import java.awt.Color;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.UIManager;
public class MainFrame extends JFrame {
private static final long serialVersionUID = 1L;
public static void main(String args[]) {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
MainFrame frame = new MainFrame();
frame.setVisible(true);
} catch (Exception e) {
}
}
int count;
public MainFrame() {
setSize(800, 600);
getContentPane().setBackground(Color.WHITE);
Dimension size = Toolkit.getDefaultToolkit().getScreenSize();
this.setLocation((int) (size.getWidth() - this.getWidth()) / 2,
(int) (size.getHeight() - this.getHeight()) / 2);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
getContentPane().setLayout(null);
final JButton btnStart = new JButton();
btnStart.setBounds(360, 15, 100, 28);
getContentPane().add(btnStart);
btnStart.addActionListener(new ActionListener() {
public void actionPerformed(final ActionEvent e) {
JLabel lblTest = new JLabel("这是内容,这里主要体现的是repaint()这个函数. "
+ count);
getContentPane().removeAll();
getContentPane().add(btnStart);
lblTest.setBounds(100, 100, 400, 200);
getContentPane().add(lblTest);
repaint();
count++;
}
});
btnStart.setText("重新绘制");
}
}
