INTRODUCTION TO OBJECTS AND INPUT/OUTPUT - Java Programming: From Problem Analysis to Program Design - page 171

23. Suppose that infile is a Scanner object associated with the file that
contains the following data: 27306 savings 7503.35 . Write the Java
statements that read and store the first input in the int variable acctNum-
ber , the second input in the String variable accountType , and the third
input in the double variable balance .
24. Suppose that you have the following statements:
PrintWriter outfile;
double distance = 375;
double speed = 58;
double travelTime;
Write Java statements to do the following:
a. Open the file travel.dat using the variable outfile .
b. Write the values of the variables distance and speed , to two decimal
places, in the file travel.dat .
c. Calculate and write the travelTime , to two decimal places, in the file
travel.dat .
25. A program reads data from a file called inputFile.dat and, after doing
some calculations, writes the results to a file called outFile.dat . Answer
the following questions:

3

a. After

the program executes, what are the contents of the file

inputFile.dat ?
b. After the program executes, what are the contents of the file
outFile.dat if this file was empty before the program executed?
c. After the program executes, what are the contents of the file outFile.dat
if this file contained 100 numbers before the program executed?
d. What would happen if the file outFile.dat did not exist before the
program executed?

PROGRAMMING EXERCISES

1. Consider the following incomplete Java program:
public class Ch3_PrExercise1
{

public static void main(String[] args)
{

.
.
.

}

}