j_inetaddress.java

一个十分好的java基础学习的课件

// ////////////////////////////////////////////////////////
// 
// J_InetAddress.java
// 
// Created by Jun-Hai Yong,    on XX xx, xxxx (Date)
// ////////////////////////////////////////////////////////
// Readme:
//      Demonstrating the function of the InetAddress class.
// ////////////////////////////////////////////////////////
// Using this example, please explicitly refer to the book:
//     Jun-Hai Yong. Programming in Java. 
//     Beijing: Tsinghua University Press, 2004.
// 使用本例子，请注明引用:
//     雍俊海. Java 程序设计. 北京: 清华大学出版社, 2004.
// Please note that the author and publisher make no 
// warranty of any kind on the examples provided.
// ////////////////////////////////////////////////////////

import java.net.InetAddress;
import java.net.UnknownHostException;

public class J_InetAddress
{

    public static void main(String args[])
    {
        String s = "www.tsinghua.edu.cn";
        InetAddress ts= null;

        try
        { 
            ts = InetAddress.getByName(s);
        }
        catch (UnknownHostException e)
        { 
            System.err.println(e);
        }
        if (ts!=null)
        {
            System.out.println("The IP address of Tsinghua is "
                + ts.getHostAddress( ));
            System.out.println("The host name of Tsinghua is "
                + ts.getHostName( ));
        }
        else System.out.println("Cannot access " + s);
    } // End of method: main

} // End of class: J_InetAddress