jwindowdemo.java

我学习JAVA时的一些练习,可以供初学者使用

import javax.swing.*;
import java.awt.*;
import java.net.*;

public class JWindowDemo extends JFrame {


    Container container = getContentPane();
    JProgressBar progress = null;
    public JWindowDemo() {
        setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));

        URL url = getClass().getResource("login.jpg");

        if (url != null) {
            container.add(new JLabel(new ImageIcon(url)), BorderLayout.CENTER);
        }

        progress = new JProgressBar(1, 100);
        progress.setStringPainted(true);

        progress.setString("数据加载中,清稍候......");

        progress.setBackground(Color.white);

        container.add(progress, BorderLayout.SOUTH);

        Dimension screen = getToolkit().getScreenSize();

        pack();

        setLocation((screen.width - getSize().width) / 2,
                    (screen.height - getSize().height) / 2);

    }

    public void start() {
        this.toFront();
        Thread splashThread = new Thread() {
            public void run() {
                setVisible(true);
                try {
                    for (int i = 0; i < 100; i++) {
                        Thread.sleep(100);
                        progress.setValue(progress.getValue() + 1);
                    }
                }

                catch (Exception e) {
                    e.printStackTrace();
                }
                dispose();
                showFrame();

            }

        };
        splashThread.start();
    }


    void showFrame() {
        setSize(450, 450);
        setVisible(true);
    }

    public static void main(String[] args) {
        JWindowDemo splash = new JWindowDemo();
        splash.start();
    }

}