largetemperaturetable.java

来自「Java经典例程 从外国一大学计算机教授出版物下载的代码 经典」· Java 代码 · 共 59 行

class LargeTemperatureTable {

  /* Large Temperature Table Program    by JM Bishop Sept 1996
   * -------------------------------    Java 1.1
   *                                    updated April 2000
   * Produces a conversion table from Celsius to Fahrenheit
   * for values from 0 to 99.
   *
   * Illustrates for-loops, methods for structuring,
   * typed methods and parameters.
   */

  int colsPerLine = 5;
  int maxLineNo = 20;
  String gap = "\t\t";

  LargeTemperatureTable () {

    // First print the headings
    System.out.println("\t\tTemperature Conversion Table");
    System.out.println("\t\t============================");
    System.out.println();

    for (int col = 0; col < colsPerLine; col++)
      System.out.print("C  F" + gap);
    System.out.println();

    // Seconnd, print the table:
    // For each of the lines required, the outaLine
    // method is called with the line number as a parameter
    for (int r = 0; r < maxLineNo; r++)
      outaLine(r);
  }

  void outaLine(int thisline) {
    /* Using the information given by the parameter as
     * to which line this is, the method calculates the
     * celsius values for that line and displays them with
     * their Fahrenheit equivalents
     */

    for (int col = 0; col < colsPerLine; col++) {
      int c = thisline * colsPerLine + col;
      System.out.print(c + "  ");
      System.out.print(fahrenheit(c) + gap);
    }
    System.out.println();
  }

  // a simple conversion function
  long fahrenheit(int celsius) {
    return Math.round(celsius*9.0/5 + 32);
  }

  public static void main(String[] args) {
    new LargeTemperatureTable () ;
  }
}