【Java编程】文字闪烁

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package Hello;

import java.awt.BorderLayout;
import java.awt.FlowLayout;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class Welcome extends JFrame implements Runnable {
	private JLabel label = new JLabel("Welcome", JLabel.CENTER);

	public Welcome() {
		JPanel p1 = new JPanel(new BorderLayout()); // 创建面板
		p1.add(label, BorderLayout.CENTER);
		add(p1);

	}

	public static void main(String[] args) {
		Welcome frame = new Welcome();
		frame.setSize(400, 300);
		frame.setLocationRelativeTo(null);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setVisible(true);
		Thread t1 = new Thread(frame);
		t1.start();

	}

	public void run() {
		try {
			while (true) {
				if (label.getText() == null)
					label.setText("Welcome");
				else
					label.setText(null);
				Thread.sleep(200); // 闪烁时间
			}
		} catch (InterruptedException ex) {

		}
	}
}