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;
    }
}