import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
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 { public static void main(String args[]) {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
MainFrame frame = new MainFrame();
frame.setVisible(true);
} catch (Exception e) {
}
} 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(new FlowLayout());
final JButton btnStart = new JButton();
btnStart.setBounds(360, 15, 66, 28);
getContentPane().add(btnStart);
btnStart.addActionListener(new ActionListener() {
public void actionPerformed(final ActionEvent e) {
JLabel lblTest = new JLabel("AAAAAAAAAAAAAAA");
lblTest.setBounds(100, 100, 20, 20);
getContentPane().add(lblTest);
getContentPane().repaint();
}
});
btnStart.setText("开始");
}
}
点击开始按钮,增加一个标签,但为什么标签不显示呢?
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