e_banksave.java

简单的电子银行系统主要实现取钱存钱转账 系统很简单请大家帮我看看啊也可以给点意见是和数据库连接的

package e_BankSystem_Data;

import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.sql.ResultSet;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.border.TitledBorder;

public class E_BankSave implements ActionListener {
		private JFrame f;
		private JPanel cp;
		private JLabel lab1;
		private JTextField tf1;
		private JButton btn1,btn2;
		private String str,st;
		E_Bank b;
		
	public E_BankSave(String str,String st)
	{
		this.str=str;
		this.st=st;
		init();
	}
	
	private void init()
	{
		f=new JFrame("电子银行系统-存款");
		cp=new JPanel();
		lab1=new JLabel("输入您的存款金额：");
		tf1=new JTextField(20);
		btn1=new JButton("确定");
		btn2=new JButton("返回");
		
		btn1.addActionListener(this);
		btn2.addActionListener(this);
		
		cp.add(lab1);	
		cp.add(tf1);
		cp.add(btn1);
		cp.add(btn2);
		
		f.add(cp);
		f.addWindowListener(new WindowAdapter(){
	     	 public void windowClosing(WindowEvent e){
	     	   f.setVisible(false);
	     	 }
	     });
		
		lab1.setFont(new Font("楷体_GB2312",Font.TRUETYPE_FONT,18));
		lab1.setBounds(40, 40, 250, 50);
		tf1.setBounds(205, 55, 170, 25);	
		btn1.setBounds(170, 125, 60, 30);
		btn2.setBounds(260, 125, 60, 30);

		
		cp.setBorder(new TitledBorder("网上电子银行-存款"));
		cp.setLayout(null);			
		cp.setSize(450, 200);
		cp.setLocation(80, 80);
		cp.setVisible(true);	
		
		f.setLayout(null);
		//f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		f.setSize(600, 500);
		f.setLocation(350, 150);
		f.setVisible(true);
	}
	public void actionPerformed(ActionEvent e)
	{
		JButton btn=(JButton) e.getSource();
		BDataControl bcn=new BDataControl();
		try
		{
			if(btn==btn1)
			{			
					String st1;
					bcn.executeUpdate("update E_BankTable set momeny=momeny+"+tf1.getText()+"where sno="+str);	
					bcn.executeUpdate("update E_BankMomeny set momeny=momeny+"+tf1.getText()+" where sno="+str);
					ResultSet resultset = bcn.executeQuery("select * from E_BankMomeny where sno="+str);
					JOptionPane.showMessageDialog(cp, "   操作成功！", "", 1);
					st1=bcn.getData(1, resultset).firstElement().toString();
					new E_BankSelect(st1);
			}
			if(btn==btn2)
			{
				f.setVisible(false);
				new E_Bank(str,st);
			}
				
		}
		catch(NullPointerException e1){
				
			}
		
	}

}