Applet

最新推荐文章于 2024-03-04 22:19:35 发布

原创最新推荐文章于 2024-03-04 22:19:35 发布 · 389 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#applet #button #string #import #vector #class

本文介绍了一个简单的电话卡管理系统，使用Java实现。系统允许用户创建带有指定余额及密码的电话卡，并支持按余额排序存储电话卡信息。此外，还提供了查找特定电话卡的功能。

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;

public class Demo6_14 extends Applet implements ActionListener
{
    long CONNECT_NUMBER = 200;
    double CONNECT_FEE = 0.1;

    Label cardNumberLbl = new Label();
    Label balanceLbl = new Label("余额：");
    Label passwordLbl = new Label("密码");
    TextField balanceTfd = new TextField(8);
    TextField passwordTfd = new TextField(8);
    TextField searchIdxTfd = new TextField(8);
    Button createCard = new Button("创建");
    Button searchCard = new Button("查找");
    Label searchResult = new Label("查找结果："
        + "                                                  ");

    Vector phoneCardVector = new Vector();

    public void init()
    {
        balanceTfd.setText("");
        passwordTfd.setText("");
        searchIdxTfd.setText("");
        cardNumberLbl.setText("电话卡号：" + PhoneCard200.cardNumber200);

        add(cardNumberLbl);
        add(balanceLbl);
        add(balanceTfd);
        add(passwordLbl);
        add(passwordTfd);
        add(createCard);
        add(searchIdxTfd);
        add(searchCard);
        add(searchResult);

        passwordTfd.setEchoChar('*');
        searchResult.setAlignment(Label.LEFT);
        createCard.addActionListener(this);
        searchCard.addActionListener(this);
    }

    public void actionPerformed(ActionEvent ae)
    {
        PhoneCard200 phoneCard;

        if(ae.getSource() == createCard)
        {
            try
            {
                phoneCard = new PhoneCard200(Double.parseDouble(balanceTfd.getText()),passwordTfd.getText(),CONNECT_NUMBER,CONNECT_FEE);
                boolean added = false;
                for(int i=0; i<phoneCardVector.size(); i++)
                {
                    if(phoneCard.getBalance() <((PhoneCard200)(phoneCardVector.get(i))).getBalance())
                    {
                        phoneCardVector.insertElementAt(phoneCard,i);
                        added = true;
                        break;
                    }
                }
                if(!added)
                    phoneCardVector.add(phoneCard);

                cardNumberLbl.setText("电话卡号：" + PhoneCard200.cardNumber200);
                balanceTfd.setText("");
                passwordTfd.setText("");
                }
            catch(NumberFormatException nfe)
            {
                showStatus("输入的余额格式不对，请重输。");
                balanceTfd.setText("");
                passwordTfd.setText("");
            }
        }
        else if(ae.getSource() == searchCard)
        {
            try
            {
                Object obj;
                boolean found = false;

                long searchIndex = Long.parseLong(searchIdxTfd.getText());
                for(Enumeration e=phoneCardVector.elements();e.hasMoreElements(); )
                {
                    obj = e.nextElement();
                    if(obj instanceof PhoneCard200)
                    {
                        if( ((PhoneCard200)obj).getCardNumber()== searchIndex )
                        {
                            searchResult.setText("查找结果：" + ((PhoneCard200)obj).toString());
                            found = true;
                            repaint();
                            break;
                        }
                    }
                }
                if(!found)
                {
                    searchResult.setText("未找到。");
                    searchIdxTfd.setText("");
                }
            }
            catch(NumberFormatException nfe)
            {
                showStatus("查找域输入的卡号格式错误。");
                searchIdxTfd.setText("");
                searchResult.setText("查找结果：                 ");
            }
        }
        else
        {
            showStatus("事件" + ae.toString()+ "未定义处理操作");
            balanceTfd.setText("");
            passwordTfd.setText("");
        }
    }

    public void paint(Graphics g)
    {
        for(int i=0; i<phoneCardVector.size(); i++)
        {
            g.drawString(phoneCardVector.get(i).toString(),10, 150+20*i);
        }
    }

}

class PhoneCard200
{
    static long cardNumber200;
    long cardNumber;
    double balance;
    String password;
    long   connectNumber;
    double connectFee;

    static
    {
        cardNumber200 = 01;
    }

    public PhoneCard200(double b,String pwd,long cNum,double cFee)
    {
        cardNumber = cardNumber200++;
        balance = b;
        password = new String(pwd);
        connectNumber = cNum;
        connectFee = cFee;
    }

    public long getCardNumber()
    {
        return cardNumber;
    }

    public double getBalance()
    {
        return balance;
    }

    public String toString()
    {
        String s = "卡号：" + cardNumber + " 余额：" + balance+ " 密码：" + password+ " 连接号：" + connectNumber+ " 连接费：" + connectFee;
        return s;
    }
}