COMPROG MIDTERM

• EXCEPTION


  is an event that occurs during the executionof a program that disrupts the normal flow of instructions.
• EXCEPTION HANDLING


  ·is the process used to change the normal flow of code execution if a specified exception occurs.
• CHECKED EXCEPTIONS


  Exceptions that occur during compilation
• ClassNotFoundException


  The class is not found.
• IllegalAccessException


  Access to a class is denied.
• InstantiationException


  Attempt to create an object of an abstract class or an interface.
• NoSuchMethodException


  A requested method does not exist.
• UNCHECKED EXCEPTION


  exceptions that occur during execution
• ArithmeticException


  Arithmetic error, such as an integer divided by 0
• ArrayIndexOutOfBoundsException


  Accessing an invalid index of the array
• ArrayStoreException


  Assigning a value to an array index that does not match the expected data type
• InputMismatchException


  Entering a value that does not match the expected data

  type
• NullPointerException


  Invalid use of a null reference
• NumberFormatException


  Invalid conversion of a string to a numeric format
• StringIndexOutOfBoundsException


  Accessing an invalid index (character) of a string
• TRY BLOCK


  is a block of code that might throw an exception that can be handled by a matching catch block.
• CATCH BLOCK


  is a segment of code that can handle an exception that might be thrown by the try block that precedes it.
• getMessage()


  method can be used to determine Java's message about the exception.
• System.out.println(exceptionName.getMessage());


  syntax of using get message
• FINALLY BLOCK


  contains statements which are executed whether or not an exception is thrown.
• USER DEFINED EXCEPTION


  is created by extending the Exception class.
• THROW STATEMENT


  sends an exception out of a block or a method so it can be handled elsewhere.
• VOLATILE STORAGE


  it is the temporary storage
• NON-VOLATILE STORAGE


  it is the permanent storage
• COMPUTER FILE


  is a collection of data stored on a non-volatile device.
• TEXT FILE


  consists of data that can be read in a text editor.
• BINARY FILE


  contains data that is not encoded as text.
• MAIN DIRECTORY OR ROOT DIRECTORY


  Permanent files are commonly stored in where
• FOLDERS OR DIRECTORIES


  To organize stored files what is used
• Path CLASS


  creates objects that contain information about files and directories, such as sizes, locations, creation dates, and is used to check whether a file or directory exists.
• Files CLASS


  performs operations on files and directories, such as determining their attributes, creating input and output streams, and deleting them.
• import java.nio.file.*;


  to use both PAth and Files class what statement would be followed
• Path filePath = Paths.get("C:\\Java\\Chapter8\\sample.txt");


  Syntax to create and define a Path
• ABSOLUTE PATH


  is a complete path; it does not require any other information to locate a file on a system.
• RELATIVE PATH


  depends on other path information.
• String toString()


  Returns the String representation of the Path, eliminating double backslashes
• Path getFileName()


  Returns the file or directory denoted by this Path; this is the last item in the sequence of name elements.
• int getNameCount()


  Returns the number of name elements in the Path
• Path getName(int)


  Returns the name in the position of the Path specified by the integer parameter
• toAbsolutePath()


  What method is used to convert the relative path to an absolute path