console.java

Java程序设计技巧与开发实例附书源代码。

import java.io.*;

public class Console
{
   /**读入一个double型的数
    * @return double
    */
   public static double readDouble()
   {
      try
      {
         return Double.valueOf(readString().trim()).doubleValue();
      }
      catch (NumberFormatException ne)
      {
         System.err.println("Console.readDouble: Not a double...");
         System.exit( -1);
         return 0.0;
      }
   }

   /**读入一个整数
    * @return int
    */
   public static int readInt()
   {
      try
      {
         return Integer.valueOf(readString().trim()).intValue();
      }
      catch (NumberFormatException ne)
      {
         System.err.println("Console.readInt: Not an integer...");
         System.exit( -1);
         return -1;
      }
   }

   /** 读入一个字符串
    * @return String
    */
   public static String readString()
   {
      String string = new String();
      BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
      try
      {
         string = in.readLine();
      }
      catch (IOException e)
      {
         System.out.println("Console.readString: Unknown error...");
         System.exit( -1);
      }
      return string;
   }
}