PPT-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 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.. What happens when a program has a run-time error?. In most cases, the program terminates abnormally, possibly displaying a cryptic message to the user (or no message at all). in . unix. , such errors often place “core” dumps in your directory. 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. 2. Motivations. When a program runs into a runtime error, the program terminates abnormally. How can you handle the runtime error so that the program can continue to run or terminate gracefully? This is the subject we will introduce in this chapter.. 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.. CS1: Java Programming. Colorado State University. Original slides by Daniel Liang. Modified slides by Chris Wilcox. 2. Motivations. When a program runs into a runtime error, the program terminates abnormally. How can you handle the runtime error so that the program can continue to run or terminate gracefully? This is the subject we will introduce in this chapter.. Phil Tayco. San Jose City College. Slide version 1.1. Updated Nov. 5, 2018. Error Handling. Consider the following. There are at least 2 potential run-time errors that can occur here:. public static . 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.. 1. Lecture Content. What are Exceptions?. Handling Exceptions. The . System.Exception. Class. Exceptions Hierarchy. Throwing Exceptions. Best Practices. 2. 1. . What are Exceptions. 3. . The . exce. CHAPTER 5 EXCEPTION HANDLING PL/SQL block has the following structure: DECLARE Declaration statements BEGIN Executable statements EXCEPTION Exception-handling statements END ; PL/SQL BLOCK STRUCTURE 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 Damian Gordon. Exception Handling. When an error occurs in a program that causes the program to crash, we call that an “. exception. ” (since something exceptional has occurred).. We say that “. Errors can be broadly categorized into two types. We will discuss them one by one.. 1.Compile Time Errors. 2.Run Time Errors. Compile Time Errors . – Errors caught during compiled time is called Compile time errors. Compile time errors include library reference, syntax error or incorrect class import.. VB.NET has an inbuilt class that deals with errors. The Class is called Exception. . When an exception error is found, an Exception object is created. The coding structure VB.NET uses to deal with such Exceptions is called the .