to each ofthe 15 elements ofinteger array bonus. f. Display the five values ofinteger array bestScoresin column format. 14. Write a Java program thatreads a string from the keyboard, and outputsthe string twice in a row,first all uppercase and next all lowercase. If,forinstance,the string “Hello" is given,the outputwill be “HELLOhello" 15. Write a Java application that allowsthe userto enter up to 20 integer gradesinto an array. Stop the loop by typing in ‐1. Your main method should call an Average method thatreturnsthe average ofthe grades.Use the

DecimalFormat classto formatthe average to 2 decimal places. CHAPTER 5 16. Modify class Account(in the example)to provide a method called debitthat withdraws money froman Account. Ensure thatthe debit amount does not exceed theAccount’s balance. Ifit does,the balance should be left unchanged and the method should print a message indicating ―Debit amount exceeded account balance. Modify class AccountTest(intheexample)to test method debit. 17. Create a class called Invoice that a hardware store might use to represent an invoice for an item sold atthe store. An Invoice should include four pieces ofinformation asinstance variables‐a part number(type String),a part description(type String),a quantity ofthe item being purchased (type int) and a price peritem (double). Your classshould have a constructorthatinitializesthe fourinstance variables. Provide a set and a get method for each instance variable. In addition, provide a method named getInvoice Amountthat calculatesthe invoice amount(i.e., multipliesthe quantity by the price peritem),then returnsthe amount as a double value. Ifthe quantity is not positive, itshould be setto 0. Ifthe price peritem is not positive, itshould be setto 0.0.Write a test application named InvoiceTestthat demonstrates classInvoice’s capabilities. 18. Create a class called Employee thatincludesthree pieces ofinformation asinstance variables—a first name (typeString), a last name (typeString) and a monthly salary (double). Your classshould have a constructorthat initializesthe three instance variables. Provide a set and a get method for each instance variable. Ifthe monthly salary is not positive,setitto 0.0.Write a test application named EmployeeTestthat demonstrates class

Employee’s capabilities. Create two Employee objects and display each object’s yearly salary. Then give each Employee a 10% raise and display each Employee’s yearly salary again. 19. Create a class calledDate thatincludesthree pieces ofinformation asinstance variables—a month (typeint), a day (typeint) and a year(typeint). Your classshould have a constructorthatinitializesthe three instance variables and assumesthatthe values provided are correct. Provide a set and a get method for each instance variable. Provide a method displayDate that displaysthe month, day and yearseparated by forward slashes(/). Write a test application namedDateTestthat demonstrates classDate’s capabilities. CHAPTER 6 20. Create class SavingsAccount.Usea static variable annualInterestRate to store the annual interestrate for all account holders. Each object ofthe class contains a private instance variable savingsBalance indicating the amountthe saver currently has ondeposit. Provide method calculateMonthlyInterestto calculate the monthlywww.oumstudents.tk interest by multiplying the savingsBalance by annualInterestRate divided by 12 thisinterestshould be added to savingsBalance. Provide a static method modifyInterestRate thatsetsthe annualInterestRate to a new value. Write a program to test class SavingsAccount. Instantiate two savingsAccount objects,saver1 and saver2,with balances of $2000.00 and $3000.00,respectively. Set annualInterestRate to 4%,then calculate the monthly interest and printthe newbalancesfor both savers. Then setthe annualInterestRate to 5%, calculate the next month’sinterest and printthe new balancesfor both savers. 21. Create a class called Book to represent a book.A Book should include four pieces ofinformation asinstance

variables‐a book name, an ISBNnumber, an author name and a publisher. Your classshould have a constructor thatinitializesthe fourinstance variables. Provide a mutator method and accessor method (query method)for each instance variable. Inaddition, provide a method named getBookInfo thatreturnsthe description ofthe book as a String (the description should include allthe information aboutthe book). You should use this keyword in member methods and constructor. Write a test application named BookTestto create an array of objectfor 30 elementsfor class Book to demonstrate the class Book's capabilities. CHAPTER 7 22. a. Create a super class called Car. The Car class hasthe following fields and methods. ◦intspeed; ◦doubleregularPrice; ◦Stringcolor; ◦doublegetSalePrice(); b. Create a sub class of Car class and name it as Truck. The Truck class hasthe following fields and methods. ◦intweight; ◦doublegetSalePrice();//Ifweight>2000,10%discount.Otherwise,20%discount. c. Create a subclass of Car class and name it as Ford. The Ford class hasthe following fields and methods ◦intyear; ◦intmanufacturerDiscount; ◦doublegetSalePrice();//FromthesalepricecomputedfromCarclass,subtractthemanufacturerDiscount. d. Create a subclass of Car class and name it as Sedan. The Sedan class hasthe following fields and methods.

◦intlength; ◦doublegetSalePrice();//Iflength>20feet,5%discount,Otherwise,10%discount. e. Create MyOwnAutoShop class which containsthe main() method. Perform the following within the main() method. ◦Create an instance of Sedan class and initialize allthe fields with appropriate values.Use super(...) method in the constructorforinitializing the fields ofthe superclass. ◦Create two instances ofthe Ford class and initialize allthe fields with appropriate values.Use super(...) method in the constructorforinitializing the fields ofthe super class.www.oumstudents.tk ◦Create an instance of Car class and initialize allthe fields with appropriate values. Display the sale prices of all instance. CHAPTER 8 CHAPTER 9 23. Write an appletthat asksthe userto entertwo floating‐point numbers, obtainsthe two numbersfrom the user and drawstheirsum, product(multiplication), difference and quotient(division).Use the techniquesshown in example. CHAPTER 10 24. Create an appletthat can display the following component.No event handling is needed forthe components. 25. Create an appletthat can display the following component.No event handling is needed forthe components. CHAPTER 11 26. Temperature Conversion a. Write a temperature conversion appletthat convertsfromFahrenheitto Celsius. The Fahrenheittemperature

should be entered fromthe keyboard (via a JTextField). A JLabelshould be used to display the converted temperature.Use the following formula forthe conversion: Celcius = ((5/9)*(Ferenheit‐32)). b. Enhance the temperature conversion applet ofQ1 by adding the Kelvin temperature scale. The appletshould also allow the usertomake conversions between any two scales.Use the following formula forthe conversion between Kelvin and Celsius(in addition to the formulainQ1): Kelvin = Celcius + 273.15

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