Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Transcribed Image Text:InputOutput Class: write a program that carries out the following
tasks:
o Create an object of type PrintWriter and that writes into a file
with the name greeting.txt.
o Print the message "Hello, world!" on the file.
o Close the file.
o Open the same file again.
o Read the message into a string variable (hint: use nextLine()
method to read the text).
o Print the message on the screen.
AddNumbers Class: write a program that asks the user to input
four floating-point numbers. Add all correctly specified values and
print the sum when the user is done entering data. Use exception
handling to detect improper inputs. For example, the user might
enter letters instead of numbers. In this case, use the exception
handling mechanism to print a proper message. (hint: use
InputMismatchException) Don't forget to import java.util.*.
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