java - 一个简单的网络程序中的noclassdeffounderror。我正在使用Eclipse IDE运行Java程序

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

class IpAddr {
    public static void main(String arg[]) {
        System.out.println("Hello Jagadeesh...>!!");
        try {
            InetAddress ia=InetAddress.getByName("www.facebook.com");
            System.out.println(ia);
        }
        catch(UnknownHostException uhe) {
            System.out.println("ip address of facebook is not found. :(");
        }
    }
}

在控制台中：运行时
    E：\ myworkspace \ network_practice \ src \ stage1> javac IpAddr.java
    E：\ myworkspace \ network_practice \ src \ stage1> java IpAddr

Exception in thread "main" java.lang.NoClassDefFoundError: IpAddr（错误名称：s
    tage1 / IpAddr）

at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)

E:\myworkspace\network_practice\src\stage1>cd..

最佳答案

您没有在您的类中声明一个包，所以它转到默认包。但是您有stage1文件夹。