"AWT-EventQueue-0"스레드의 예외 - 컴파일 할 수없는 소스 코드?

Question

나는 몇 가지 튜토리얼에서 발견되는 두 가지 간단한 수업을 :

package skeleton; 

import java.awt.EventQueue; 
import javax.swing.JFrame; 

public class Skeleton extends JFrame 
{ 

    public Skeleton() 
    { 
     add(new Board()); 

     setTitle("Star"); 
     pack(); 
     setResizable(false); 
     setLocationRelativeTo(null);   
     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    } 

    public static void main(String[] args) 
    { 
     EventQueue.invokeLater(new Runnable() {    
      @Override 
      public void run() { 
       JFrame ex = new Skeleton(); 
       ex.setVisible(true);    
      } 
     }); 
    } 

} // End Skeleton 

및

package Skeleton; 

import java.awt.Color; 
import java.awt.Dimension; 
import java.awt.Graphics; 
import java.awt.Graphics2D; 
import java.awt.Image; 

import java.awt.Toolkit; 
import java.awt.event.ActionEvent; 

import java.awt.event.ActionListener; 

import javax.swing.ImageIcon; 
import javax.swing.JPanel; 
import javax.swing.Timer; 

public class Board extends JPanel 
    implements ActionListener { 

    private final int B_WIDTH = 350; 
    private final int B_HEIGHT = 350; 
    private final int INITIAL_X = -40; 
    private final int INITIAL_Y = -40; 
    private final int DELAY = 25; 

    private Image star; 
    private Timer timer; 
    private int x, y; 

    public Board() { 

     loadImage(); 
     initBoard();   
    } 

    private void loadImage() { 

     ImageIcon ii = new ImageIcon("star.png"); 
     star = ii.getImage();   
    } 

    private void initBoard() { 

     setBackground(Color.BLACK); 
     setPreferredSize(new Dimension(B_WIDTH, B_HEIGHT)); 

     setDoubleBuffered(true); 

     x = INITIAL_X; 
     y = INITIAL_Y; 

     timer = new Timer(DELAY, this); 
     timer.start(); 
    } 

    @Override 
    public void paintComponent(Graphics g) { 
     super.paintComponent(g); 

     drawStar(g); 
    } 

    private void drawStar(Graphics g) { 

     Graphics2D g2d = (Graphics2D) g; 
     g2d.drawImage(star, x, y, this); 
     Toolkit.getDefaultToolkit().sync(); 
     g.dispose();   
    } 

    @Override 
    public void actionPerformed(ActionEvent e) { 

     x += 1; 
     y += 1; 

     if (y > B_HEIGHT) { 

      y = INITIAL_Y; 
      x = INITIAL_X; 
     } 

     repaint(); 
    } 
} 

이

은 뭔가를 애니메이션으로되어 있지만, 코드를 컴파일하는 것은 나에게 오류 준다 :

run: 
Exception in thread "AWT-EventQueue-0" java.lang.RuntimeException: Uncompilable source code - Erroneous tree type: <any> 
    at skeleton.Skeleton.<init>(Skeleton.java:11) 
    at skeleton.Skeleton$1.run(Skeleton.java:25) 
    at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251) 
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:705) 
    at java.awt.EventQueue.access$000(EventQueue.java:101) 
    at java.awt.EventQueue$3.run(EventQueue.java:666) 
    at java.awt.EventQueue$3.run(EventQueue.java:664) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76) 
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:675) 
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:211) 
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128) 
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117) 
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113) 
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105) 
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:90) 
BUILD SUCCESSFUL (total time: 1 second) 

을

무엇이 잘못 되었나요? 성공적으로 작성된 빌드가 있지만 아무 일도 일어나지 않습니다.

Answer 1

각 클래스의 맨 처음 줄에 오류가 있는지 확인하십시오. 한 클래스는 "해골"패키지에 있고, 다른 클래스는 "해골"에 있습니다. 대소 문자를 구분합니다.