수다닷컴

전에 새창을 띄우는 간단한거가 안된다고 질문했었는데요...
된다고들 하셔서 이상해서 New Project를 해서 새로운 클래스를 만들어서...
import javax.swing.*;

public class JFrameTest extends JFrame {

public JFrameTest() {
super(스윙 JFrame 테스트);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setSize(300, 200);
setVisible(true);}

public static void main(String args[]) {
JFrameTest jf = new JFrameTest();
}
}

이렇게 입력했더니 창이 뜹니다.
그런데... 이걸 그대로 기존 프로젝트의 실행파일로 옮겨도 실행이 안되네요... 아래와 같은 오류 메시지가 뜹니다...
뭐가 잘못된걸까요?...

Exception in thread main java.lang.NoClassDefFoundError: default (wrong name: Default)
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$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at sun.awt.FontConfiguration$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.awt.FontConfiguration.getFontCharset(Unknown Source)
at sun.awt.FontConfiguration.buildFontDescriptors(Unknown Source)
at sun.awt.FontConfiguration.getFontDescriptors(Unknown Source)
at sun.awt.FontConfiguration.getFontDescriptors(Unknown Source)
at sun.awt.PlatformFont.init(Unknown Source)
at sun.awt.windows.WFontPeer.init(Unknown Source)
at sun.awt.windows.WToolkit.getFontPeer(Unknown Source)
at java.awt.Font.getPeer_NoClientCode(Unknown Source)
at java.awt.Font.getPeer(Unknown Source)
at sun.awt.windows.WComponentPeer.setFont(Native Method)
at sun.awt.windows.WWindowPeer.initialize(Unknown Source)
at sun.awt.windows.WFramePeer.initialize(Unknown Source)
at sun.awt.windows.WComponentPeer.init(Unknown Source)
at sun.awt.windows.WCanvasPeer.init(Unknown Source)
at sun.awt.windows.WPanelPeer.init(Unknown Source)
at sun.awt.windows.WWindowPeer.init(Unknown Source)
at sun.awt.windows.WFramePeer.init(Unknown Source)
at sun.awt.windows.WToolkit.createFrame(Unknown Source)
at java.awt.Frame.addNotify(Unknown Source)
at java.awt.Window.show(Unknown Source)
at java.awt.Component.show(Unknown Source)
at java.awt.Component.setVisible(Unknown Source)
at BroadCastingServer.init(BroadCastingServer.java:65)
at BroadCastingServer.main(BroadCastingServer.java:103)

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