aaaaaaaaaaaaaaaaaaaaaaaaaaa

import java.awt.Dimension;
import java.awt.GraphicsEnvironment;
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.JPanel;

public class Main extends JFrame implements ActionListener {

	private static Main m = null;

	private static JPanel jp_north = null;
	private static Dimension screenSize = null;
	private static JLabel jl = null;
	private static JButton jb = null, jb2 = null;

	public Main() {

		jp_north = new JPanel();
		screenSize = GraphicsEnvironment.getLocalGraphicsEnvironment().getMaximumWindowBounds().getSize();
		this.setTitle("发票打印");
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		this.setSize(1280, 720);
		this.setLocation((screenSize.width - this.getWidth()) / 2, (screenSize.height - this.getHeight()) / 2);

		// jf.setExtendedState(JFrame.MAXIMIZED_BOTH); // 最大化
		// jf.setResizable(false);// 禁止最大化
		jb = new JButton("aa");
		jb.addActionListener((this));
		jp_north.add(jb);
		jb2 = new JButton("bb");
		jb2.addActionListener((this));
		jp_north.add(jb2);
		this.add(jp_north);

	}

	public static void main(String[] args) {
		m = new Main();
		m.setVisible(true);
	}

	@Override
	public void actionPerformed(ActionEvent e) {
		System.out.println(34);

	}
}