salesfigures.java

Java程序设计技巧与开发实例附书源代码。

public class SalesFigures {
   static String MONTHS[] = {
       "Feb", "Apr", "Jun", "Aug", "Oct", "Dec"};

   public static int[][] generateTable(int salesFigures[]) {
      int table[][] = new int[MONTHS.length][];
      for (int row = 0; row < salesFigures.length; row++) {
         table[row] = new int[row + 1];
      }
      for (int row = 0; row < table.length; row++) {
         for (int col = 0; col < table[row].length; col++) {
            table[row][col] = salesFigures[col];
         }
      }
      return table;
   }

   public static int[][] computeSummary(int table[][]) {
      int summary[][] = new int[MONTHS.length][2];
      for (int row = 0; row < table.length; row++) {
         summary[row][0] = 0;
         for (int col = 0; col < table[row].length; col++) {
            summary[row][0] += table[row][col];
         }
         summary[row][1] = summary[row][0] / table[row].length;
      }
      return summary;
   }

   public static void showReport(int table[][], int summary[][]) {
      System.out.print("   \t| Sum\tAverage\t| ");
      for (int i = 0; i < MONTHS.length; i++) {
         System.out.print(MONTHS[i] + "\t");
      }
      System.out.println();
      for (int row = 0; row < table.length; row++) {
         System.out.print(MONTHS[row] + "\t| ");
         System.out.print(summary[row][0] + "\t" + summary[row][1] + "\t| ");
         for (int col = 0; col < table[row].length; col++) {
            System.out.print(table[row][col] + "\t");
         }
         System.out.println();
      }
   }

   public static void main(String args[]) {
      int salesFigures[] = new int[MONTHS.length];
      for (int i = 0; i < salesFigures.length; i++) {
         salesFigures[i] = (int) (100 * Math.random());
      }
      int table[][] = generateTable(salesFigures);
      int summary[][] = computeSummary(table);
      showReport(table, summary);
   }
}