重绘()不工作
repaint() is not working
我想画圆并将其居中对齐,但是当我调用 repaint()
时没有任何反应。我几乎尝试了一切,我改变了布局、对齐方式,但总是一样。这是我的代码:
public class Frame extends JFrame {
JButton button,dugme;
JLabel lab;
public Frame(){
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(480,320);
setResizable(false);
setLocationRelativeTo(null);
setLayout(new FlowLayout());
setVisible(true);
button = new JButton("Klikni me");
button.setSize(75,75);
add(button);
button.setHorizontalAlignment(SwingConstants.RIGHT);
dugme= new JButton("Klikni opet");
dugme.setSize(75,75);
add(dugme);
dugme.setHorizontalAlignment(SwingConstants.LEFT);
lab = new JLabel("Ovde je tekst koji se menja");
add(lab);
lab.setHorizontalAlignment(SwingConstants.CENTER);
Handler handler = new Handler();
Handler1 handler1= new Handler1();
repaint();
button.addActionListener(handler);
dugme.addActionListener(handler1);
}
public void paintComponent(Graphics g){
super.paintComponents(g);
g.fillOval(30, 30, 60, 75);
}
public class Handler implements ActionListener{
public void actionPerformed(ActionEvent e){
repaint();
lab.setText("New text");
}
}
public class Handler1 implements ActionListener{
public void actionPerformed(ActionEvent e){
lab.setText("Same text again ");
repaint();
}
}
}
public void paintComponent(Graphics g){
super.paintComponents(g);
打破油漆链,应该是:
public void paintComponent(Graphics g){
super.paintComponent(g); // no S in method name..
我想画圆并将其居中对齐,但是当我调用 repaint()
时没有任何反应。我几乎尝试了一切,我改变了布局、对齐方式,但总是一样。这是我的代码:
public class Frame extends JFrame {
JButton button,dugme;
JLabel lab;
public Frame(){
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(480,320);
setResizable(false);
setLocationRelativeTo(null);
setLayout(new FlowLayout());
setVisible(true);
button = new JButton("Klikni me");
button.setSize(75,75);
add(button);
button.setHorizontalAlignment(SwingConstants.RIGHT);
dugme= new JButton("Klikni opet");
dugme.setSize(75,75);
add(dugme);
dugme.setHorizontalAlignment(SwingConstants.LEFT);
lab = new JLabel("Ovde je tekst koji se menja");
add(lab);
lab.setHorizontalAlignment(SwingConstants.CENTER);
Handler handler = new Handler();
Handler1 handler1= new Handler1();
repaint();
button.addActionListener(handler);
dugme.addActionListener(handler1);
}
public void paintComponent(Graphics g){
super.paintComponents(g);
g.fillOval(30, 30, 60, 75);
}
public class Handler implements ActionListener{
public void actionPerformed(ActionEvent e){
repaint();
lab.setText("New text");
}
}
public class Handler1 implements ActionListener{
public void actionPerformed(ActionEvent e){
lab.setText("Same text again ");
repaint();
}
}
}
public void paintComponent(Graphics g){
super.paintComponents(g);
打破油漆链,应该是:
public void paintComponent(Graphics g){
super.paintComponent(g); // no S in method name..