frame.java

java开发的公交查询系统

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
public class frame extends JFrame
{
	JPanel jp,jpl,jpr;
	JLabel jl;
	JButton jb1,jb2,jb3;
	Jp1 jp1;
	Jp2 jp2;
	Jp3 jp3;
	CardLayout cl;
	public frame()
	{
		setTitle("南昌市公交查询系统");
		jp=new JPanel();
		jpl=new JPanel();
		jpr=new JPanel();
		jp1=new Jp1();
		jp2=new Jp2();
		jp3=new Jp3();
		jp=(JPanel)this.getContentPane();
		jl=new JLabel("南昌市公交查询系统");
		jb1=new JButton("换乘查询");
		jb2=new JButton("路线查询");
		jb3=new JButton("站点查询");
		jp.setLayout(new BorderLayout());
		jpl.setLayout(new GridLayout(3,1));
		cl=new CardLayout();
		jpr.setLayout(cl);
		jpl.add(jb1);	
		jpl.add(jb2);
		jpl.add(jb3);
		jp.add(jl,BorderLayout.NORTH);
		jp.add(jpl,BorderLayout.WEST);
		jpr.add("first",jp1);
		jpr.add("second",jp2);
		jpr.add("last",jp3);
		jp.add(jpr,BorderLayout.CENTER);
		jl.setBorder(new JTextField().getBorder());
		jl.setHorizontalAlignment(SwingConstants.CENTER);
		jl.setFont(new java.awt.Font("楷体", 0, 15));
		jb1.setFont(new java.awt.Font("楷体", 0, 12));
		jb2.setFont(new java.awt.Font("楷体", 0, 12));
		jb3.setFont(new java.awt.Font("楷体", 0, 12));
		this.setSize(450,300);
		Dimension screenDim = Toolkit.getDefaultToolkit().getScreenSize();
		setLocation( ( ( screenDim.width - getSize().width ) / 2 ),( ( screenDim.height - getSize().height ) / 2) );	
		jb1.addActionListener(new JBL());
		jb2.addActionListener(new JBL());
		jb3.addActionListener(new JBL());
	}
	public static void main(String args[])
	{
		frame fra=new frame();
		fra.setUIFont(new javax.swing.plaf.FontUIResource("楷体",Font.PLAIN,12));
		fra.setVisible(true);
	}
	protected void processWindowEvent(WindowEvent eee)
	{
		if (eee.getID()==WindowEvent.WINDOW_CLOSING)
		{
			System.exit(0);
		}
	}
	public static void setUIFont(javax.swing.plaf.FontUIResource f)
	{
		java.util.Enumeration keys = UIManager.getDefaults().keys();
		while(keys.hasMoreElements())
		{
			Object key = keys.nextElement();
			Object value = UIManager.get(key);
			if(value instanceof javax.swing.plaf.FontUIResource)
			{
				UIManager.put(key,f);
			}
		}
	}
	public class JBL implements ActionListener
	{
		public void actionPerformed(ActionEvent e1)
		{
			if(e1.getSource()==jb1)
			{
				cl.first(jpr);
			}
			if(e1.getSource()==jb2)
			{
				cl.first(jpr);
				cl.next(jpr);
			}
			if(e1.getSource()==jb3)
			{
				cl.last(jpr);
			}
		}
	}		
}