ftocstrategy.java

来自「著名的uncle Bob的Agile software development的」· Java 代码 · 共 55 行

import java.io.*;
public class ftocStrategy implements Application
{
  private InputStreamReader isr;
  private BufferedReader br;
  private boolean isDone = false;

  public static void main(String[] args) throws Exception
  {
    (new ApplicationRunner(new ftocStrategy())).run();
  }

  public void init()
  {
    isr = new InputStreamReader(System.in);
    br = new BufferedReader(isr);
  }

  public void idle()
  {
    String fahrString = readLineAndReturnNullIfError();
    if (fahrString == null || fahrString.length() == 0)
      isDone = true;
    else
    {
      double fahr = Double.parseDouble(fahrString);
      double celcius = 5.0/9.0*(fahr-32);
      System.out.println("F=" + fahr + ", C=" + celcius);
    }
  }

  public void cleanup()
  {
    System.out.println("ftoc exit");
  }

  public boolean done()
  {
    return isDone;
  }

  private String readLineAndReturnNullIfError()
  {
    String s;
    try
    {
      s = br.readLine();
    }
    catch(IOException e)
    {
      s = null;
    }
    return s;
  }
}