File I/O - Absolute Java - page 643

43. Yes. That is why it is a legitimate argument for writeObject .
44. No. Each time the program is run, the file will get longer.
45. Add the following near the start of main :
ioStream.setLength(0);

Programming Projects
Visit www.myprogramminglab.com to complete select exercises online and get instant
feedback.
PROJECTS INVOLVING ONLY TEXT FILES
1. The text files boynames.txt and girlnames.txt , which are included in the
source code for this topic text, contain a list of the 1,000 most popular boy and
girl names in the United States for the year 2003 as compiled by the Social Security
Administration.
These are blank-delimited files, where the most popular name is listed first, the
second most popular name is listed second, and so on, to the 1,000 th most popular
name, which is listed last. Each line consists of the first name followed by a blank
space and then the number of registered births using that name in the year. For
example, the girlnames.txt file begins with
Emily 25494
Emma 22532
Madison 19986
This indicates that Emily was the most popular name with 25,494 registered
namings, Emma was the second most popular with 22,532, and Madison was the
third most popular with 19,986.

VideoNote

Solution to
Programming
Project 10.1

Write a program that reads both the girl and boy files into memory using arrays.
Then, allow the user to input a name. The program should search through both
arrays. If there is a match, then it should output the popularity ranking and the
number of namings. The program should also indicate if there is no match.

For example, if the user enters the name “Justice,” then the program should output

Justice is ranked 456 in popularity among girls with 655 namings.
Justice is ranked 401 in popularity among boys with 653 namings.

If the user enters the name “Walter,” then the program should output

Walter is not ranked among the top 1000 girl names.
Walter is ranked 356 in popularity among boys with 775 namings.
2. Write a program that will search a text file of strings representing numbers of type
int and will write the largest and the smallest numbers to the screen. The file
contains nothing but strings representing numbers of type int , one per line.
3. Write a program that takes its input from a text file of strings representing numbers
of type double and outputs the average of the numbers in the file to the screen. The
file contains nothing but strings representing numbers of type double , one per line.