Programming and Problem Solving with Java

CASE STUDY

250

importjava.io.*; // File types

public classIncomes

{

public static voidmain(String[] args) throwsIOException

{

Gender female; // Females

Gender male; // Males

String inLine; // A line from the file

chargenderCode; // Indicates gender

doublesalary; // Salary amount

BufferedReader inFile; // Input data file

PrintWriter outFile; // Output data file

// Prepare files for reading and writing

inFile = newBufferedReader(newFileReader("gender.dat"));

outFile = newPrintWriter(newFileWriter("results.dat"));

// Initialize process

female = newGender();

male = newGender();

while((inLine = inFile.readLine()) != null)

{

// Update process

// Extract gender code and amount from input line

// Gender is the first character

genderCode = inLine.charAt( 0 );

// Amount begins in the second position

salary = Double.parseDouble(inLine.substring( 1 , inLine.length()));

// Process amount based on gender code

if(genderCode == 'F')

// Female

female.update(salary);

else

// Male

male.update(salary);

}

inFile.close(); // Done reading

// Write results

outFile.println("For "+ female.knowCount() + " females, the average income is "

+ female.knowAverage() + ".");

outFile.println("For "+ male.knowCount() + " males, the average income is "+

male.knowAverage() + ".");

outFile.close();

}

}

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