小小的火车票查询系统 java

lostlove — Thu, 27 Sep 2007 10:35:02 +0800

作者: lostlove 链接：http://lostlove.javaeye.com/blog/127477 发表时间: 2007年09月27日

声明：本文系JavaEye网站发布的原创博客文章，未经作者书面许可，严禁任何网站转载本文，否则必将追究法律责任！

    代码很少，无聊随便写写，大家看看！
与数据库相关的在 sqlfa.java里主窗口在trainfram.java里！1个多小时，好久没有写了，感觉有点陌生！哈哈
sqlfa.java
package workfive;
import java.sql.*;
class sqlfa{
    //连驱动,数据源
    String driver="sun.jdbc.odbc.JdbcOdbcDriver";
    Connection con=null;
    Statement stmt=null;
     String sql=null;
     String bbsql;

    void lian_driver(){
        String yuan="jdbc:odbc:test";
        try{
            Class.forName(driver);

        }catch(ClassNotFoundException e){}
        try{
            con=DriverManager.getConnection(yuan);
            stmt=con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY);
        }catch(SQLException ee){}
    }
    //查询

   public ResultSet fan_guo()throws SQLException{
        ResultSet guo=null;
        guo=stmt.executeQuery(sql);
        return guo;
    }
    //接收，修改查询语句
    void xiugai_sql(String ru){
        this.sql="select * from TrainTicket where TrainNo='"+ru+"'";

    }
    //计算
    public float jisuan(int xx,float yy){
        return xx*yy;
    }
    //更新语句
    void gengxin(int sit_x,int bed_x,String no,boolean n)throws SQLException{
        if(n){

            this.bbsql = "update trainticket set seatnum="+sit_x+" where trainno='"+no+"'";
        }else
        {
            this.bbsql = "update trainticket set bednum="+bed_x+" where trainno='"+no+"'";
        }
        stmt.executeQuery(bbsql);
    }
}
下面是主窗口
package workfive;

import java.awt.BorderLayout;

import javax.swing.JFrame;
import javax.swing.JLabel;
import java.awt.Rectangle;
import javax.swing.JRadioButton;
import javax.swing.JTextField;
import javax.swing.JButton;
import java.sql.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JOptionPane;
import javax.swing.ButtonGroup;

public class trainfram extends JFrame {
    public trainfram() {
        try {
            jbInit();
        } catch (Exception exception) {
            exception.printStackTrace();
        }
    }
    sqlfa mm=new sqlfa();
    ResultSet guoguo=null;
    float sum;
    float yun=15;
    static boolean panduan=true;
    int sit_yu,bed_yu;
    //*****
    public float jisuan(int xx,float yy){
    return xx*yy;
}

    //计算
    void ji_suan(boolean nn)throws Exception{
        if(nn)
        {
            this.sit_yu=this.guoguo.getInt("seatNum")-Integer.parseInt(this.txt_num.getText());
            this.sum=this.jisuan(Integer.parseInt(this.txt_num.getText()),this.guoguo.getFloat("seatprice"));

        }
        else{
            this.bed_yu=this.guoguo.getInt("bedNum")-Integer.parseInt(this.txt_num.getText());
            this.sum=this.jisuan(Integer.parseInt(this.txt_num.getText()),this.guoguo.getFloat("bedprice"));}
    }
    //传递
    void chuan(){
        mm.xiugai_sql(this.txt_no.getText());
    }
    //show
    void showshow()throws SQLException{
        this.chuan();
        mm.lian_driver();
        this.guoguo=mm.fan_guo();
        if(this.guoguo.next())
           //{ this.guoguo.next();}else {this.guoguo.close();}

        {
//           try{
//              this.ji_suan(this.yingzuo.isSelected());
   //         }catch(Exception af){}
          this.panduan=true;
          this.ceshi();
          this.guoguo.close();
       }
        else{this.txt_num.setText("");
            this.panduan=false;
            this.ceshi();
            this.guoguo.close();
        }
    }

    private void jbInit() throws Exception {
        getContentPane().setLayout(null);
        jb_top.setText("订购火车票");
        jb_top.setBounds(new Rectangle(154, 18, 80, 32));
        checi.setText("火车车次:");
        checi.setBounds(new Rectangle(60, 86, 83, 29));
        fangshi.setText("乘车方式:");
        fangshi.setBounds(new Rectangle(58, 145, 70, 28));
        yingzuo.setText("硬座");
        yingzuo.setBounds(new Rectangle(139, 147, 71, 23));
        yingzuo.addActionListener(new trainfram_yingzuo_actionAdapter(this));
        yingwo.setText("硬卧");
        yingwo.setBounds(new Rectangle(225, 145, 64, 26));
        yingwo.addActionListener(new trainfram_yingwo_actionAdapter(this));
        shuliang.setText("订购数量：");
        shuliang.setBounds(new Rectangle(56, 212, 78, 33));
        txt_num.setBounds(new Rectangle(143, 214, 120, 28));
        txt_no.setBounds(new Rectangle(141, 86, 125, 29));
        jb_ok.setBounds(new Rectangle(151, 285, 108, 40));
        jb_ok.setText("确定");
        jb_ok.addActionListener(new trainfram_jb_ok_actionAdapter(this));
        this.setSize(450,450);
        jop_wrong.setToolTipText("");
        jop_wrong.setBounds(new Rectangle(66, 119, 262, 90));
        jop_wrong.setLayout(null);
        this.getContentPane().add(checi);
        this.getContentPane().add(fangshi);
        this.getContentPane().add(yingzuo);
        this.getContentPane().add(yingwo);
        this.getContentPane().add(shuliang);
        this.getContentPane().add(txt_num);
        this.getContentPane().add(txt_no);
        this.getContentPane().add(jb_ok);
        this.getContentPane().add(jop_wrong);
        this.getContentPane().add(jb_top);
        this.setVisible(true);
        but_zu.add(yingzuo);
        but_zu.add(yingwo);
    }
    //测试
void ceshi()throws SQLException{
        if(this.panduan)
        {
            if(this.yingzuo.isSelected()&this.guoguo.getInt("seatNum")>=Integer.parseInt(this.txt_num.getText())|this.yingwo.isSelected()&this.guoguo.getInt("bedNum")>=Integer.parseInt(this.txt_num.getText()))

               { try{
                    this.ji_suan(this.yingzuo.isSelected());
                }catch(Exception af){}
              JOptionPane.showMessageDialog(jop_wrong,"请付款"+this.sum);
                 mm.gengxin(this.sit_yu,this.bed_yu,this.guoguo.getString("trainNo"),this.yingzuo.isSelected());
             }
             else{
                 JOptionPane.showMessageDialog(jop_wrong,"票数不够，请重新输入！");
             }
        }else
       {

           JOptionPane.showMessageDialog(jop_wrong,"您输入的车次不存在，请重新输入！");

       }
}

    public static void main(String[] args) {
        trainfram trainfram = new trainfram();
    }

    JLabel jb_top = new JLabel();
    JLabel checi = new JLabel();
    JLabel fangshi = new JLabel();
    JRadioButton yingzuo = new JRadioButton("",true);
    JRadioButton yingwo = new JRadioButton();
    JLabel shuliang = new JLabel();
    JTextField txt_num = new JTextField();
    JTextField txt_no = new JTextField();
    JButton jb_ok = new JButton();
    JOptionPane jop_wrong = new JOptionPane();
    ButtonGroup but_zu = new ButtonGroup();
    public void jb_ok_actionPerformed(ActionEvent e) {
        try{
            this.showshow();
        }catch(SQLException aaa){}
    }

    public void yingzuo_actionPerformed(ActionEvent e) {

    }

    public void yingwo_actionPerformed(ActionEvent e) {

    }
}

class trainfram_yingwo_actionAdapter implements ActionListener {
    private trainfram adaptee;
    trainfram_yingwo_actionAdapter(trainfram adaptee) {
        this.adaptee = adaptee;
    }

    public void actionPerformed(ActionEvent e) {
        adaptee.yingwo_actionPerformed(e);
    }
}

class trainfram_yingzuo_actionAdapter implements ActionListener {
    private trainfram adaptee;
    trainfram_yingzuo_actionAdapter(trainfram adaptee) {
        this.adaptee = adaptee;
    }

    public void actionPerformed(ActionEvent e) {
        adaptee.yingzuo_actionPerformed(e);
    }
}

class trainfram_jb_ok_actionAdapter implements ActionListener {
    private trainfram adaptee;
    trainfram_jb_ok_actionAdapter(trainfram adaptee) {
        this.adaptee = adaptee;
    }

    public void actionPerformed(ActionEvent e) {
        adaptee.jb_ok_actionPerformed(e);
    }
}
大家看了，给点意见。谢谢了。。。。还有好多没有时间发。。。
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java 入门之我看

lostlove — Sat, 21 Jul 2007 09:29:44 +0800

作者: lostlove 链接：http://lostlove.javaeye.com/blog/103561 发表时间: 2007年07月21日

声明：本文系JavaEye网站发布的原创博客文章，未经作者书面许可，严禁任何网站转载本文，否则必将追究法律责任！

从来都没想过会对java产生那么大的兴趣，从c++到java有一点感触，不敢独享。

刚开始，看到java的代码就晕，跟c的简洁比起来。后来随着学习的深入，感觉未来真的是java的世界了，对她的完全面向对象。。呵呵！

个人感觉想入门java首先要有耐心，因为有的时候一个在c里面很简单很小的问题，在java里都是一个比较复杂的过程，比如对程序的输入c里的scanf 多简单，但是在java里你可能就不是这么容易了，输入输出流，要耐心看！还有个人感觉书写特别是java代码一定要注意规范，因为有的时候一点不注意，就会怎么错的也不知道，还要清楚一点，所有的定义都是相对于类的不像c的是真正意义上的全局，简单的说就是只能定义在类里，当然这只是小问题，注意就好！还有，要清楚什么时候用static比较好，比如操作数据库，关键是要有自己的思想！想明白了，什么就好办了！

还有多看看别人的代码，怎样才能更简洁，更有效率！想学好编程，两个字“思考”！累了，小学语文不好！

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