Chapter 9.2
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This document discusses multiple catch blocks and the finally block in Java exception handling. It explains that a try-catch statement can have multiple catch blocks to handle different exception types, with only the matching catch block executing. The catch blocks should be ordered from most specific to most general exception types. The finally block allows executing code regardless of whether an exception occurred or not.
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Here are solutions to the exercises:
1. WAP to enter a name of the user and show an exception if it does not enter its name:
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
try {
System.out.print("Enter your name: ");
String name = sc.nextLine();
if(name.isEmpty()) {
throw new Exception("Name cannot be empty");
}
System.out.println("Name entered: " + name);
} catch (Exception e) {
System.out.println("Exception: " + e.getMessage
UNIT 2.pptx
The document discusses various aspects of exception handling in Java such as the different types of exceptions (checked, unchecked, errors), keywords used in exception handling (try, catch, finally, throw, throws), and common scenarios where exceptions may occur. It provides examples of using try-catch blocks to handle exceptions, throwing custom exceptions using throw, and declaring exceptions in method signatures using throws. Finally, it discusses some key differences between concepts like final, finally and finalize in Java.
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Exceptions provide a flexible error handling mechanism in Java. The try-catch block is used to catch and handle exceptions. Exceptions can be thrown using the throw keyword. Best practices include providing clear exception messages, only throwing exceptions for unexpected errors, and catching specific exceptions rather than all exceptions. Custom exceptions can also be created by inheriting from the Exception class.
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This document discusses file input and output in Java, including using File objects to get file information, including JFileChooser to let users select files, and using various I/O streams like FileOutputStream, FileInputStream, DataOutputStream, DataInputStream, FileWriter, PrintWriter, FileReader, BufferedReader and Scanner to write and read text and binary data to and from files. The learning goals are to use File objects, include JFileChooser, write and read bytes and primitive data types to files using different output and input streams, and read text files.
Chapter 9.3
A method can propagate an exception back to its caller by including the thrown exception type in its method header. When a method directly throws an exception using the throw keyword, it is the origin of the exception. A method that may throw an exception either directly or indirectly is called an exception thrower, which can be either a catcher that includes a catch block or a propagator that does not contain a catch block.
Chapter 9.4
This document discusses different types of exceptions in Java - checked exceptions which must be handled at compile time, and unchecked exceptions which are not required to be handled. It explains that checked exceptions include subclasses of Exception, while unchecked exceptions include subclasses of RuntimeException and Error. The document also outlines different rules for handling checked exceptions versus unchecked exceptions in methods.
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The document discusses inheritance in Java. It defines inheritance as creating a subclass from a superclass, where the subclass inherits properties like methods and attributes from the superclass. It provides examples of single inheritance with a Circle subclass inheriting from a Shape superclass. The document also covers when inheritance is used, types of inheritance in Java, superclass and subclass characteristics, and provides code examples of a Rectangle superclass and Box subclass, where Box inherits from Rectangle and overrides some methods.
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This document discusses exception handling in programming. It covers catching exceptions with try-catch blocks, throwing and propagating exceptions with multiple catch blocks, and distinguishing between checked and unchecked exceptions. The learning goals are to make code more reliable using exception handling, implement try-catch blocks to catch and handle exceptions, write methods that propagate exceptions, and distinguish checked and unchecked exceptions.
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Chapter 9.2
- 1. THROWING EXCEPTION AND MULTIPLE CATCH BLOCK Chapter 9.2:
- 2. Multiple catch Blocks A single try-catch statement can include multiple catch blocks, one for each type of exception. try { . . . age = Integer.parseInt(inputStr); . . . val = cal.get(id); . . . } catch (NumberFormatException e){ . . . } catch (ArrayIndexOutOfBoundsException e){ . . . }
- 3. Multiple catch Control Flow Only one catch{} block gets control (the first block that matches the type of the exception ). If no catch{} block matches the exception, none is picked (just as if there were no try{} block.)
- 4. Multiple catch Control Flow The most specific exception types should appear first in the structure, followed by the more general exception types. A child class should appear before any of its ancestors. If class A is not an ancestor or descendant of class B, then it doesn't matter which appears first. Eg. the following is wrong: try { ... } catch (Exception ex ) { . . . } catch (ArithmeticException ex ) { . . . }
- 5. Multiple catch Control Flow Question: Is this ok?: try { ... } catch (NumberFormatException ex ) { . . . } catch (ArithmeticException ex ) { . . . }
- 6. The finally Block There are situations where we need to take certain actions regardless of whether an exception is thrown or not. We place statements that must be executed regardless of exceptions in the finally block. try { // statements, some of which might // throw an exception } catch ( SomeExceptionType ex ) { // statements to handle this // type of exception } catch ( AnotherExceptionType ex ) { // statements to handle this // type of exception } finally { // statements which will execute no matter // how the try block was exited. }