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Quellcode

public class Test {
    public static int width = 400, height = 500;
            
    
            public static void main(String[] args){
                JFrame jframe = new JFrame("Zeichnen");
                jframe.setSize(width, height);
                jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                jframe.setLocationRelativeTo(null);
                jframe.setVisible(true);
                
            }
            public void paintComponent(Graphics g){
                g.fillRect(10, 10, width, height);
            }
    }

Quellcode

public class Test extends JPanel{
public static void main(String[] args){
JFrame jframe = new JFrame("Mein frame");
jframe.setSize(100, 100);
jframe.add(new Konsole());
jframe.setVisible(true);
}
public void paintComponent(Graphics g){
g.fillRect(10, 10, 10, 10);
}
}

Quellcode

public class Test  {
    public static void main(String[] args){
        JFrame jframe = new JFrame("Beispiel");
        jframe.setSize(300, 300);
        jframe.add(new any());
        jframe.setVisible(true);
    }
    class any extends JPanel{
        public void paintComponent(Graphics g){
            g.fillRect(10, 10, 10, 10);
        }
    }
    }

Quellcode

public class Test implements ActionListener{
    public static int x = 0;
    
    
    public static void main(String[] args){
        new Test(); 
    }
    public Test(){
        
        JFrame jframe = new JFrame();
        jframe.setSize(300, 300);
        jframe.add(new any());
        jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        jframe.setVisible(true);
        
        Timer t = new Timer(100, this);
        t.start();
        
    }
    @Override
    public void actionPerformed(ActionEvent e){
        x = +5;
    }
        
    static class any extends JPanel {
        public void paintComponent(Graphics g){
            g.fillRect(x, 10, 10, 10);
        }

        
    }
}