Effective Java - Always override toString() method

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Ferdous Mahmud Shaon

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Effective Java - Item 9 ,[object Object],[object Object],[object Object],[object Object],[object Object]

Item 9 :: Always override toString() ,[object Object],[object Object],[object Object]

Always override toString() - contd ,[object Object],[object Object],[object Object]

Always override toString() - contd ,[object Object],[object Object]

Always override toString() - contd ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Always override toString() - contd ,[object Object],[object Object],[object Object],[object Object]

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INPUT AND OUTPUT PROCESSING Please note that the material on this website is not intended to be exhaustive. This is intended as a summary and supplementary material to required textbook. INTRODUCTION Most computer programs spend very little processing time in obtaining input and producing output. Most of the work goes into the processing in between. The exception to this generalization is non- browser-based graphical user interfaces (GUIs). In these programs, often over 50% of the code can be dedicated to user input and output. In browser-based user interfaces, the browser does a lot of the work for you. Input/output (I/O) comes in two flavors: interactive and non-interactive. Interactive I/O involves prompting the user for the input and displaying the output on the user's monitor. Non-interactive I/O involves reading and writing files, which for us will be text files. INTERACTIVE I/O The majority of interactive I/O is accomplished in C++ using cin and cout. For now all interactive I/O comes from and goes to the console window. Recall that in order to use cin and cout we have to #include <iostream>. The cin input stream views the input the user types as if the data came from a text file. But, cin ignores as data all whitespace characters: the newline, the tab, and the space. As a result cin does some input formatting for the program, and only assigns non-whitespace data to the input variables. If the user is entering several data items on one line (in the console window), cin will wait for the user to press the newline (Enter or Return) key before it will process the line of input data. The input stream can consist of any array of characters, representing: integers, decimals, strings, single characters, .... Each array of characters is delimited by whitespace characters, and cin will interpret any of the whitespace characters as a delimiter (with some exceptions, of course). When we invoke cin we always have to specify a variable in which to place the user input; that variable must have a type. And, cin is very persnickety about types. If cin is expecting an integer, it will not read an alphabetic character; it will generate an error condition. In the following code snippet cin will expect to see a single character, an integer, a decimal, and a string, in that order. char yOrN; int userID; double hourlyWage; string lastName; ... cin >> yOrN >> userID >> hourlyWage >> lastName; If the user typed the last name for the userID, cin will flag an error and not continue to read the input stream until your program deals with that error (see below). The cout output stream has a lot more variety to it; cout is aware of the types of variables passed to it, and will format them accordingly, unless your program specifies another format to use. When thinking about the arrangement of your program's output, consider each string of output characters as a field, and the contents of each line of output as an array of fields. T.

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data.txt International Business Management l2 Consulatation fee // error Imperial Chemical 234 Pest control chemicals National Home Appliances 34S6 Coffee machines // error MicroHeart Software Consultancy 45678 Security audit University of Silver Quartet 5678 Facility management Telstar Satellite Communication 67O Disconnection fee // error data_c.txt Imperial Chemical 234 Pest control chemicals MicroHeart Software Consultancy 45678 Security audit University of Silver Quartet 5678 Facility management sample_isdigit.cpp #include <iostream> #include <cctype> using namespace std; int main(){ char a = 'A'; char b = '3'; char c = ' '; if (isdigit(a)){ cout << a << " is a digit!" << endl; } else { cout << a << " is not a digit!" << endl; } if (isdigit(b)){ cout << b << " is a digit!" << endl; } else { cout << b << " is not a digit!" << endl; } if (isdigit(c)){ cout << c << " is a digit!" << endl; } else { cout << c << " is not a digit!" << endl; } return 0; } CSC2402 A3_2015_updated.pdf CSC2402 Assignment 3 This assignment is marked out of 100 marks. It is worth 10 % of your overall course mark. Submit your assignment on‐line using the link to Assignment 3 on the course web page. Assignment 3 consists of one task. For Assignment 3 you must submit all four files listed below in a single ZIP file (not RAR). All four files must be in pure text format. No PDF, HTML, Word files, Open Office files, RTF etc. and no compression or archiving such as zip, rar, tar etc. Please name your files to match the names listed.  task_3.cpp – holds main() function,  exception.cpp – class file for exception handler functions,  exception.h – class definition file for exception handler functions, and  task_3.txt – copy of compilation messages and sample runs. The steps to copy the compilation messages and sample runs for the task_3.txt file are software dependent:  If you are using Codelite, the compilation messages can be copied and pasted with the usual crtl‐c and crtl‐v. For output of sample runs, right click the title bar of the command window, select EDIT/MARK and then highlight the output. With the output selected, right click the title bar of the command window, select EDIT/COPY. Position your cursor to a (new) text file opened in a text editor such as Notepad, and crtl‐v will paste the copied output to the text file.  If you are using MinGW, right click the title bar of the command window; select EDIT/MARK and then high light the output. With the output selected, right click the title bar of the command window, select EDIT/COPY. Position your cursor to a (new) text .

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