周漢濤-2013013003-實驗3(共21頁)

1、實驗三 內(nèi)部(nib)類、常用類及異常類的用法1實驗(shyn)目的（1）掌握(zhngw)Java中內(nèi)部類的用法、異常類的用法（2）掌握Java中String類常用方法、StringBuilder類的用法；（3）掌握System類、Date類、Calender類、DateFormat類、NumberFormat類、Random類與BigInteger及BigDecimal類的用法；（4）掌握Java中正則表達式的基本用法；2實驗內(nèi)容實驗題1 修改實驗二實驗題4，聲明一個局部變量String text = ;然后通過循環(huán)把數(shù)組中的成員（有序）添加到text中，修改方法JOptionPane.s

2、howMessageDialog();參數(shù)以顯示text。實驗代碼Product類package .nwsuaf.jp.p4.data;public class Product private String name;private float price;protected static int count;public Product(String name,float price)super(); = name;this.price = price;public void SetName(String name) = name;public String GetName()return

3、name;public void SetPrice(float price)this.price = price;public float GetPrice()return price;public int count()return count;/因為compareTo是作用于字符串的比較，所以(suy)這里用了一下Float類進行了轉(zhuǎn)化/public int compareTo(Product product)return new Float(GetPrice().compareTo(product.GetPrice(); Mp3Player類package .nwsuaf.jp.p4.d

4、ata;public class Mp3Player extends Productprivate String memory;public Mp3Player(String name,String memory,float price)super(name,price);this.memory = memory;count+;public void Setmemory(String memory)this.memory = memory;public String Getmemory()return memory;public String toString()return GetName(

5、)+ +(+Getmemory()+ MB+)+,+GetPrice()+ +RMB;Mobile類package .nwsuaf.jp.p4.data;public class Mobile extends Productprivate String type;public Mobile(String name,String type,float price)super(name,price);this.type=type;count+;public void Settype(String type)this.type = type;public String Gettype()return

6、 type;public String toString()return GetName()+ +Gettype()+ MB+,+GetPrice()+ +RMB;Comparable類package .nwsuaf.jp.p4.data;public interface Comparable public int compareTo(Product product);Store類package .nwsuaf.jp.p4;import javax.swing.JOptionPane;import .nwsuaf.jp.p4.data.Mobile;import .nwsuaf.jp.p4.d

7、ata.Mp3Player;import .nwsuaf.jp.p4.data.Product;public class Store public static void main(String args) Mobile phone1 = new Mobile(E365,China Mobile,1780.0f);Mobile phone2 = new Mobile(M330,China Mobile,1450.0f);Mp3Player player1 = new Mp3Player(Meizo X3,256 MB,399.0f);Mp3Player player2 = new Mp3Pla

8、yer(Meizo E5,215 MB,580.0f);Mp3Player player3 = new Mp3Player(Xlive XM MP3 Play,256 MB,930.0f);int count1=player3.count();Product products = phone1,phone2,player1,player2,player3; for(int i = 0;i products.length; i+) for(int j= i+1;j products.length; j+) if(pareTo(productsj)0) Product temp = product

9、sj; productsj = productsi; productsi = temp; String text = ;for(int m = 0;m products.length;m+)text += productsm.toString()+n;JOptionPane.showMessageDialog(null, The products are: nn+text+nThere are +count1+ products);實驗(shyn)結(jié)果 圖1 實驗(shyn)結(jié)果實驗(shyn)題2 用StringBuiler text = ;替換(t hun)String text = ;然

10、后通過循環(huán)使用StringBuiler類的append方法向text中把數(shù)組中的成員（按價格有序）添加到text中，修改方法JOptionPane.showMessageDialog()的參數(shù)以顯示text。運行結(jié)果如圖3-1所示。圖3-1實驗代碼Product類package .nwsuaf.jp.p4.data;public class Product private String name;private float price;protected static int count;public Product(String name,float price)super(); = nam

11、e;this.price = price;public void SetName(String name) = name;public String GetName()return name;public void SetPrice(float price)this.price = price;public float GetPrice()return price;public int count()return count;/因為compareTo是作用于字符串的比較，所以這里用了一下Float類進行(jnxng)了轉(zhuǎn)化/public int compareTo(Product produc

12、t)return new Float(GetPrice().compareTo(product.GetPrice(); Mp3Player類package .nwsuaf.jp.p4.data;public class Mp3Player extends Productprivate String memory;public Mp3Player(String name,String memory,float price)super(name,price);this.memory = memory;count+;public void Setmemory(String memory)this.m

13、emory = memory;public String Getmemory()return memory;public String toString()return GetName()+ +(+Getmemory()+ MB+)+,+GetPrice()+ +RMB;Mobile類package .nwsuaf.jp.p4.data;public class Mobile extends Productprivate String type;public Mobile(String name,String type,float price)super(name,price);this.ty

14、pe=type;count+;public void Settype(String type)this.type = type;public String Gettype()return type;public String toString()return GetName()+ +Gettype()+ MB+,+GetPrice()+ +RMB;Comparable類package .nwsuaf.jp.p4.data;public interface Comparable public int compareTo(Product product);Store類package .nwsuaf

15、.jp.p4;import javax.swing.JOptionPane;import .nwsuaf.jp.p4.data.Mobile;import .nwsuaf.jp.p4.data.Mp3Player;import .nwsuaf.jp.p4.data.Product;public class Store public static void main(String args) Mobile phone1 = new Mobile(E365,China Mobile,1780.0f);Mobile phone2 = new Mobile(M330,China Mobile,1450

16、.0f);Mp3Player player1 = new Mp3Player(Meizo X3,256 MB,399.0f);Mp3Player player2 = new Mp3Player(Meizo E5,215 MB,580.0f);Mp3Player player3 = new Mp3Player(Xlive XM MP3 Play,256 MB,930.0f);int count1=player3.count();Product products = phone1,phone2,player1,player2,player3; for(int i = 0;i products.le

17、ngth; i+) for(int j= i+1;j products.length; j+) if(pareTo(productsj)0) Product temp = productsj; productsj = productsi; productsi = temp; StringBuilder text = new StringBuilder();for(int m = 0;m products.length;m+)text.append(productsm.toString()+n);JOptionPane.showMessageDialog(null, The products a

18、re: nn+text+nThere are +count1+ products);實驗(shyn)結(jié)果 圖2 實驗(shyn)結(jié)果實驗(shyn)題3 從網(wǎng)上加載一個門戶網(wǎng)站首頁文件，用所學正則表達式知識，提取出其中所有郵箱地址。提示：讀取文件的語句為BufferedReader br = new BufferedReader(new FileReader(d:sharedxxx.html);while(line= br.readLine()!=null)parse(line);基本要求：編寫parse方法，完成上述功能。實驗代碼import java.io.BufferedReader;i

19、mport java.io.FileNotFoundException;import java.io.FileReader;import java.io.IOException;import java.util.regex.Matcher;import java.util.regex.Pattern;public class Mile public static void parse(String text)String regex = w.-+w.-+.w+;Pattern p = Ppile(regex);Matcher m = p.matcher(text);while(m.find()

20、String result = m.group();System.out.println(result);public static void main(String args) tryBufferedReader br = new BufferedReader(new FileReader(D:text1.txt);String text = ;while(text = br.readLine() != null)parse(text);catch (FileNotFoundException e)e.printStackTrace();catch(IOException e)e.print

21、StackTrace();實驗(shyn)結(jié)果 圖3.1 要打開(d ki)的文檔 圖3.2 搜索(su su)結(jié)果實驗(shyn)題4 修改實驗二實驗題4，在Product類中添加銷售日期屬性及銷售額屬性，在sell方法中對其初始化，比較Date類與Calender類的用法,最后使用SimpleDateFormat類對銷售日期進行格式化；用類DecimalFormat的相關(guān)方法格式化屬性sales，熟悉DecimalFormat的用法。運行結(jié)果如圖3-2所示。圖3-2實驗代碼Product類package .nwsuaf.jp.p4.data;import java.util.Calenda

22、r;import java.util.Date;public class Product private String name;private float price; private int sales;protected static int count;private Date date = new Date();public Product(String name,float price,int sales)super(); = name;this.price = price;this.sales = sales;public String Getdate() String s =

23、String.format(%tY-%tm-%td %tH:%tM:%tS.%tL,date); return s;public void SetName(String name) = name;public String GetName()return name;public void SetPrice(float price)this.price = price;public float GetPrice()return price;public int count()return count;public void setSales(int sale)this.sales = sale;

24、 public String GetSales() String Sales = String.format(%,d,sales); return Sales; public int compareTo(Product product)return new Float(GetPrice().compareTo(product.GetPrice(); Mp3Player類package .nwsuaf.jp.p4.data;public class Mp3Player extends Productprivate String memory;public Mp3Player(String nam

25、e,String memory,float price,int sales)super(name,price,sales);this.memory = memory;count+;public void Setmemory(String memory)this.memory = memory;public String Getmemory()return memory;public String toString()return GetName()+: +GetPrice()+ +RMB+,date and time of sale:+Getdate()+,sales:+GetSales()+

26、￥;Mobile類package .nwsuaf.jp.p4.data;public class Mobile extends Productprivate String type;public Mobile(String name,String type,float price,int sales)super(name,price,sales);this.type=type;count+;public void Settype(String type)this.type = type;public String Gettype()return type;public String toStr

27、ing()return GetName()+: +GetPrice()+ +RMB+,date and time of sale:+Getdate()+,sales:+GetSales()+￥;Comparable類package .nwsuaf.jp.p4.data;public interface Comparable public int compareTo(Product product);Store類package .nwsuaf.jp.p4;import java.util.Calendar;import javax.swing.JOptionPane;import .nwsuaf

28、.jp.p4.data.Mobile;import .nwsuaf.jp.p4.data.Mp3Player;import .nwsuaf.jp.p4.data.Product;public class Store public static void main(String args) Mobile phone1 = new Mobile(E365,China Mobile,1780.0f,106800);Mobile phone2 = new Mobile(M330,China Mobile,1450.0f,116000);Mp3Player player1 = new Mp3Player

29、(Meizo X3,256 MB,399.0f,46500);Mp3Player player2 = new Mp3Player(Meizo E5,215 MB,580.0f,17400);Mp3Player player3 = new Mp3Player(Xlive XM MP3 Play,256 MB,930.0f,7980);int count1=player3.count();Product products = phone1,phone2,player1,player2,player3;for(int i = 0;i products.length; i+)for(int j= i+

30、1;j products.length; j+)if(pareTo(productsj)0)Product temp = productsj;productsj = productsi;productsi = temp; String message = ;for(int m = 0; mproducts.length;m+)message += productsm.toString()+n;JOptionPane.showMessageDialog(null, The products are: nn+message+nThere are +count1+ products);實驗(shyn

31、)結(jié)果 圖4 實驗(shyn)結(jié)果實驗(shyn)題 5 編寫一個程序，輸入一個班某門課程成績，統(tǒng)計及格人數(shù)、不及格人數(shù)平均分。為此設(shè)計一個異常類，當輸入的成績小于0分或大于100分時，拋出異常，程序?qū)⒉蹲竭@個異常，并作出相應處理?；疽螅?編寫完整程序輸入分數(shù)大于100分異常類： SuppressWarnings(serial) public class update extends Exception public String ShowMistake() return 輸入分數(shù)(fnsh)大于100，請重新輸入; （2）輸入分數(shù)(fnsh)小于0分類： SuppressWarnings

32、(serial) public class downdate extends Exception public String ShowMistake() return 輸入分數(shù)(fnsh)小于0，請重新輸入：; 異常拋出類及主方法： import java.util.Scanner; public class Score public void ThrowMistake(double fraction) throws downdate,update if(fraction 100) throw new update();/分數(shù)大于100異常拋出 public static void main(

33、String args) int down = 0,up = 0; double fraction,average,sum = 0; Score score = new Score(); System.out.println(請輸入班級總?cè)藬?shù):); SuppressWarnings(resource) Scanner i = new Scanner(System.in); int n = i.nextInt(); SuppressWarnings(resource) Scanner fra = new Scanner(System.in); for (int j = 1;j = 60&frac

34、tion =100) up+;/計算及格(j g)人數(shù) sum = sum +fraction; Down = n - up;/計算(j sun)不及格人數(shù) average = sum/n;/求平均(pngjn)分數(shù) System.out.println(平均分數(shù)： + average); System.out.println(不及格人數(shù)： + down); System.out.println(及格人數(shù)： + up); 實驗結(jié)果 圖5.1 輸入分數(shù) 圖5.2 計算結(jié)果實驗題6 設(shè)計類ReflectTester，該類中有一方法copy（Object obj），該方法能夠創(chuàng)建一個和參數(shù)obj同樣

35、類型的對象，然后把obj對象中所有屬性復制到新建對象中，并將它返回?；?jbn)要求：設(shè)計相關(guān)類完成上述功能（只要求復制簡單JavaBean，且每個JavaBean的每個屬性都有public類型的getXxx()和setXxx()方法）。實驗(shyn)代碼ReflectTester類import java.lang.reflect.Field;import java.lang.reflect.InvocationTargetException;import java.lang.reflect.Method;public class ReflectTester public Object c

36、opy(Object obj) throws ExceptionClassclassType = obj.getClass();System.out.println(class name:+classType.getName();Object objectofcopy = classType.getConstructor(new Class).newInstance(new Object);Field fileds = classType.getDeclaredFields();for(Field file:fileds)String fieldName = file.getName();St

37、ring firstLetter = fieldName.substring(0, 1).toUpperCase();String getMethodName = Get+firstLetter+fieldName.substring(1);String setMethodName = Set+firstLetter + fieldName.substring(1);Method getMethod = classType.getMethod(getMethodName, new Class);Method setMethod = classType.getMethod(setMethodNa

38、me,file.getType();Object value = getMethod.invoke(obj,new Object);System.out.println(fieldName+,+value);setMethod.invoke(objectofcopy, new Objectvalue);return objectofcopy;public static void main(String args) throws ExceptionProduct product = new Product(How to learn java,80.0f);System.out.println(product.toString(); Product productofcopy = (Product)new ReflectTester().copy(product);System.out.println(Copy information:n+name,+productofcopy.GetName()+n+price:+productofcopy.GetPrice();Pr