Java编译器错误:“公共类型..必须在它自己的文件中定义"? [英] Java compiler error: "public type .. must be defined in its own file"?
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问题描述
我正在尝试编译这个:
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]);
}
}
}
我使用了 javac dns.java,但出现了一堆错误:
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)
我以前从未编译/做过 Java.我只需要这个来测试我的其他程序结果.有任何想法吗?我正在 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
并且你需要把:
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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