InetAddress类中的getAddress()方法的返回值为什么直接是null？

Question

正在学习java的socket编程。在看源码时候发现，InetAddress类中的getAddress()方法的返回值为null；
表示很蒙圈，望大神能解答

Answer 1

public static void main(String[] args) throws UnknownHostException {
InetAddress address = InetAddress.getLocalHost();
System.out.println("this is address:" + address);

    String hostName = address.getHostName();
    String hostAddress = address.getHostAddress();
    System.out.println("this is host name:" + hostName);
    System.out.println("this is host address:" + hostAddress);

    byte[] address4Byte = address.getAddress();
    System.out.println("this is address4Byte len:" + address4Byte.length);
    for (int i = 0; i < address4Byte.length; i++) {
        System.out.print(address4Byte[i]);
    }
}

这是楼主写的测试方法。我用byte[] address4Byte指向了address.getAddress();这个方法，但是address.getAddress();返回值是null；
但还是能获取到我的主机地址，这是为什么呢？