📄 addr.java
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import java.net.*;
import java.io.*;
class Addr{
public static void main(String[] args){
String a = "210.31.43.106";
try{
InetAddress myAddr = new InetAddress();
myAddr = InetAddress.getByName(a);
System.out.println(myAddr.getCanonicalHostName());
System.out.println("主机地址为:"+myAddr.getHostAddress());
System.out.println("主机名为:"+myAddr.getHostName());
System.out.println("是否loopback地址?"+myAddr.isLoopbackAddress());
}catch(UnknownHostException e){System.out.println("Error"+e.getMessage());}
}
}
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