salesreporter.java

销售报告,可以输入多个数据,处理后给出多个数据,包括买卖的数据

import java.util.*;

/**
 Program to generate sales report.
*/
public class SalesReporter
{
    private double highest;
    private double average;
    private SalesAssociate[] record;//The array object is
                                    //created in getFigures.
    private int numberOfAssociates; //Same as record.length

    public void getFigures( )
    {
        Scanner keyboard = new Scanner(System.in);
        System.out.println("Enter number of sales associates:");
        numberOfAssociates = keyboard.nextInt( );
        record = new SalesAssociate[numberOfAssociates];
        int i;
        for (i = 0; i < numberOfAssociates; i++)
        {
            record[i] = new SalesAssociate( );
            System.out.println("Enter data for associate " + (i + 1));
            record[i].readInput( );
            System.out.println( );
        }
    }

    /**
     Computes the average and highest sales figures.
     Precondition: There is at least one salesAssociate.
    */
    public void update( )
    {
        int i;
        double nextSales = record[0].getSales( );
        highest = nextSales;
        double sum = nextSales;
        for (i = 1; i < numberOfAssociates; i++)
        {
             nextSales = record[i].getSales( );
             sum = sum + nextSales;
             if (nextSales > highest)
                highest = nextSales; //highest sales figure so far.
         }
        average = sum/numberOfAssociates;
    }

    /**
     Displays sales report on console screen.
    */
    public void displayResults( )
    {
        System.out.println("Average sales per associate is $" +
            average);
        System.out.println("The highest sales figure is $" + highest);
        System.out.println( );
        int i;
        System.out.println("The following had the highest sales:");
        for (i = 0; i < numberOfAssociates; i++)
        {
            double nextSales = record[i].getSales( );
            if (nextSales == highest)
            {
                record[i].writeOutput( );
                System.out.println("$" + (nextSales - average)
                                       + " above the average.");
                System.out.println( );
            }
        }
        System.out.println("The rest performed as follows:");
        for (i = 0; i < numberOfAssociates; i++)
        {
            double nextSales = record[i].getSales( );
            if (record[i].getSales( ) != highest)
            {
                record[i].writeOutput( );
                if (nextSales >= average)
                    System.out.println("$" + (nextSales - average)
                                           + " above the average.");
                else
                    System.out.println("$" + (average - nextSales)
                                           + " below the average.");
                System.out.println( );
            }
        }
    }

    public static void main(String[] args)
    {
        SalesReporter clerk = new SalesReporter( );
        clerk.getFigures( );
        clerk.update( );
        clerk.displayResults( );
    }
}