COMP 202 Lecture Notes - Lecture 21: Cheat Sheet, Exception Handling, Compile Time

• School: McGill University
• Department: Computer Science (Sci)
• Course: COMP 202
• Professor: Daniel Kirshbaum

Document Summary

Comp202 lecture 21 - checked vs unchecekd exceptions and file i/o. A try/catch block allows us to try some code, and if an exception is raised, we can then. An exception that is caught will notcause the program to crash. Unchecked (what we"ve seen up until now); Unchecked: not checked at compile- time. They cause your code to crash at run- time. You are not forced to handle these exceptions. It is up to the programmer to decide if to catch the excptions. Checked: checked at compile time. There are two ways to handle these exceptions: These kind of operations are called file input/output (file i/o). The import statement: import java. io. Writing to a file: (useful to put on a crib sheet for the final as this doesn"t change) Filewriter fw = new filewriter( file. txt ); name of file. Bufferedwriter bw = new bufferedwriter(fw); bufferedwriter takes as input the filewriter. Strting message = hello!\n ; bw. write(message); bw. close(); fw. close();