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

import javax.swing.*;
import javax.swing.border.TitledBorder;

public class E_BankChange implements ActionListener
{
		private JFrame f;
		private JPanel cp;
		private JLabel lab1,lab2,lab3;
		private JTextField tf1,tf2,tf3;
		private JButton btn1,btn2;
		private String str,st;
		
	public E_BankChange(String str,String st) 
	{
		this.str=str;
		this.st=st;
		init();
	}
		
	private void init()
	{
		f=new JFrame("电子银行系统-转账");
		cp=new JPanel();
		lab1=new JLabel("输入您的账号：");
		lab2=new JLabel("输入对方账号：");
		lab3=new JLabel("转出金额：");
		tf1=new JTextField(20);
		tf2=new JTextField(20);
		tf3=new JTextField(20);
		btn1=new JButton("确定");
		btn2=new JButton("返回");
		
		btn1.addActionListener(this);
		btn2.addActionListener(this);
		
		cp.add(lab1);	
		cp.add(lab2);
		cp.add(lab3);
		cp.add(tf1);
		cp.add(tf2);
		cp.add(tf3);
		cp.add(btn1);
		cp.add(btn2);
		
		f.add(cp);
		f.addWindowListener(new WindowAdapter(){
	     	 public void windowClosing(WindowEvent e){
	     	   f.setVisible(false);	
	     	 }
	     });
				
		lab1.setBounds(80, 55, 100, 30);
		lab2.setBounds(80, 100, 100, 30);
		lab3.setBounds(105, 145, 80, 30);	
		tf1.setBounds(180, 60, 180, 20);
		tf2.setBounds(180, 105, 180, 20);
		tf3.setBounds(180, 150, 180, 20);
		btn1.setBounds(150, 245, 60, 30);
		btn2.setBounds(235, 245, 60, 30);	
		
		cp.setBorder(new TitledBorder("网上电子银行-转账"));
		cp.setLayout(null);
		cp.setSize(450, 350);
		cp.setLocation(80, 50);
		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)
			{		
				if(str.equals(tf1.getText()))
				{
					String st1;
					bcn.executeUpdate("update E_BankTable set momeny=momeny-"+tf3.getText()+"where sno="+tf1.getText());	
					bcn.executeUpdate("update E_BankMomeny set momeny=momeny-"+tf3.getText()+" where sno="+tf1.getText());
					bcn.executeUpdate("update E_BankTable set momeny=momeny+"+tf3.getText()+"where sno="+tf2.getText());	
					bcn.executeUpdate("update E_BankMomeny set momeny=momeny+"+tf3.getText()+" where sno="+tf2.getText());
					ResultSet resultset = bcn.executeQuery("select * from E_BankMomeny where sno="+tf1.getText());
					JOptionPane.showMessageDialog(cp, "   操作成功！", "", 1);
					st1=bcn.getData(1, resultset).firstElement().toString();
					new E_BankSelect(st1);
				}
				if(!str.equals(tf1.getText()))
					JOptionPane.showMessageDialog(cp, "  输入正确的账号！", "", 1);
			}
				if(btn==btn2)
				{
					str=tf1.getText();
					f.setVisible(false);
					new E_Bank(str,st);
				}	
		}
		catch(NullPointerException e1){
			System.out.println(e1.getMessage());
			}
		
	}
}