实验3 JAVA概述.doc

姓名 柳华 班级 信科1002班学号 100602207- 实验三 抽象/分装/类实验时间 第 6周 星期4 一、实验目的1 了解Java中的类，域；2 了解类的创建，类的方法；二、实验预备工作1 复习第4章JAVA相关的内容，掌握相应的知识。三、实验内容（1）import java.io.*;public class Usenumberpublic static void main(String args) Student stu1=new Student(100602207,1002,柳华,女,21); System.out.println(stu1.toString();stu1.changeAge(10);class Student long stuNumber; String stuName ; String stuSex; int stuYear; String stuClass; Student(long a,String b,String c,String d,int e) stuNumber=a; stuClass=b; stuName=c; stuSex=d; stuYear=e; public void changeAge(int age) stuYear=age; public String toString()String s=学号:+stuNumber+n班级:+stuClass+n姓名:+stuName+n性别:+stuSex+n年龄：+stuYear;return s;（2）import java.applet.Applet;import java.awt.*;import java.awt.event.*;public class UsePhoneCardApplet extends Applet implements ActionListener TextField cardNum; TextField passwd; TextField bal; TextField connectNum; Label l1,l2,l3,l4; Button btn; long cardNumber; private int password; double balance; String connectNumber; PhoneCard p1=new PhoneCard(1001001,8888,1000,200);public void init()cardNum=new TextField(10);passwd=new TextField(10);bal=new TextField(10);connectNum=new TextField(10);l1=new Label(卡号);l2=new Label(密码);l3=new Label(余额);l4=new Label(连接号);btn=new Button(确定);add(l1);add(cardNum);add(l2);add(passwd);add(l3);add(bal);add(l4);add(connectNum);add(btn);btn.addActionListener(this);public void actionPerformed(ActionEvent e)cardNumber=Long.valueOf(cardNum.getText().longValue();password=Integer.valueOf(passwd.getText().intValue();balance=Double.valueOf(bal.getText().doubleValue();connectNumber=connectNum.getText();p1.cardNumber=cardNumber;p1.setPassword(password);p1.balance=balance;p1.connectNumber=connectNumber;repaint();public void paint(Graphics g)g.drawString(p1.toString(),20,80);class PhoneCardlong cardNumber;private int password;double balance;String connectNumber;boolean connected;PhoneCard(long cn, int pw, double b,String s)cardNumber = cn;password = pw;if ( b 0 )balance = b;elseSystem.exit(1);connectNumber = s;connected = false;boolean performConnection(long cn,int pw)if(cn = cardNumber & pw = password ) connected = true;return trueelseconnected = false;return false；double getBalance()if(connected) return balance;else return -1;void performDial()if(connected)balance -= 0.5；public String toString()String s = 电话卡接入号码：+connectNumber+n电话卡卡号：+cardNumber+n电话卡密码：+password+n剩余金额：+balance;if(connected)return (s + n电话已接通。);elsereturn (s + n