mainframe.java

一个JDBC应用的例子

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

public class MainFrame {
	// 我的显示器设置为1024*768，因此下列常量的值分别是：341(width), 192(height), 341(startX), 256(startY)
	private static int width = (int)Toolkit.getDefaultToolkit().getScreenSize().getWidth() / 3; 
	private static int height = (int)Toolkit.getDefaultToolkit().getScreenSize().getHeight() / 4;
	private static int startX = (int)Toolkit.getDefaultToolkit().getScreenSize().getWidth() / 3;
	private static int startY = (int)Toolkit.getDefaultToolkit().getScreenSize().getHeight() / 3;
	private static JFrame frame;
	private static JPanel contentPane;

	// 防止使用者创建MainFrame对象
	private MainFrame() { }

	public static void init() {
		init("欢迎进入Java语言的GUI世界");
	}
	public static void init(String title) {
		frame = new JFrame(title);
		frame.setLocation(new Point(startX, startY));
		contentPane = (JPanel)frame.getContentPane();
		contentPane.setPreferredSize(new Dimension(width, height));
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
	public static void init(String title, int w, int h) {
		width = w;  height = h;
		init(title);
	}
	public static void init(String title, int w, int h, int x, int y) {
		startX = x;  startY = y;
		width = w;  height = h;
		init(title);
	}
	public static void init(String title, int w, int h, int x, int y, String lookAndFeel) {
		startX = x;  startY = y;
		width = w;  height = h;
		try {
			if (lookAndFeel.equalsIgnoreCase("windows"))
				UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
			else if (lookAndFeel.equalsIgnoreCase("system")) 
				UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
			else if (lookAndFeel.equalsIgnoreCase("motif"))
				UIManager.setLookAndFeel("com.sun.java.swing.plaf.motif.MotifLookAndFeel");
			else UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
		} catch (Exception e) {}
		init(title);
	}
	public static void add(Component c) { contentPane.add(c, BorderLayout.CENTER); }
	public static void start() {
		frame.pack();
		frame.setVisible(true);
	}
	public static JPanel getContentPane() { return contentPane; }
	public static JFrame getMainFrame() { return frame; }
	public static int getWidth() { return width; }
	public static int getHeight() { return height; }
	public static int getStartX() { return startX; }
	public static int getStartY() { return startY; }
}