这是一个来自教科书的简单Java程序
import javax.swing.JOptionPane;
public class WelcomeInMessageDialogBox{
public static void main(String[] args){
// Display Welcome
JOptionPane.showMessageDialog(null,"Welcome to Java!");
}
}
我将WelcomeInMessageDialogBox.java放在桌面上,然后在终端上输入
javac WelcomeInMessageDialogBox.java
java WelcomeInMessageDialogBox
然后它返回
Exception in thread "main" java.lang.NoClassDefFoundError: WelcomeInMessageDialogBox
Caused by: java.lang.ClassNotFoundException: WelcomeInMessageDialogBox
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
发生了什么?我对Hello World.java没有任何问题,可以在Mac终端上运行Dialog Box java程序吗?