201771010137 赵栋《面向对象程序设计(java)》第十一周学习总结

一:理论部分。

1.数据结构:分为a.线性数据结构,如线性表、栈、队列、串、数组和文件。

                          b.非线性数据结构,如树和图。

1)所有数据元素在同一个线性表中必须是相同的数据类型。

线性表按其存储结构可分为顺序表和链表。

2)栈:也是一种特殊的线性表,是一种后进先出(LIFO)的结构。

栈是限定仅在表尾进行插入和删除运算的线性表,表尾称为栈顶,表头称为栈底。

3)队列:限定所有的插入只能在表的一端进行,而所有的删除都在表的另一端进行的线性表。是一种先进先出(FIFO)的结构。

表中允许插入的一端称为队尾,允许删除的一端称为队头。

2.集合:(容器)是一种包含多个元素并提供对所包含元素操作方法的类,其包含的元素可以由同一类型的对象组成,也可以由不同类型的对象组成。

1)集合框架:JAVA集合类库的统一架构。

2)集合类的作用(包含在java.util包中):提供一些基本数据结构的支持,如Vector、Hashtable、Stack等。

3)集合类的特点:a.只容纳对象;

                               b.集合类容纳的对象都是Object类的实例(一旦把一个对象置入集合类中,它的类信息将丢失)

4)Vector类:类似长度可变的数组。它只能存放对象,其元素通过下标进行访问。

5)Stack类(Vector的子类):它描述堆栈数据结构。(所有对象都有一个散列码,可以通过Object类的hashCode方法获得。)

3.集合框架中的基本接口:a.Collection(构造类集框架的基础):集合层次中的根接口,JDK未提供这个接口的直接实现类。

                                           b.Set:不能包含重复的元素,即元素必须唯一。对象可能不是按存放的次序存放。(实 现 Set 接口的类有HashSet,TreeSet)

                                           c.List:有序的集合,可以包含重复的元素。提供了按索引访问的方式。实现它的类有ArrayList和LinkedLis(如ArrayList:能够自动增长容量的数组)

                                           d.Map:Map接口映射唯一关键字到值。包含了key-value对。Map不能包含重复的key。SortedMap是一个按照升序排列key的Map。

二:实验部分。

1、实验目的与要求

(1) 掌握Vetor、Stack、Hashtable三个类的用途及常用API;

(2) 了解java集合框架体系组成;

(3) 掌握ArrayList、LinkList两个类的用途及常用API。

(4) 了解HashSet类、TreeSet类的用途及常用API。

(5)了解HashMap、TreeMap两个类的用途及常用API;

(6) 结对编程(Pair programming)练习,体验程序开发中的两人合作。

2、实验内容和步骤

实验1: 导入第9章示例程序,测试程序并进行代码注释。

测试程序1:

l 使用JDK命令运行编辑、运行以下三个示例程序,结合运行结果理解程序;

l 掌握Vetor、Stack、Hashtable三个类的用途及常用API。 

示例程序1:

复制代码
import java.util.Vector;

class Cat {
    private int catNumber;

    Cat(int i) {
        catNumber = i;
    }

    void print() {
        System.out.println("Cat #" + catNumber);
    }
}

class Dog {
    private int dogNumber;

    Dog(int i) {
        dogNumber = i;
    }

    void print() {
        System.out.println("Dog #" + dogNumber);
    }
}

public class CatsAndDogs {
    public static void main(String[] args) {
        Vector cats = new Vector();
        for (int i = 0; i < 7; i++)
            cats.addElement(new Cat(i));
        cats.addElement(new Dog(7));
        for (int i = 0; i < cats.size(); i++)
            ((Cat) cats.elementAt(i)).print();//进行强制类型转化
    }
}
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程序运行结果如下:

                                                                                                

由程序运行结果可知,程序在强制转换类型时出现异常,更改后程序如下:

复制代码
import java.util.Vector;

class Cat {
    private int catNumber;

    Cat(int i) {
        catNumber = i;
    }

    void print() {
        System.out.println("Cat #" + catNumber);
    }
}

class Dog {
    private int dogNumber;

    Dog(int i) {
        dogNumber = i;
    }

    void print() {
        System.out.println("Dog #" + dogNumber);
    }
}

public class CatsAndDogs {
    public static void main(String[] args) {
        Vector cats = new Vector();
        for (int i = 0; i < 7; i++)
            cats.addElement(new Cat(i));
        cats.addElement(new Dog(7));
        for (int i = 0; i < cats.size(); i++)
            if (cats.elementAt(i) instanceof Cat) //判断是否能进行强制类型转换
            {
                ((Cat) cats.elementAt(i)).print();//能进行强制类型转换,输出为Cat型
            } else {
                ((Dog) cats.elementAt(i)).print();//不能进行强制类型转化,输出为Dog型
            }
    }
}
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程序运行结果如下:

示例程序2:

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import java.util.*;

public class 333{
static String[] months = { "1", "2", "3", "4" }; public static void main(String[] args) { Stack stk = new Stack(); for (int i = 0; i < months.length; i++) stk.push(months[i]);//进栈 System.out.println(stk); System.out.println("element 2=" + stk.elementAt(2)); while (!stk.empty()) System.out.println(stk.pop());//输出出栈元素 } }
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程序运行结果如下:

示例程序3:

复制代码
import java.util.*;

class Counter {
int i = 1; public String toString() { return Integer.toString(i); } } public class Statistics { public static void main(String[] args) { Hashtable ht = new Hashtable(); for (int i = 0; i < 10000; i++) { Integer r = new Integer((int) (Math.random() * 20)); if (ht.containsKey(r)) ((Counter) ht.get(r)).i++; else ht.put(r, new Counter()); } System.out.println(ht); } }
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程序运行结果如下:

测试程序2:

使用JDK命令编辑运行ArrayListDemo和LinkedListDemo两个程序,结合程序运行结果理解程序;

ArrayListDemo:

复制代码
import java.util.*;

public class ArrayListDemo
{
    public static void main(String[] argv) {
        ArrayList al = new ArrayList();
        
        al.add(new Integer(11));
        al.add(new Integer(12));
        al.add(new Integer(13));
        al.add(new String("hello"));
        // First print them out using a for loop.
        System.out.println("Retrieving by index:");
        for (int i = 0; i < al.size(); i++) {
            System.out.println("Element " + i + " = " + al.get(i));
        }
    }
}
复制代码

程序运行结果如下:

LinkedListDemo:

程序运行结果如下:

l 在Elipse环境下编辑运行调试教材360页程序9-1,结合程序运行结果理解程序;

l 掌握ArrayList、LinkList两个类的用途及常用API。

程序如下:

复制代码
import java.util.*;

/**
 * This program demonstrates operations on linked lists.
 * @version 1.11 2012-01-26
 * @author Cay Horstmann
 */
public class LinkedListTest
{
   public static void main(String[] args)
   {
       
      List<String> a = new LinkedList<>();
      a.add("Amy");
      a.add("Carl");
      a.add("Erica");

      List<String> b = new LinkedList<>();
      b.add("Bob");
      b.add("Doug");
      b.add("Frances");
      b.add("Gloria");


      ListIterator<String> aIter = a.listIterator();
      Iterator<String> bIter = b.iterator();

      while (bIter.hasNext())
      {
         if (aIter.hasNext()) aIter.next();
         aIter.add(bIter.next());
      }

      System.out.println(a);

      

      bIter = b.iterator();
      while (bIter.hasNext())
      {
         bIter.next();

if (bIter.hasNext()) { bIter.next(); bIter.remove(); } } System.out.println(b); a.removeAll(b); System.out.println(a); } }
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程序运行结果如下:

测试程序3:

l 运行SetDemo程序,结合运行结果理解程序;

程序如下:

复制代码
import java.util.*;
public class SetDemo {
    public static void main(String[] argv) {
        HashSet h = new HashSet(); //也可以 Set h=new HashSet()
        h.add("One");
        h.add("Two");
        h.add("One"); 
        h.add("Three");
        Iterator it = h.iterator();
        while (it.hasNext()) {
             System.out.println(it.next());
        }
    }
}
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程序运行结果如下:

Elipse环境下调试教材367-368程序9-39-4,结合程序运行结果理解程序;了解TreeSet类的用途及常用API

9—3:

复制代码
import java.util.*;

/**
 * An item with a description and a part number.
 */
public class Item implements Comparable<Item>
{
   private String description;
   private int partNumber;

   /**
    * Constructs an item.
    * 
    * @param aDescription
    *           the item's description
    * @param aPartNumber
    *           the item's part number
    */
   public Item(String aDescription, int aPartNumber)
   {
      description = aDescription;
      partNumber = aPartNumber;
   }

   /**
    * Gets the description of this item.
    * 
    * @return the description
    */
   public String getDescription()
   {
      return description;
   }

   public String toString()
   {
      return "[description=" + description + ", partNumber=" + partNumber + "]";
   }

   public boolean equals(Object otherObject)
   {
      if (this == otherObject) return true;
      if (otherObject == null) return false;
      if (getClass() != otherObject.getClass()) return false;
      Item other = (Item) otherObject;
      return Objects.equals(description, other.description) && partNumber == other.partNumber;
   }

   public int hashCode()
   {
      return Objects.hash(description, partNumber);
   }

   public int compareTo(Item other)
   {
      int diff = Integer.compare(partNumber, other.partNumber);
      return diff != 0 ? diff : description.compareTo(other.description);
   }
}
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程序运行结果如下:

9—4:

复制代码
import java.util.*;

/**
 * This program sorts a set of item by comparing their descriptions.
 * @version 1.12 2015-06-21
 * @author Cay Horstmann
 */
public class TreeSetTest
{
   public static void main(String[] args)
   {
      SortedSet<Item> parts = new TreeSet<>();
      parts.add(new Item("Toaster", 1234));
      parts.add(new Item("Widget", 4562));
      parts.add(new Item("Modem", 9912));
      System.out.println(parts);

      NavigableSet<Item> sortByDescription = new TreeSet<>(
            Comparator.comparing(Item::getDescription));

      sortByDescription.addAll(parts);
      System.out.println(sortByDescription);
   }
}
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程序运行结果如图:

测试程序4:

使用JDK命令运行HashMapDemo程序,结合程序运行结果理解程序;

程序如下:

复制代码
import java.util.*;
public class HashMapDemo 
{
   public static void main(String[] argv) {
      HashMap h = new HashMap();
      // 哈希映射从公司名称到地址
      h.put("Adobe", "Mountain View, CA");
      h.put("IBM", "White Plains, NY");
      h.put("Sun", "Mountain View, CA");
      String queryString = "Adobe";
      String resultString = (String)h.get(queryString);
      System.out.println("They are located in: " +  resultString);
  }
}
复制代码

程序运行结果:

 Elipse环境下调试教材373页程序9-6,结合程序运行结果理解程序;

了解HashMapTreeMap两个类的用途及常用API

程序如下:

复制代码
import java.util.*;

/**
 * This program demonstrates the use of a map with key type String and value type Employee.
 * @version 1.12 2015-06-21
 * @author Cay Horstmann
 */
public class MapTest
{
   public static void main(String[] args)
   {
      Map<String, Employee> staff = new HashMap<>();
      staff.put("144-25-5464", new Employee("Amy Lee"));
      staff.put("567-24-2546", new Employee("Harry Hacker"));
      staff.put("157-62-7935", new Employee("Gary Cooper"));
      staff.put("456-62-5527", new Employee("Francesca Cruz"));


      System.out.println(staff);


      staff.remove("567-24-2546");


      staff.put("456-62-5527", new Employee("Francesca Miller"));

      System.out.println(staff.get("157-62-7935"));


      staff.forEach((k, v) -> 
         System.out.println("key=" + k + ", value=" + v));
   }
}

程序运行结果如下:

实验2:结对编程练习:

关于结对编程:以下图片是一个结对编程场景:两位学习伙伴坐在一起,面对着同一台显示器,使用着同一键盘,同一个鼠标,他们一起思考问题,一起分析问题,一起编写程序。

关于结对编程的阐述可参见以下链接:

http://www.cnblogs.com/xinz/archive/2011/08/07/2130332.html

http://en.wikipedia.org/wiki/Pair_programming

对于结对编程中代码设计规范的要求参考

http://www.cnblogs.com/xinz/archive/2011/11/20/2255971.html

以下实验,就让我们来体验一下结对编程的魅力。

确定本次实验结对编程合作伙伴:

各自运行合作伙伴实验九编程练习1,结合使用体验对所运行程序提出完善建议;

  1         import java.io.BufferedReader;
  2         import java.io.File;
  3         import java.io.FileInputStream;
  4         import java.io.FileNotFoundException;
  5         import java.io.IOException;
  6         import java.io.InputStreamReader;
  7         import java.util.ArrayList;
  8         import java.util.Arrays;
  9         import java.util.Collections;
 10         import java.util.Scanner;
 11 
 12 public class ee {
 13     private static ArrayList<Student> studentlist;
 14     public static void main(String[] args) {
 15 
 16                 studentlist = new ArrayList<>();
 17                 Scanner scanner = new Scanner(System.in);
 18                 File file = new File("F:\java\身份证号.txt");
 19                 try {
 20                     FileInputStream fis = new FileInputStream(file);
 21                     BufferedReader in = new BufferedReader(new InputStreamReader(fis));
 22                     String temp = null;
 23                     while ((temp = in.readLine()) != null) {
 24                         
 25                         Scanner linescanner = new Scanner(temp);
 26                         
 27                         linescanner.useDelimiter(" ");    
 28                         String name = linescanner.next();
 29                         String number = linescanner.next();
 30                         String sex = linescanner.next();
 31                         String age = linescanner.next();
 32                         String province =linescanner.nextLine();
 33                         Student student = new Student();
 34                         student.setName(name);
 35                         student.setnumber(number);
 36                         student.setsex(sex);
 37                         int a = Integer.parseInt(age);
 38                         student.setage(a);
 39                         student.setprovince(province);
 40                         studentlist.add(student);
 41 
 42                     }
 43                 } catch (FileNotFoundException e) {
 44                     System.out.println("找不到学生的信息文件");
 45                     e.printStackTrace();
 46                 } catch (IOException e) {
 47                     System.out.println("学生信息文件读取错误");
 48                     e.printStackTrace();
 49                 }
 50                 boolean isTrue = true;
 51                 while (isTrue) {
 52                     System.out.println("选择你的操作, ");
 53                     System.out.println("1.字典排序  ");
 54                     System.out.println("2.输出年龄最大和年龄最小的人  ");
 55                     System.out.println("3.寻找同乡  ");
 56                     System.out.println("4.寻找年龄相近的人  ");
 57                     System.out.println("5.退出 ");
 58                     String m = scanner.next();
 59                     switch (m) {
 60                     case "1":
 61                         Collections.sort(studentlist);              
 62                         System.out.println(studentlist.toString());
 63                         break;
 64                     case "2":
 65                          int max=0,min=100;
 66                          int j,k1 = 0,k2=0;
 67                          for(int i=1;i<studentlist.size();i++)
 68                          {
 69                              j=studentlist.get(i).getage();
 70                          if(j>max)
 71                          {
 72                              max=j; 
 73                              k1=i;
 74                          }
 75                          if(j<min)
 76                          {
 77                            min=j; 
 78                            k2=i;
 79                          }
 80                          
 81                          }  
 82                          System.out.println("年龄最大:"+studentlist.get(k1));
 83                          System.out.println("年龄最小:"+studentlist.get(k2));
 84                         break;
 85                     case "3":
 86                          System.out.println("地址?");
 87                          String find = scanner.next();        
 88                          String place=find.substring(0,3);
 89                          for (int i = 0; i <studentlist.size(); i++) 
 90                          {
 91                              if(studentlist.get(i).getprovince().substring(1,4).equals(place)) 
 92                                  System.out.println("同乡"+studentlist.get(i));
 93                          }             
 94                          break;
 95                          
 96                     case "4":
 97                         System.out.println("年龄:");
 98                         int yourage = scanner.nextInt();
 99                         int near=agenear(yourage);
100                         int value=yourage-studentlist.get(near).getage();
101                         System.out.println(""+studentlist.get(near));
102                         break;
103                     case "5 ":
104                         isTrue = false;
105                         System.out.println("退出程序!");
106                         break;
107                         default:
108                         System.out.println("输入有误");
109 
110                     }
111                 }
112             }
113                 public static int agenear(int age) {      
114                 int j=0,min=53,value=0,ok=0;
115                  for (int i = 0; i < studentlist.size(); i++)
116                  {
117                      value=studentlist.get(i).getage()-age;
118                      if(value<0) value=-value; 
119                      if (value<min) 
120                      {
121                         min=value;
122                          ok=i;
123                      } 
124                   }    
125                  return ok;         
126               }
127         }
 1     public class Student implements Comparable<Student> {
 2 
 3     private String name;
 4     private String number ;
 5     private String sex ;
 6     private int age;
 7     private String province;
 8    
 9     public String getName() {
10         return name;
11     }
12     public void setName(String name) {
13         this.name = name;
14     }
15     public String getnumber() {
16         return number;
17     }
18     public void setnumber(String number) {
19         this.number = number;
20     }
21     public String getsex() {
22         return sex ;
23     }
24     public void setsex(String sex ) {
25         this.sex =sex ;
26     }
27     public int getage() {
28 
29         return age;
30         }
31         public void setage(int age) {
32             // int a = Integer.parseInt(age);
33         this.age= age;
34         }
35 
36     public String getprovince() {
37         return province;
38     }
39     public void setprovince(String province) {
40         this.province=province ;
41     }
42 
43     public int compareTo(Student o) {
44        return this.name.compareTo(o.getName());
45     }
46 
47     public String toString() {
48         return  name+"	"+sex+"	"+age+"	"+number+"	"+province+"
";
49     }    
50 }

  1 package ww;
  2 import java.io.BufferedReader;
  3 import java.io.File;
  4 import java.io.FileInputStream;
  5 import java.io.FileNotFoundException;
  6 import java.io.IOException;
  7 import java.io.InputStreamReader;
  8 import java.util.ArrayList;
  9 import java.util.Arrays;
 10 import java.util.Collections;
 11 import java.util.Scanner;
 12 
 13 
 14 public class hhh{
 15 
 16 private static ArrayList<Person> Personlist1;
 17 public static void main(String[] args) {
 18  
 19   Personlist1 = new ArrayList<>();
 20  
 21   Scanner scanner = new Scanner(System.in);
 22   File file = new File("E:\面向对象程序设计Java\实验\实验六\身份证号.txt");
 23 
 24         try {
 25              FileInputStream F = new FileInputStream(file);
 26              BufferedReader in = new BufferedReader(new InputStreamReader(F));
 27              String temp = null;
 28              while ((temp = in.readLine()) != null) {
 29                 
 30                 Scanner linescanner = new Scanner(temp);
 31                 
 32                 linescanner.useDelimiter(" ");    
 33                 String name = linescanner.next();
 34                 String id = linescanner.next();
 35                 String sex = linescanner.next();
 36                 String age = linescanner.next();
 37                 String place =linescanner.nextLine();
 38                 Person Person = new Person();
 39                 Person.setname(name);
 40                 Person.setid(id);
 41                 Person.setsex(sex);
 42                 int a = Integer.parseInt(age);
 43                 Person.setage(a);
 44                 Person.setbirthplace(place);
 45                 Personlist1.add(Person);
 46 
 47             }
 48         } catch (FileNotFoundException e) {
 49             System.out.println("查找不到信息");
 50             e.printStackTrace();
 51         } catch (IOException e) {
 52             System.out.println("信息读取有误");
 53             e.printStackTrace();
 54         }
 55         boolean isTrue = true;
 56         while (isTrue) {
 57             System.out.println("******************************************");
 58             System.out.println("1:按姓名字典顺序输出信息;");
 59             System.out.println("2:查询最大年龄与最小年龄人员信息;");
 60             System.out.println("3:按省份找你的同乡;");
 61             System.out.println("4:输入你的年龄,查询年龄与你最近人的信息;");
 62             System.out.println("5:退出");
 63             System.out.println("******************************************");
 64             int type = scanner.nextInt();
 65             switch (type) {
 66             case 1:
 67                 Collections.sort(Personlist1);
 68                 System.out.println(Personlist1.toString());
 69                 break;
 70             case 2:
 71                 
 72                 int max=0,min=100;int j,k1 = 0,k2=0;
 73                 for(int i=1;i<Personlist1.size();i++)
 74                 {
 75                     j=Personlist1.get(i).getage();
 76                    if(j>max)
 77                    {
 78                        max=j; 
 79                        k1=i;
 80                    }
 81                    if(j<min)
 82                    {
 83                        min=j; 
 84                        k2=i;
 85                    }
 86 
 87                 }  
 88                 System.out.println("年龄最大:"+Personlist1.get(k1));
 89                 System.out.println("年龄最小:"+Personlist1.get(k2));
 90                 break;
 91             case 3:
 92                 System.out.println("place?");
 93                 String find = scanner.next();        
 94                 String place=find.substring(0,3);
 95                 String place2=find.substring(0,3);
 96                 for (int i = 0; i <Personlist1.size(); i++) 
 97                 {
 98                     if(Personlist1.get(i).getbirthplace().substring(1,4).equals(place)) 
 99                     {
100                         System.out.println("你的同乡:"+Personlist1.get(i));
101                     }
102                 } 
103 
104                 break;
105             case 4:
106                 System.out.println("年龄:");
107                 int yourage = scanner.nextInt();
108                 int close=ageclose(yourage);
109                 int d_value=yourage-Personlist1.get(close).getage();
110                 System.out.println(""+Personlist1.get(close));
111           
112                 break;
113             case 5:
114            isTrue = false;
115            System.out.println("再见!");
116                 break;
117             default:
118                 System.out.println("输入有误");
119             }
120         }
121     }
122     public static int ageclose(int age) {
123            int m=0;
124         int    max=53;
125         int d_value=0;
126         int k=0;
127         for (int i = 0; i < Personlist1.size(); i++)
128         {
129             d_value=Personlist1.get(i).getage()-age;
130             if(d_value<0) d_value=-d_value; 
131             if (d_value<max) 
132             {
133                max=d_value;
134                k=i;
135             }
136 
137          }    return k;
138         
139      }
140 
 1 package Second;
 2 
 3 
 4 public class Person implements Comparable<Person> {
5 6
private String name; 7 private String id; 8 private int age; 9 private String sex; 10 private String birthplace;
11
12 13 public String getname() { 14 return name; 15 } 16 public void setname(String name) { 17 this.name = name; 18 } 19 public String getid() { 20 return id; 21 } 22 public void setid(String id) { 23 this.id= id; 24 } 25 public int getage() { 26 27 return age; 28 } 29 public void setage(int age) { 30 //int a = Integer.parseInt(age); 31 this.age= age; 32 } 33 public String getsex() { 34 return sex; 35 } 36 public void setsex(String sex) { 37 this.sex= sex; 38 } 39 public String getbirthplace() { 40 return birthplace; 41 } 42 public void setbirthplace(String birthplace) { 43 this.birthplace= birthplace; 44 } 45 46 public int compareTo(Person o) { 47 return this.name.compareTo(o.getname()); 48 49 } 50 51 public String toString() { 52 return name+" "+sex+" "+age+" "+id+" ";

结合使用体验对所运行程序提出完善建议;

  实验九:
  1.文件输出字体格式不一致,在整体美观上尚可修改。
  2.编程过程存在变量使用混乱不清的问题。

各自运行合作伙伴实验十编程练习2,

  1 package Zhao;
  2 
  3 import java.io.FileNotFoundException;
  4 import java.io.PrintWriter;
  5 import java.util.Scanner;
  6 
  7 //import org.w3c.dom.css.Counter;
  8 
  9 
 10 public class Main{
 11     public static void main(String[] args) {
 12 
 13         Scanner in = new Scanner(System.in);
 14         counter Counter=new  counter();
 15         PrintWriter output = null;
 16         try {
 17             output = new PrintWriter("result.txt");
 18         } catch (Exception e) {
 19             //e.printStackTrace();
 20         }
 21         int sum = 0;
 22 
 23         for (int i = 1; i <=10; i++) {
 24             int a = (int) Math.round(Math.random() * 100);
 25             int b = (int) Math.round(Math.random() * 100);
 26             int type = (int) Math.round(Math.random() * 4);
 27            
 28             
 29            switch(type)
 30            {
 31            case 1:
 32                
 33                System.out.println(i+": "+a+"/"+b+"=");
 34                while(b== 0&& a%b!=0)
 35                {  
 36                    b = (int) Math.round(Math.random() * 100); 
 37                    a = (int) Math.round(Math.random() * 100);
 38                    }   
 39                
 40                int c = in.nextInt();
 41                output.println(a+"/"+b+"="+c);
 42                if (c == Counter.Chu(a, b)) 
 43                {
 44                    sum += 10;
 45                    System.out.println("恭喜答案正确!");
 46                }
 47                else {
 48                    System.out.println("答案错误!");
 49                } 
 50                    break;
 51            
 52            case 2:
 53                System.out.println(i+": "+a+"*"+b+"=");
 54                int c1 = in.nextInt();
 55                output.println(a+"*"+b+"="+c1);
 56                if (c1 == Counter.Cheng(a, b)) {
 57                    sum += 10;
 58                    System.out.println("恭喜答案正确!");
 59                }
 60                else {
 61                    System.out.println("答案错误!");
 62                }
 63                break;
 64            case 3:
 65                System.out.println(i+": "+a+"+"+b+"=");
 66                int c2 = in.nextInt();
 67                output.println(a+"+"+b+"="+c2);
 68               
 69                if (c2 ==  Counter.Jia(a, b)) {
 70                    sum += 10;
 71                    System.out.println("恭喜答案正确!");
 72                }
 73                else {
 74                    System.out.println("答案错误!");
 75                }
 76                break ;
 77                
 78                
 79            case 4:
 80                
 81                while (a < b) {
 82                    int x=0;
 83                    x=b;
 84                    b=a;
 85                    a=x;
 86                }
 87                System.out.println(i+": "+a+"-"+b+"=");
 88                int c3 = in.nextInt();
 89                output.println(a+"-"+b+"="+c3);
 90                if (c3 ==  Counter.Jian(a, b)) 
 91                {
 92                    sum += 10;
 93                    System.out.println("恭喜答案正确!");
 94                }
 95                else {
 96                    System.out.println("答案错误!");
 97                }
 98                break ;
 99 
100              } 
101     
102           }
103         System.out.println("成绩"+sum);
104         output.println("成绩:"+sum);
105         output.close();
106          
107     }
108 }
 1 package Zhao;
 2 
 3 
 4 public class counter<T>{
 5        private T a;
 6        private T b;
 7        
 8        public counter(T a, T b) {
 9             this.a = a;
10             this.b = b;
11         }
12 
13                public counter() {
14         // TODO Auto-generated constructor stub
15     }
16 
17             public int  Jia(int a,int b)
18                {
19                    return a+b;
20                }
21                public int  Jian(int a,int b)
22                {
23                    return a-b;
24                        
25                  
26                }
27                public int   Cheng(int a,int b)
28                {
29                    return a*b;
30                }
31                public int   Chu(int a,int b)
32                {
33                    if (b!= 0 && a%b==0)
34                        return a / b;
35                    else
36                        return 0;  
37                    
38                }
39 
40                
41        }

 

   结合使用体验对所运行程序提出完善建议;

   实验十
   1.没有全面考虑小学生的实际状况:减法算法结果可能出现负数的情况,以及除法的运算结果直接取整输出,都不符合小学生的学习范围;
   2.编程过程中,关于变量的使用混乱问题;
   3.结果没有输出到文件中;

采用结对编程方式,与学习伙伴合作完成实验九编程练习1;

 1 package First;
  2 import java.io.BufferedReader;
  3 import java.io.File;
  4 import java.io.FileInputStream;
  5 import java.io.FileNotFoundException;
  6 import java.io.IOException;
  7 import java.io.InputStreamReader;
  8 import java.util.ArrayList;
  9 import java.util.Arrays;
 10 import java.util.Collections;
 11 import java.util.Scanner;
 12 
 13 
 14 public class Search{
 15 
 16 private static ArrayList<Person> Personlist1;
 17 public static void main(String[] args) {
 18  
 19   Personlist1 = new ArrayList<>();
 20  
 21   Scanner scanner = new Scanner(System.in);
 22   File file = new File("E:\面向对象程序设计Java\实验\实验六\身份证号.txt");
 23 
 24         try {
 25              FileInputStream F = new FileInputStream(file);
 26              BufferedReader in = new BufferedReader(new InputStreamReader(F));
 27              String temp = null;
 28              while ((temp = in.readLine()) != null) {
 29                 
 30                 Scanner linescanner = new Scanner(temp);
 31                 
 32                 linescanner.useDelimiter(" ");    
 33                 String name = linescanner.next();
 34                 String id = linescanner.next();
 35                 String sex = linescanner.next();
 36                 String age = linescanner.next();
 37                 String place =linescanner.nextLine();
 38                 Person Person = new Person();
 39                 Person.setname(name);
 40                 Person.setid(id);
 41                 Person.setsex(sex);
 42                 int a = Integer.parseInt(age);
 43                 Person.setage(a);
 44                 Person.setbirthplace(place);
 45                 Personlist1.add(Person);
 46 
 47             }
 48         } catch (FileNotFoundException e) {
 49             System.out.println("查找不到信息");
 50             e.printStackTrace();
 51         } catch (IOException e) {
 52             System.out.println("信息读取有误");
 53             e.printStackTrace();
 54         }
 55         boolean isTrue = true;
 56         while (isTrue) {
 57             System.out.println("******************************************");
 58             System.out.println("1:按姓名字典顺序输出信息;");
 59             System.out.println("2:查询最大年龄与最小年龄人员信息;");
 60             System.out.println("3:按省份找你的同乡;");
 61             System.out.println("4:输入你的年龄,查询年龄与你最近人的信息;");
 62             System.out.println("5:退出");
 63             System.out.println("******************************************");
 64             int type = scanner.nextInt();
 65             switch (type) {
 66             case 1:
 67                 Collections.sort(Personlist1);
 68                 System.out.println(Personlist1.toString());
 69                 break;
 70             case 2:
 71                 
 72                 int max=0,min=100;int j,k1 = 0,k2=0;
 73                 for(int i=1;i<Personlist1.size();i++)
 74                 {
 75                     j=Personlist1.get(i).getage();
 76                    if(j>max)
 77                    {
 78                        max=j; 
 79                        k1=i;
 80                    }
 81                    if(j<min)
 82                    {
 83                        min=j; 
 84                        k2=i;
 85                    }
 86 
 87                 }  
 88                 System.out.println("年龄最大:"+Personlist1.get(k1));
 89                 System.out.println("年龄最小:"+Personlist1.get(k2));
 90                 break;
 91             case 3:
 92                 System.out.println("place?");
 93                 String find = scanner.next();        
 94                 String place=find.substring(0,3);
 95                 String place2=find.substring(0,3);
 96                 for (int i = 0; i <Personlist1.size(); i++) 
 97                 {
 98                     if(Personlist1.get(i).getbirthplace().substring(1,4).equals(place)) 
 99                     {
100                         System.out.println("你的同乡:"+Personlist1.get(i));
101                     }
102                 } 
103 
104                 break;
105             case 4:
106                 System.out.println("年龄:");
107                 int yourage = scanner.nextInt();
108                 int close=ageclose(yourage);
109                 int d_value=yourage-Personlist1.get(close).getage();
110                 System.out.println(""+Personlist1.get(close));
111           
112                 break;
113             case 5:
114            isTrue = false;
115            System.out.println("再见!");
116                 break;
117             default:
118                 System.out.println("输入有误");
119             }
120         }
121     }
122     public static int ageclose(int age) {
123            int m=0;
124         int    max=53;
125         int d_value=0;
126         int k=0;
127         for (int i = 0; i < Personlist1.size(); i++)
128         {
129             d_value=Personlist1.get(i).getage()-age;
130             if(d_value<0) d_value=-d_value; 
131             if (d_value<max) 
132             {
133                max=d_value;
134                k=i;
135             }
136 
137          }    return k;
138         
139      }
140 }
 1 package FFF;
 2 
 3 
 4 public class Person implements Comparable<Person> {
 5   
6
7 private String name; 8 private String id; 9 private int age; 10 private String sex; 11 private String birthplace; 12 13 public String getname() { 14 return name; 15 } 16 public void setname(String name) { 17 this.name = name; 18 } 19 public String getid() { 20 return id; 21 } 22 public void setid(String id) { 23 this.id= id; 24 } 25 public int getage() { 26 27 return age; 28 } 29 public void setage(int age) { 30 //int a = Integer.parseInt(age); 31 this.age= age; 32 } 33 public String getsex() { 34 return sex; 35 } 36 public void setsex(String sex) { 37 this.sex= sex; 38 } 39 public String getbirthplace() { 40 return birthplace; 41 } 42 public void setbirthplace(String birthplace) { 43 this.birthplace= birthplace; 44 } 45 46 public int compareTo(Person o) { 47 return this.name.compareTo(o.getname()); 48 49 } 50 51 public String toString() { 52 return name+" "+sex+" "+age+" "+id+" ";

采用结对编程方式,与学习伙伴合作完成实验十编程练习2。

 1 package PP;
 2 
 3 import java.io.FileNotFoundException;
 4 import java.io.IOException;
 5 import java.io.PrintWriter;
 6 import java.util.Scanner;
 7 public class Main {
 8 
 9     public static void main(String[] args) {
10                 Scanner in = new Scanner(System.in);
11                 counter min=new counter();
12                 PrintWriter out = null;
13                 try {
14                     out = new PrintWriter("result.txt");
15                     int sum = 0;
16                     for (int i = 1; i <=10; i++) {
17                         int a = (int) Math.round(Math.random() * 100);
18                         int b = (int) Math.round(Math.random() * 100);
19                         int menu = (int) Math.round(Math.random() * 3);
20                         switch (menu) {
21                         case 0:
22                             System.out.println(i+":"+a + "+" + b + "=");
23                             int c1 = in.nextInt();
24                             out.println(a + "+" + b + "=" + c1);
25                             if (c1 == (a + b)) {
26                                 sum += 10;
27                                 System.out.println("恭喜答案正确");
28                             } else {
29                                 System.out.println("抱歉,答案错误");
30                             }
31                             break;
32                         case 1:
33                             while (a < b) {
34                                 b = (int) Math.round(Math.random() * 100);
35                             }
36                             System.out.println(i+":"+a + "-" + b + "=");
37                             int c2 = in.nextInt();
38                             out.println(a + "-" + b + "=" + c2);
39                             if (c2 == (a - b)) {
40                                 sum += 10;
41                                 System.out.println("恭喜答案正确");
42                             } else {
43                                 System.out.println("抱歉,答案错误");
44                             }
45 
46                             break;
47                         case 2:
48                             System.out.println(i+":"+a + "*" + b + "=");
49                             int c3 = in.nextInt();
50                             out.println(a + "*" + b + "=" + c3);
51                             if (c3 == a * b) {
52                                 sum += 10;
53                                 System.out.println("恭喜答案正确");
54                             } else {
55                                 System.out.println("抱歉,答案错误");
56                             }
57 
58                             break;
59                         case 3:
60                              while(b == 0){
61                                     b = (int) Math.round(Math.random() * 100);
62                                 }
63                                 while(a % b != 0){
64                                     a = (int) Math.round(Math.random() * 100);
65                                     
66                                 }
67                             System.out.println(i+":"+a + "/" + b + "=");
68                             int c4 = in.nextInt();
69                             if (c4 == a / b) {
70                                 sum += 10;
71                                 System.out.println("恭喜,答案正确");
72                             } else {
73                                 System.out.println("抱歉,答案错误");
74                             }
75 
76                             break;
77                         }
78                     }
79                     System.out.println("你的得分为" + sum);
80                     out.println("你的得分为" + sum);
81                     out.close();
82                 } catch (FileNotFoundException e) {
83                     e.printStackTrace();
84                 }
85             }
86         }
 1 package PP;
 2 
 3 public class counter<T> {
 4     private T a;
 5     private T b;
 6     public counter() {
 7         a=null;
 8         b=null;
 9     }
10     public counter(T a,T b) {
11         this.a=a;
12         this.b=b;
13     }
14     public int count1(int a,int b) {
15         return a+b;
16     }
17     public int count2(int a,int b) {
18         return a-b;
19     }
20     public int count3(int a,int b) {
21         return a*b;
22     }
23     public int count4(int a,int b) {
24         return a/b;
25     }
26 }

实验总结:

通过本周学习,我进一步复习了一些有关数据结构的知识,另外初步了解了java集合类,也了解了Vector类,Stack类以及Hashtable类。除此以外,此次实验第一次采用结对编程的方法,通过和合作伙伴互相运行程序,相互讨论交流,从中学到了很多东西。希望以后多采取这种方法,在合作中互相学习进步。

原文地址:https://www.cnblogs.com/zd0421/p/9942225.html