import javax.swing.JOptionpane;public class Welcome {
public static void main ( String arge[] )
{
JOptionpane.showmessagedialog(null,"welcome");
System.exit(0);
}
}运行结果E:\>javac welcome.java
welcome.java:3: class Welcome is public, should be declared in a file named Welc
ome.java
public class Welcome {
^
welcome.java:1: cannot resolve symbol
symbol : class JOptionpane
location: package swing
import javax.swing.JOptionpane;
^
welcome.java:6: cannot resolve symbol
symbol : variable JOptionpane
location: class Welcome
JOptionpane.showmessagedialog(null,"welcome");
^
3 errorsE:\>
public static void main ( String arge[] )
{
JOptionpane.showmessagedialog(null,"welcome");
System.exit(0);
}
}运行结果E:\>javac welcome.java
welcome.java:3: class Welcome is public, should be declared in a file named Welc
ome.java
public class Welcome {
^
welcome.java:1: cannot resolve symbol
symbol : class JOptionpane
location: package swing
import javax.swing.JOptionpane;
^
welcome.java:6: cannot resolve symbol
symbol : variable JOptionpane
location: class Welcome
JOptionpane.showmessagedialog(null,"welcome");
^
3 errorsE:\>
楼主写成了welcome.java
w是大写才对!
import javax.swing.JOptionPane;
public static void main ( String arge[] )
{
JOptionPane.showMessageDialog(null,"Welcome");
System.exit(0);
}
}
Exception in thread "main" java.lang.NoClassDefFoundError: Welcome/javaE:\>
没有.java