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;
  }
}