本文介绍了Java编译器错误：“public type ..必须在其自己的文件中定义”？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我试图编译这个：
public class DNSLookUp {
public static void main(String[] args) {
InetAddress hostAddress;
try {
hostAddress = InetAddress.getByName(args[0]);
System.out.println (hostAddress.getHostAddress());
}
catch (UnknownHostException uhe) {
System.err.println("Unknown host: " + args[0]);
}
}
}
我使用javac dns.java ，但我遇到了一些错误：
I used javac dns.java, but I am getting a mess of errors:
dns.java:1: error: The public type DNSLookUp must be defined in its own file
public class DNSLookUp {
^^^^^^^^^
dns.java:3: error: InetAddress cannot be resolved to a type
InetAddress hostAddress;
^^^^^^^^^^^
dns.java:6: error: InetAddress cannot be resolved
hostAddress = InetAddress.getByName(args[0]);
^^^^^^^^^^^
dns.java:9: error: UnknownHostException cannot be resolved to a type
catch (UnknownHostException uhe) {
^^^^^^^^^^^^^^^^^^^^
4 problems (4 errors)
我从来没有编译/做过Java。我只需要这个测试我的其他程序的结果。有任何想法吗？我在Linux机器上编译。
I have never compiled/done Java before. I only need this to test my other programs results. Any ideas? I am compiling on a Linux machine.
推荐答案
文件需要调用 DNSLookUp.java to put：
The file needs to be called DNSLookUp.java and you need to put:
import java.net.InetAddress;
import java.net.UnknownHostException;
在文件顶部
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