Warum ist diese Aktion nicht abstrakt?

Question

Es fällt mir schwer zu verstehen, warum eine der Aktionen in einer Klasse abstrakt ist und die Aktion in der anderen Klasse nicht.

Quellcode 1: (Fehler beim Kompilieren: https://gyazo.com/cd3c21a8562589451814903febaf89fe)

import java.awt.*; 
import java.awt.event.*; 
import javax.swing.*; 

public class Play extends JFrame{ 

Engine drawPanel = new Engine(); 
private int x = 0; 
private int y = 0; 

public int getX(){ 
    return x; 
} 
public int getY(){ 
    return y; 
} 

public Play(){ 
    Action rightAction = new AbstractAction(){ 
     public void actionPreformed(ActionEvent e){ 
      x+=10; 
      drawPanel.repaint(); 
     } 
    }; 
    Action leftAction = new AbstractAction(){ 
     public void actionPreformed(ActionEvent e){ 
      x-=10; 
      drawPanel.repaint(); 
     } 
    }; 

     InputMap inputMap = drawPanel.getInputMap(JPanel.WHEN_IN_FOCUSED_WINDOW); 
     ActionMap actionMap = drawPanel.getActionMap(); 

    inputMap.put(KeyStroke.getKeyStroke("RIGHT"), "rightAction"); 
    actionMap.put("rightAction", rightAction); 
    inputMap.put(KeyStroke.getKeyStroke("LEFT"), "leftAction"); 
    actionMap.put("leftAction", leftAction); 

    add(drawPanel); 
    pack(); 
    setDefaultCloseOperation(EXIT_ON_CLOSE); 
    setSize(640, 480); 
    setTitle("Game"); 
    setLocationRelativeTo(null); 
    setVisible(true); 
} 

public static void main(String[] args){ 

    EventQueue.invokeLater(new Runnable(){ 
     @Override 
     public void run(){ 
      new Play(); 
     } 
    }); 
} 
} 

Quellcode 2: (Der Code, der gerade fein kompiliert)

import java.awt.*; 
import java.awt.event.*; 
import javax.swing.*; 

public class KeyBidings extends JFrame { 
int x = 0; 
int y = 0; 

DrawPanel drawPanel = new DrawPanel(); 

public KeyBidings(){ 
    Action rightAction = new AbstractAction(){ 
     public void actionPerformed(ActionEvent e) { 
      x +=10; 
      drawPanel.repaint(); 
     } 
    }; 

     InputMap inputMap = drawPanel.getInputMap(JPanel.WHEN_IN_FOCUSED_WINDOW); 
     ActionMap actionMap = drawPanel.getActionMap(); 

    inputMap.put(KeyStroke.getKeyStroke("RIGHT"), "rightAction"); 
    actionMap.put("rightAction", rightAction); 

    add(drawPanel); 

    pack(); 
    setDefaultCloseOperation(EXIT_ON_CLOSE); 
    setLocationRelativeTo(null); 
    setVisible(true); 
} 

private class DrawPanel extends JPanel { 


    protected void paintComponent(Graphics g) { 
     super.paintComponent(g); 
     g.setColor(Color.GRAY); 
       g.fillRect(0, 0, getWidth(), getHeight()); 
     g.setColor(Color.GREEN); 
     g.fillRect(x, y, 50, 50); 
    } 

    public Dimension getPreferredSize() { 
     return new Dimension(400, 200); 
    } 
} 

public static void main(String[] args) { 
    EventQueue.invokeLater(new Runnable(){ 
     public void run(){ 
      new KeyBidings(); 
     } 
    }); 
} 
} 

Answer 1

Da im ersten Beispiel Sie einen Tipp haben Fehler:

actionPreformed 

eher

sein sollte

actionPerformed