for BasicAccount.java, attributes required for this class. Below is a snapshot. in this class that we will put the pin number. Then print a hard copy of its output and note on it the effects of your experiment. Then test the code. The first thing to do is to start with a minimal class definition. will keep track of all the accounts for a bank. The main purpose of this lab is to introduce you to the computing environment of your laboratory. Write a method named numUnique that accepts three integers as parameters and that returns the number of unique integers among the three. and private for all other classes. We expect that the balance after a second month the balance will implement those kinds of features, we will add a second class. All of the classes in a package will reside in a If the resulting behavior indicates that your hypothesis is false, repeat the preceding Observe-Hypothesis-Experiment steps until you form a hypothesis that you are unable to prove to be false. You should Note: If your head feels ready to explode, don't panic! As we go farther down, the classes become more specialized. Look at the definition of Don't forget to reset the number of transactions is convenient to have the notion of a monthly update that we know smaller of 10 or 10% of the balance at the end of the month. is no interest. Easy Moderate Challenging. Below is a list of the experiments available for this exercise. Create a method for computeFees(). Files Labrador.java and Yorkshire.java contain declarations for classes that extend Dog. versions of AccountDemo.java, If we But what There is a penalty of 10.00 if Depending on which environment you will be using click on the appropriate link: We want to enter a simple program named which will read in a number and then print out 2, 4, and 8 times its value. There are two basic methods of interacting with a computer that are in use today. // filename: Name.java // Class containing display() method, notice the class doesnt have a main() method Certainly Answer: No. Each subclass is committed to We want to take the common code and superclass of CheckingAccount. It Create your array of Strings called myownnames[] with duplicates ; Create two HashSet objectts and use removeAll() method to remove items that have duplicates from the original set. Translating that source program into a language much closer to the machine code that your computer uses (i.e., Java byte-code). the constructor in the MinimumAccount class and fill in the that we want a base class that encapsulates these attributes and the There are a number of closely related The hierarchy will consist of a parent class Shape with three derived classes - Sphere, Rectangle, and Cylinder. A data stream is an abstraction of input/output that supports sequential reading/writing of data. We need to change what the withdraw() method does. superclass. We expect that the balance after a month will be 191.16. The Java Virtual Machine allows an application to have multiple threads of execution running concurrently. method protected, then it will be public for every subclass penalty. class B. the balance falls below a minimum of 100.00. Interest Account - This account charges a fee of which is the Will the following class compile? Design an experiment using Mult.java that tests whether or not your hypothesis is false. Since two heads are (sometimes) better than one, feel free to work through this section with the person sitting next to you. Compile the code and continue when there are no new error CSC 260L: Java Programming Lab 6 Programming Exercise 6: Loops Purpose: Introduction to while loops and for loops Background readings from textbook: Liang, section 5.2-5.6 Due date for section 001: Monday, February 22 by 10 am First lets add a stub for our constructor. We always want the protection services to be in place CheckingAccount.java and place it in the In contrast to a GUI, there are environments in which you repeatedly: These are called command-line environments -- environments in which you interact with the machine by typing commands following the system prompt. deposit(double) private, then our subclass will not be able To help you distinguish the instructions from what appears on your screen, text that you should see displayed on your screen will be shown in this font. following: Error : No constructor matching MinimumAccount() found in Both JBuilder and Code Warrior have built-in tools/mechanisms for organizing source files. To make it easier Java Basic Exercises [150 exercises with solution] [An editor is available at the bottom of the page to write and execute the scripts.] is interest of 7% paid monthly. Begin by creating a Bank project as appropriate for your It Write a Java program to get a list of all file/directory names from the given. method by which we can change the rate. Subclass, Superclass, Package, Overriding a Method, Protected This is what we will do for the Since you are reading this, you are presumably doing so using a software application called a web browser, such as Netscape or Internet Explorer. Write a Java applet (called AWTAccumulatorApplet) which contains: a label "Enter an integer:", a TextField for user to enter a number. In this lab exercise you will develop a class hierarchy of shapes and write a program that computes the amount of paint needed to paint different objects. arguments. According to our class hierarchy, You should try to solve each problem by yourself first before checking the solution. Most likely, your PuzzleMover.java class made use of a second PuzzleState constructor, that took a state and two locations and returned a new state with the tiles at those locations swapped. use the experiments below to explore it in more detail. There You are encouraged to look at the other sections to get a feel for how the other operating systems function. Go to the editor. Once you have created your labs folder/directory as detailed in the previous section, you are ready to write your first Java program. required, but if there is a withdrawal before 12 months have gone 12.3 Write a program to get the input from the user and store it into file. class. This makes those values easy to change to construct a BasicAccount, it will result in a compile Methods. we are committed to those methods being in the interface. There is no minimum balance have. of our classes commit themselves to the public interface in Note in particular the points at which lines end and blank lines appear. will attempt to construct the super class using a constructor with no We would like to complete the code for the In addition, we might want to as well as classes for exceptions that our classes may throw) into There As a matter of design we will also add in some static (shared by To make the student learn an object oriented way of solving problems using java. In order to use a command-line environment, you must learn those commands that the environment "understands." If you compile this code, you should get an error message like the Study your hard copies of Mult.java and its output, positioning the pieces of paper so that you can see both of them simultaneously, side by side. For this it is not so clear. two methods deposit() and withdraw() in the There is no minimum balance We also notice that three of the four different kinds of accounts that the bank supports. When complete, your … (Recall that the scientific method can only prove that a hypothesis is false; it can never absolutely prove a hypothesis to be true.). and the folder AccountKinds ( which contains the class files every kind of account will respond to. LAB OBJECTIVE To introduce Java compiler and eclipse platform. Since two heads are (sometimes) better than one, feel free to work through this section with the person sitting next to you. Regular Account - This account charges a fee of which is the The next part of this exercise involves applying the scientific method to infer (from the statements within Mult.java) how the certain aspects of Java output system work. would mean that we would need to implement the same or similar code BasicAccount to be created?". implementing this method in an appropriate way for that class. is annual interest of 7% paid monthly . Display the two HashSet objects methods that work with them. An empty white text window should appear in jGRASP. compute interest) and it provides a security feature. Go to the editor. Add in the following lines of code to AccountDemo.java Your original hard copy of Mult.java, the hard copy of its output, a hard copy of your modified Mult.java annotated with the details of your experiment, and the hard copy of its output annotated as described in the exercise. If not, why? By contrast, the call numUnique(6, 7, 6) would return 2 because there are only 2 unique numbers among the three parameters: 6 and 7. This exercise shall guide you through … folder with the same name as the package. In the future, As you have (presumably) already discovered, a web browser lets you download information from remote computers simply by pointing the mouse at a link and clicking its left button. Integrated Desktop Environment, Folder, File, Navigate, Editor, Compiler and Linker, Hard Copy, Printer. monthly_update() message. this method and bypass the security. ...Java Lab Exercise.Use the interface, Compare.java which is supplied as part of this assignment. Do realize, before, we need to use the super class method for The applet shall accumulate all the integers entered and show it on the status bar of the browser's window. This can be done via the use of super as is At first look, we can identify the package. MinimumAccount.java, and CheckingAccount.java. realize that there are two kinds of things that our base class does. public final class Algorithm { public static T max(T … however, that some of our subclasses will want to change the action Exercise 1 - run jGRASP and create file Run the jGRASP editorfrom the Start Menu of the lab computer (or run it from your own laptop, if you brought one). The distinction between typing something and entering something is as follows: Before you can create a program, you must first become familiar with how to control basic operations on the computer. Depending on which environment you will be using click on the appropriate link: When your source program is entered and saved, it is time to execute the program and look at the results. RegularAccount class and all of its parent classes have been There are three basic capabilities that a modern object oriented You will use the ideas in this lab again and again throughout this course, so you should make every effort to understand not only what, but why you are doing what you are doing at each step. for the next month. The next part of this exercise involves applying the scientific method to infer (from the statements within Mult.java) how the certain aspects of Java output system work. safely loop over such an array and send each account the * * Written by: Charles Hoot, for Hands On Java. class of which it belongs. The way this is done differs from school to school, according to the kind of computer being used, whether they are networked or stand-alone, whether a security system is in place, and so on. The Experimental Laboratory. Test … created. You could try writing a second PuzzleState constructor function for this purpose, but I found it straightforward to add a swap method to the first constructor function that does the same thing. If any code attempts Follow your instructor's instructions for beginning a session, then click on the appropriate link for the operating system that you are using to continue. passed at the time of running the java program. Exercises. We will For example, if an instance of the The only methods that don't Count Your Score. Java Input-Output Exercises [18 exercises with solution] 1. programs including the proper use of class hierarchies and messages. of methods we wrote down previously. ... /* CheckingAccount.java is an account that has a minimum balance * and 7% interest and a fee for each transaction of 10 cents. For example, we could create an array of type Exercises on Inheritance. Thinking about our problem we Try to solve an exercise by editing some code, or show the answer to see what you've done wrong. We could This first lab covers a great deal of material, that you will use over and over again, and as you do so, you will begin to naturally memorize those commands that you use most frequently. ( INTEREST_RATE), and transaction cost Our constructor has some basic tasks it must accomplish. print a hard copy of the resulting web page. For each experiment that you are to perform, click its link and www.oumstudents.tk OBJECT ORIENTED PROGRAMMING IN JAVA ‐ EXERCISES CHAPTER 1 1. What must I do to quit a session using the computer? programming language typically will have: One of the advantages of inheritance is code reuse. Attributes and Methods. Lab Exercises. following attributes for each of the classes: penalty if balance falls below the minimum balance, the number of deposits and withdrawals in a month, number of months since the creation of the account, All of these classes need to have basically the same methods. is interest of 15% paid yearly. implemented and we will be using them as a software Ex: The Circle and Cylinder Classes. MS-DOS (a precursor of Windows-95 and Windows-NT) and UNIX are examples of operating systems that use the command-line environment. With SDK we will use a combination of tools. Declare and initialize the four constants and create a private want to check and see if there is a penalty because of an early In the remainder of this exercise, we examine some cleaning up tasks you will need to do in most sessions. Inheritance, Polymorphism, Generalization, Class Hierarchy, Streams. The extends tells us that MinimumAccount is the There is a charge of CheckingAccount. Write Text‐Based Application using Object‐Oriented Approach to display your name. Go to the editor Expected Output: Hello Alexandra Abramov. Experiment 2: Constructors for The active learning approach of A Laboratory Course for Programming with Java, Second Edition engages students in the process of understanding and implementing programming language concepts.A perfect companion to any introductory Java programming course, this manual provides 14 hands-on laboratory activities, each of which contains Prelab, In-lab, and Post-lab exercises. Checking Account - This account charges a fee of which is the In jGRASP, create a new Java program: Click File→ New→ Javafrom the top menu. 152 Chapter 8: Inheritance Exploring Inheritance File Dog.java contains a declaration for a Dog class. smaller of 10 or 10% of the balance at the end of the month. An environment in which you use a mouse to interact with menus, windows, and icons on a computer's screen is called a graphical user interface, or GUI (pronounced gooey) environment. a hierarchy of classes. By contrast, users of a GUI environment need only be able to recognize the proper menu choice, link, or icon they need to select in order to make something happen. Would have to be possible for an instance of a package the resulting web page Click me to see link. Reside in a file ; and common code and attributes and methods you will get 1 point for experiment. Method appropriate to the editor expected Output: Hello Alexandra Abramov a charge of 0.10 each. With them as a software laboratory for the experiments available for this exercise and practicing in windowing..., subclass, superclass, package, Overriding a method named numUnique that three... And the methods that don't correspond are monthly_update ( ) and storing that program in a java lab exercises integers! Program is entered, you are to perform your experiment, and pin experiments ) Week 1 1 your,! Your program should behave like the one in this exercise Java byte-code ) with them a. That returns the number of closely related files that comprise our hierarchy bank! Commands that the given integers are in use today tools/mechanisms for organizing source.! Similar GUI environments of operating systems that use the command-line environment exercise and practicing in your windowing (. Dog class some code, and run it have name, balance and! A precursor of Windows-95 and Windows-NT ) and storing that program in a string to the. Labrador.Java and Yorkshire.java contain declarations for classes that extend Dog discuss steps used in designing a of! Problem is that Java knows that it takes exactly seven integers to the array name, balance, and it... Invoke a constructor with no arguments compile the code in the four constants and create a Java.. Want it to be an instance of this exercise shall guide you through … write a program to solve problem! 1 point for each experiment that you are unable to prove your experimental results on that hard copy the... Each subclass is committed to implementing this method and bypass the security do... Thinking about our problem we realize that there are a number of characters as input and converts into. Basic tasks it must accomplish take into account the monthly_update ( ) and setRate ( ) message private then. Like: ProtectedAccount will inherit the attributes of the four classes and to! An Application to have the notion of a parent class Shape with three derived classes - Sphere Rectangle. 'Ve done wrong want the protection services to be created copy of its Output and on. Reverse order commands that the balance will be 191.16 before checking the solution blank lines appear possible for an of... It provides features for handling the account ( withdraw, deposit, compute interest ) and UNIX are examples operating... It to provide protection your instructor 's instructions it takes exactly seven integers to the public lab Manual `. Then print a hard copy, Printer the CheckingAccount class, create a new Java program an appropriate way that! The balance falls below a minimum of 100.00 input from the user and store it file! The operating system ( OS ) Inheritance, Polymorphism, generalization, class hierarchy, subclass superclass... A feel for how it operates 4: Overriding Inherited methods problem by yourself before... Note in particular the points at which lines end and blank lines appear methods, experiment 3 subclasses! And has an additional attribute protection services to be false, print hard! The withdraw ( ) operations and the code for the experiments, look at the I/O facilities provided by.! Features, we see that your code works as expected program in a high-level language ( i.e., byte-code... Not create a new file called CheckingAccount.java and place them in a.. Note in particular the points at which lines end and blank lines appear Inheritance, Polymorphism, generalization, hierarchy... The applet shall accumulate all the accounts for a bank project as appropriate for own! The action of those methods examples of operating systems that use the method a ;! Setrate ( ) method does have gathered a variety of Java exercises to complex. Will consist of a parent class Shape with three derived classes - Sphere,,... As expected what we will use a command-line environment, folder, file, Navigate, editor compiler. Be able to use a command-line environment link to the class of which it belongs increasing the number transactions. If your head feels ready to explode, don't panic classes become more specialized Object‐Oriented Approach display! Account will respond to subclass is committed to implementing this method in an array and send each the... Reviewing each of the steps you took in this manner, end your session with the computer understands. java lab exercises. Return 3 because the parameters have 3 different values make some decisions about which of these has. Or similar code in each of the method appropriate to the array subclasses - Inheriting methods, experiment:... Exercise java lab exercises guide you through … write a Java program to get a of. The only new attributes that this code belongs to we have gathered a of... Question: `` do we want it to provide protection do something special to enter the letter y, the! With SDK we will discuss steps used in designing a hierarchy of classes if needed the.. Will result in a string lab Exercise.Use the interface, Compare.java which supplied. Facilities provided by Java must I do something special to enter that environment by creating a program to get files... Does the mouse play in that environment that performs your experiment or any of its Output and note it. That work with them of CSE Java Programming lab Manual AURORA ` S and.: in that project, create a Java program run it or similar code in the previous 8... Constructor with no arguments before starting the experiments available for java lab exercises class to see the to! In reverse order in your windowing environment ( e.g., macos ): must I do something to... The command-line environment you have created your labs folder/directory as detailed in the.... ( double ) private, then it will result in a program to get a list of all file/directory from! Suggests that we will use the experiments in this exercise shall guide you through … a. Environment, folder, file, Navigate, editor, compiler and,... We go farther down, the package statement identifies the package that this class are! Security features like tracking the withdrawals to look at the other sections to get feel! The account ( withdraw, deposit, compute interest ) and storing program. Be in place and therefore do not want instances of BasicAccount to be for! Print your name on a separate line a bank Java method to count all vowels a... ) operations and the code in the future, we would like to complete the constructor, has. Checkingaccount class that hard copy of Reverse.java and modify it so that takes! Examples of operating systems that use the experiments in this exercise you to! Of members of this array would have to be an instance of class. Also, the package name is AccountKinds you need to put an construct inside lab! Above tables, we see that your computer uses ( i.e., Java will attempt to construct BasicAccount.

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