Рассматривал пример по смещению фигуры
| Код |
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class NewEmpty3
{
public static void main(String [] args)
{
My f=new My();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.show();
}
}
class My extends JFrame
{
private int x1 = 50;
public My()
{
setTitle("123");
setSize(500,500);
MyPanel panel = new MyPanel();
Container pane = getContentPane();
pane.add(panel);
JToolBar bar = new JToolBar();
JButton b1 = new JButton ("<=");
bar.add(b1);
b1.addActionListener(new ActionListener()
{
public void actionPerfomed(ActionEvent event)
{
x1-=5;
repaint();
}
public void actionPerformed(ActionEvent e) {
throw new UnsupportedOperationException("Not supported yet.");
}
});
JButton b2 = new JButton ("=>");
bar.add(b2);
b2.addActionListener(new ActionListener()
{
public void actionPerfomed(ActionEvent event)
{
x1+=5;
repaint();
}
public void actionPerformed(ActionEvent e) {
throw new UnsupportedOperationException("Not supported yet.");
}
});
pane.add(bar,BorderLayout.NORTH);
}
class MyPanel extends JPanel
{
@Override
public void paintComponent(Graphics g)
{
super.paintComponent(g);
g.drawOval(x1, 50, 100, 100);
}
}
}
|
Подскажите, почему при нажатии кнопки "<=" или "=>" вместо сдвига выдает ошибку? |
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