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[英]I am getting this error: Exception in thread “main” java.lang.NoClassDefFoundError: org/apache/commons/csv/CSVFormat
[英]Why am i getting this error? Exception in thread “main” java.lang.NoClassDefFoundError: "
這是完整的錯誤消息:
Exception in thread "main" java.lang.NoClassDefFoundError: DataEntry/java
Caused by: java.lang.ClassNotFoundException: DataEntry.java
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)
這是我的代碼:
import java.awt.*;
import java.awt.event.*;
public class DataEntry {
public static void main(String[] args) {
Frame frm=new Frame("DataEntry frame");
Label lbl = new Label("Please fill this blank:");
frm.add(lbl);
frm.setSize(350,200);
frm.setVisible(true);
frm.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
}
});
Panel p = new Panel();
Panel p1 = new Panel();
Label jFirstName = new Label("First Name");
TextField lFirstName = new TextField(20);
Label jLastName =new Label("Last Name");
TextField lLastName=new TextField(20);
p.setLayout(new GridLayout(3,1));
p.add(jFirstName);
p.add(lFirstName);
p.add(jLastName);
p.add(lLastName);
Button Submit=new Button("Submit");
p.add(Submit);
p1.add(p);
frm.add(p1,BorderLayout.NORTH);
}
}
該文件另存為DataEntry.java,並且DataEntry.class文件位於同一目錄中。 有人可以告訴我我做錯了嗎?
運行Java類時,不提供類的文件名,而是提供類名。 如果指定DataEntry.java
,則解釋器會認為您正在嘗試將類java
裝入包DataEntry
,這當然是不存在的。
代替這個:
java DataEntry.java
做這個:
java DataEntry
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