PPT-Chapter 2 Section 2.2 Console Input Using The Scanner CLASS

Slides prepared by Rose Williams Binghamton University Kenrick Mock University of Alaska Anchorage Console Input Using the Scanner Class Starting with version 50 Java includes a class for doing simple keyboard input named the . Chapter 11. Reading and Writing . Textfiles. Data is often stored in files such as a text file. We need to read that data into our program. Simplest mechanism. Scanner class. First construct a FileReader object with the name of the input file.. Dr. Andrew Wallace PhD . BEng. (hons) . EurIng. andrew.wallace@cs.umu.se. Overview. Problems. Handling problems. Input / output. Streams. Problems. What can go wrong?. Boundaries. P. roblems. User inputs. While Loops. Asserting Java. . © Rick Mercer. Algorithmic Pattern: . The Determinate loop. We often need to perform some action a specific number of times: . Produce 89 paychecks.. Count down to 0 (take 1 second of the clock).. June 9 Class . Meeting. Department of Computer Science. San Jose State University. Summer 2015. Instructor: Ron Mak. www.cs.sjsu.edu/~mak. Quiz 6 June 11. Take “Quiz 6 June 11” in Canvas before the start of Thursday’s class.. 2015.03.16. Front End. The purpose of the front end is to deal with the input language. Perform a membership test: code . . source language?. Is the program well-formed (semantically) ?. Build an . June 9 Class . Meeting. Department of Computer Science. San Jose State University. Summer 2015. Instructor: Ron Mak. www.cs.sjsu.edu/~mak. Quiz 6 June 11. Take “Quiz 6 June 11” in Canvas before the start of Thursday’s class.. Chapter 11. Reading and Writing . Textfiles. Data is often stored in files such as a text file. We need to read that data into our program. Simplest mechanism. Scanner class. First construct a FileReader object with the name of the input file.. Chapter 11. Reading and Writing . Textfiles. Data is often stored in files such as a text file. We need to read that data into our program. Simplest mechanism. Scanner class. First construct a FileReader object with the name of the input file.. Chapter 11. Reading and Writing . Textfiles. Data is often stored in files such as a text file. We need to read that data into our program. Simplest mechanism. Scanner class. First construct a FileReader object with the name of the input file.. Input / Output and Exception Handling Chapter 11 Reading and Writing Textfiles Data is often stored in files such as a text file We need to read that data into our program Simplest mechanism Scanner class Slides prepared by Rose Williams, . Binghamton University. . Kenrick Mock, . University of Alaska Anchorage. . System.out.println. . for console output. System.out. is an object that is part of the Java language. Program Logic and Indefinite . Loops. while. loops. Categories of loops. definite loop. : Executes a known number of times.. The . for. loops we have seen are definite loops. .. Print "hello" 10 times.. Dr. Kyung . Eun. Park. Summer . 2017 . Communicating with I/O Devices. Interactive Programming. Interactive program: . Reads input from . the console . Writes output to the console. Programming with a file. 1. Interactive programs. We have written programs that print console output, but it is also possible to read . input. from the console.. The user types input into the console. We capture the input and use it in our program..