EXCEPTION HANDLING AND TEXT I/O - Introduction to Java Programming: Comprehensive Version - page 490

F IGURE 12.13

The program displays the number of characters, words, and lines in the given

file.

*12.14

( Process scores in a text file ) Suppose that a text file contains an unspecified
number of scores separated by blanks. Write a program that prompts the user
to enter the file, reads the scores from the file, and displays their total and
average.

*12.15

( Write/read data ) Write a program to create a file named Exercise12_15.txt if
it does not exist. Write 100 integers created randomly into the file using text
I/O. Integers are separated by spaces in the file. Read the data back from the
file and display the data in increasing order.

**12.16

( Replace text ) Listing 12.16, ReplaceText.java, gives a program that replaces
text in a source file and saves the change into a new file. Revise the program to
save the change into the original file. For example, invoking

java Exercise12_16 file oldString newString

replaces oldString in the source file with newString .

***12.17

( Game: hangman ) Rewrite Programming Exercise 7.35. The program reads the
words stored in a text file named hangman.txt . Words are delimited by spaces.

**12.18

( Add package statement ) Suppose you have Java source files under the direc-
tories chapter1 , chapter2 , . . . , chapter34 . Write a program to insert the
statement package chapteri; as the first line for each Java source file under
the directory chapteri . Suppose chapter1 , chapter2 , . . . , chapter34
are under the root directory srcRootDirectory . The root directory and
chapteri directory may contain other folders and files. Use the following
command to run the program:

java Exercise12_18 srcRootDirectory

*12.19

( Count words ) Write a program that counts the number of words in President
Abraham Lincoln's Gettysburg address from http://cs.armstrong.edu/liang/data/
Lincoln.txt .

**12.20

( Remove package statement ) Suppose you have Java source files under the
directories chapter1 , chapter2 , . . . , chapter34 . Write a program to
remove the statement package chapteri; in the first line for each Java
source file under the directory chapteri . Suppose chapter1 , chapter2 ,
. . . , chapter34 are under the root directory srcRootDirectory . The root
directory and chapteri directory may contain other folders and files. Use
the following command to run the program:

java Exercise12_20 srcRootDirectory

*12.21

( Data sorted? ) Write a program that reads the strings from file SortedStrings.
txt and reports whether the strings in the files are stored in increasing order.