我想绘制圆圈并将其与中心对齐,但当我呼叫repaint()
时,没有任何反应。我尝试了几乎所有的东西,我已经改变了布局,对齐,但总是一样的。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();
}
}
}
答案 0 :(得分:3)
public void paintComponent(Graphics g){
super.paintComponents(g);
打破画颜链,它应该是:
public void paintComponent(Graphics g){
super.paintComponent(g); // no S in method name..