201871010119-帖佼佼《面向对象程序设计（java）》第八周学习总结

package interfaces;

public class Employee implements Comparable<Employee>   //接口的定义，Comparable是内置接口
{
   private String name;     //私有变量的定义
   private double salary; 

   public Employee(String name, double salary)    //Employee构造器
   {
      this.name = name;
      this.salary = salary;
   }

   public String getName()      //getName方法访问器
   {
      return name;
   }

   public double getSalary()     //getSalary方法访问器
   {
      return salary;
   }

   public void raiseSalary(double byPercent)     //声明方法
   {
      double raise = salary * byPercent / 100;
      salary += raise;
   }

   /**
    * Compares employees by salary
    * @param other another Employee object
    * @return a negative value if this employee has a lower salary than
    * otherObject, 0 if the salaries are the same, a positive value otherwise
    */
   public int compareTo(Employee other)    //按工资输出
   { 
      return Double.compare(salary, other.salary);     
   }
}

package interfaces;

import java.util.*;

/**
 * This program demonstrates the use of the Comparable interface.
 * @version 1.30 2004-02-27
 * @author Cay Horstmann
 */
public class EmployeeSortTest    //EmployeeSortTest类
{
   public static void main(String[] args)
   {
	  Employee[] staff = new Employee[3];   //Employee对象数组的创建   

      staff[0] = new Employee("Harry Hacker", 35000);
      staff[1] = new Employee("Carl Cracker", 75000);
      staff[2] = new Employee("Tony Tester", 38000);

      Arrays.sort(staff);    //数组排序方法

      // print out information about all Employee objects
      for (Employee e : staff)     //调用getNname()方法以及getSalary()方法输出所有雇员的信息
         System.out.println("name=" + e.getName() + ",salary=" + e.getSalary());
   }
}

interface  A    //A接口
{
  double g=9.8;    
  void show( );    
}
class C implements A       //定义C继承接口A
{
  public void show( )
  {
	  System.out.println("g="+g);    //将g的值输出在控制台上
  }
}

class InterfaceTest     //InterfaceTest类的定义
{
  public static void main(String[ ] args)
  {
       A a=new C( );   
       a.show( );
       System.out.println("g="+C.g);    //输出g的值在控制台上
  }
}

package timer;     

/**
   @version 1.02 2017-12-14
   @author Cay Horstmann
*/

import java.awt.*;
import java.awt.event.*;
import java.time.*;
import javax.swing.*;

public class TimerTest
{  
   public static void main(String[] args)
   {  
      ActionListener listener = new TimePrinter();    //构造这个类的一个对象，并将它传递给Timer构造器
      //ActionListener接口对象，创建实现类接口的对象
      // construct a timer that calls the listener
      // once every second
      Timer timer = new Timer(1000, listener);    //创建定时器类对象timer
      timer.start();      //启动定时器

      // keep program running until the user selects "OK"
      JOptionPane.showMessageDialog(null, "Quit program?");    //启动程序后，将会立即弹出一个包含"Quit program?"字样的对话框
      System.exit(0);
   }
}

class TimePrinter implements ActionListener   //接口
{  
   public void actionPerformed(ActionEvent event)   //actionPerformed方法的ActionEvent参数，提供了事件的相关信息
   {  
      System.out.println("At the tone, the time is " 
         + Instant.ofEpochMilli(event.getWhen()));    //每隔10秒，这条信息就会输出一次，然后响一声铃
      Toolkit.getDefaultToolkit().beep();    //返回Toolkit，调用getDefaultToolkit()方法，获得默认的工具箱
   }
}

package clone;

import java.util.Date;
import java.util.GregorianCalendar;

public class Employee implements  Cloneable    //浅层拷贝和会深层拷贝的使用
{
   private String name;     //三个私有变量的定义
   private double salary;
   private Date hireDay;

   public Employee(String name, double salary)    //Employee构造器
   {
      this.name = name;
      this.salary = salary;
      hireDay = new Date();
   }

   public Employee clone() throws CloneNotSupportedException   
   //声明异常，在一个对象上调用clone，但这个 对象的类并没有实现Cloneable的接口，然后Object类的clone方法就会抛出一个 CloneNotSupportedException。
   {
      // call Object.clone()
      Employee cloned = (Employee) super.clone();

      // clone mutable fields
      cloned.hireDay = (Date) hireDay.clone();

      return cloned;
   }

   /**
    * Set the hire day to a given date. 
    * @param year the year of the hire day
    * @param month the month of the hire day
    * @param day the day of the hire day
    */
   public void setHireDay(int year, int month, int day)      //
   {
      Date newHireDay = new GregorianCalendar(year, month - 1, day).getTime();
      
      // example of instance field mutation
      hireDay.setTime(newHireDay.getTime());
   }

   public void raiseSalary(double byPercent)       
   {
      double raise = salary * byPercent / 100;
      salary += raise;
   }

   public String toString()
   {
      return "Employee[name=" + name + ",salary=" + salary + ",hireDay=" + hireDay + "]";
   }
}

package clone;

/**
 * This program demonstrates cloning.
 * @version 1.11 2018-03-16
 * @author Cay Horstmann
 */
public class CloneTest
{
   public static void main(String[] args) throws CloneNotSupportedException
   {
      Employee original = new Employee("John Q. Public", 50000);
      original.setHireDay(2000, 1, 1);
      Employee copy = original.clone();     
      //原始变量与拷贝变量引用统一个对象，这样，使用Object类的Clone对象，改变一个对象所引用的对象就不会影响另一个对象
      copy.raiseSalary(10);     //copy会增长10%的薪资，但是original不会变
      copy.setHireDay(2002, 12, 31);
      System.out.println("original=" + original);
      System.out.println("copy=" + copy);
   }
}

package lambda;

import java.util.*;

import javax.swing.*;
import javax.swing.Timer;

/**
 * This program demonstrates the use of lambda expressions.
 * @version 1.0 2015-05-12
 * @author Cay Horstmann
 */
public class LambdaTest    //LambdaTest类
{
   public static void main(String[] args)
   {
      String[] planets = new String[] { "Mercury", "Venus", "Earth", "Mars", 
         "Jupiter", "Saturn", "Uranus", "Neptune" };    //创建一个String类数组对象
      System.out.println(Arrays.toString(planets));         //调用Arrays的toString方法，然后将planets输出在控制台上
      System.out.println("Sorted in dictionary order:");
      Arrays.sort(planets);				//数组排序
      System.out.println(Arrays.toString(planets));
      System.out.println("Sorted by length:");
      Arrays.sort(planets, (first, second) -> first.length() - second.length()); //可以推导出first以及second的类型
      System.out.println(Arrays.toString(planets));
            
      Timer timer = new Timer(1000, event ->       //如果方法只有一个参数，则这个参数的类型可以推导出
         System.out.println("The time is " + new Date()));
      timer.start();   //计时器开始
         
      // keep program running until user selects "OK"
      JOptionPane.showMessageDialog(null, "Quit program?");
      System.exit(0);         
   }
}

package innerClass;

import java.awt.*;
import java.awt.event.*;
import java.time.*;

import javax.swing.*;

/**
 * This program demonstrates the use of inner classes.
 * @version 1.11 2017-12-14
 * @author Cay Horstmann
 */
public class InnerClassTest
{
   public static void main(String[] args)
   {
      TalkingClock clock = new TalkingClock(1000, true);      //创建TalkingClock对象，
      clock.start();         

      // keep program running until the user selects "OK"
      JOptionPane.showMessageDialog(null, "Quit program?");     //当程序开始运行的时候立即出现写有“Quit program”的对话框
      System.exit(0);
   }
}

/**
 * A clock that prints the time in regular intervals.
 */
class TalkingClock           //抽象一个TalkingClock类
{
   private int interval;       //构造语音时钟时所需要的两个参数：发布通告的间隔以及开关铃声的标志
   private boolean beep;

   /**
    * Constructs a talking clock
    * @param interval the interval between messages (in milliseconds)
    * @param beep true if the clock should beep
    */
   public TalkingClock(int interval, boolean beep)             //TalkingClock构造器
   {
      this.interval = interval;
      this.beep = beep;
   }

   /**
    * Starts the clock.
    */
   public void start()     //方法声明
   {
      TimePrinter listener = new TimePrinter();           //创建一个TimePrinter对象，其在TalkingClock的内部
      Timer timer = new Timer(interval, listener);
      timer.start();      //启动
   }

   public class TimePrinter implements ActionListener     //将TimePrinter类声明为实现ActionListener接口
   {
      public void actionPerformed(ActionEvent event)      //actionPerformed方法在发出铃声之前检查了beep标志
      {
         System.out.println("At the tone, the time is " 
            + Instant.ofEpochMilli(event.getWhen()));
         if (beep) Toolkit.getDefaultToolkit().beep();
      }
   }
}

package anonymousInnerClass;

import java.awt.*;
import java.awt.event.*;
import java.time.*;

import javax.swing.*;

/**
 * This program demonstrates anonymous inner classes.
 * @version 1.12 2017-12-14
 * @author Cay Horstmann
 */
public class AnonymousInnerClassTest
{
   public static void main(String[] args)
   {
      TalkingClock clock = new TalkingClock();           //创建一个TalkingClock对象
      clock.start(1000, true);     

      // keep program running until the user selects "OK"
      JOptionPane.showMessageDialog(null, "Quit program?");
      System.exit(0);
   }
}

/**
 * A clock that prints the time in regular intervals.
 */
class TalkingClock           //抽象一个TalkingClock类
{
   /**
    * Starts the clock.
    * @param interval the interval between messages (in milliseconds)
    * @param beep true if the clock should beep
    */
   public void start(int interval, boolean beep)    //方法声明
   {
      ActionListener listener = new ActionListener()    //创建一个实现ActionListener接口的类的新对象，
         {
            public void actionPerformed(ActionEvent event)  //需要实现的方法定义在ActionListener括号{}内 
            {
               System.out.println("At the tone, the time is " 
                  + Instant.ofEpochMilli(event.getWhen()));
               if (beep) Toolkit.getDefaultToolkit().beep();    //在响铃之前actionPerformed检查了beep
            }
         };
      Timer timer = new Timer(interval, listener);            //创建一个Timer类对象
      timer.start();        //启动计时器
   }
}

package staticInnerClass;

/**
 * This program demonstrates the use of static inner classes.
 * @version 1.02 2015-05-12
 * @author Cay Horstmann
 */
public class StaticInnerClassTest
{
   public static void main(String[] args)
   {
      double[] values = new double[20];    //定义一个double对象数组
      for (int i = 0; i < values.length; i++)
         values[i] = 100 * Math.random();
      ArrayAlg.Pair p = ArrayAlg.minmax(values);   
      System.out.println("min = " + p.getFirst());   //这个方法的调用者可以使用getFirst和getSecond方法获得答案
      System.out.println("max = " + p.getSecond());
   }
}

class ArrayAlg    //抽象一个ArrayAlg类
{
   /**
    * A pair of floating-point numbers
    */
   public static class Pair     //在Pair对象中不需要引用任何其他的对象，所以将这个内部类声明为static
   {
      private double first;    //定义两个私有变量
      private double second;

      /**
       * Constructs a pair from two floating-point numbers
       * @param f the first number
       * @param s the second number
       */
      public Pair(double f, double s)       //Pair构造器
      {
         first = f;
         second = s;
      }

      /**
       * Returns the first number of the pair
       * @return the first number
       */
      public double getFirst()  //getFirst方法声明
      {
         return first;
      }

      /**
       * Returns the second number of the pair
       * @return the second number
       */
      public double getSecond()       //getSecond方法声明
      {
         return second;
      }
   }

   /**
    * Computes both the minimum and the maximum of an array
    * @param values an array of floating-point numbers
    * @return a pair whose first element is the minimum and whose second element
    * is the maximum
    */
   public static Pair minmax(double[] values) 
   //必须使用静态内部类，因为内部类对象是在静态方法中定义的，如果没有将Pair声明为static，编译器会报错，没有可用的隐式ArrayAlg类型对象初始化内部对象    
   {
      double min = Double.POSITIVE_INFINITY;
      double max = Double.NEGATIVE_INFINITY;
      for (double v : values)
      {
         if (min > v) min = v;
         if (max < v) max = v;
      }
      return new Pair(min, max);   //minmax必须返回返回一个Pair类型的对象
   }
}

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Scanner;

public class IDTest{
    private static ArrayList<Student> studentlist;     
    public static void main(String[] args) {
        studentlist = new ArrayList<>();
        Scanner scanner = new Scanner(System.in);
        File file = new File("D:\\java\\身份证号.txt");     //将文件引入
        
        try {
            FileInputStream fis = new FileInputStream(file);
            BufferedReader in = new BufferedReader(new InputStreamReader(fis));
            String temp = null;
            while ((temp = in.readLine()) != null) {
                
                Scanner linescanner = new Scanner(temp);
                
                linescanner.useDelimiter(" ");    
                String name = linescanner.next();
                String number = linescanner.next();
                String sex = linescanner.next();
                String age = linescanner.next();
                String province =linescanner.nextLine();
                Student student = new Student();
                student.setName(name);
                student.setnumber(number);
                student.setsex(sex);
                int a = Integer.parseInt(age);
                student.setage(a);
                student.setprovince(province);
                studentlist.add(student);

            }
        } catch (FileNotFoundException e) {
            System.out.println("学生信息文件找不到");
            e.printStackTrace();
        } catch (IOException e) {
            System.out.println("学生信息文件读取错误");
            e.printStackTrace();
        }
        boolean isTrue = true;
        while (isTrue) {
        	System.out.println("1:按姓名字典序输出人员信息；");
            System.out.println("2:查询最大年龄与最小年龄人员信息；");
            System.out.println("3.输入你的年龄，查询身份证号.txt中年龄与你最近人的姓名、身份证号、年龄、性别和出生地");
            System.out.println("4：按省份找你的同乡；");
            System.out.println("5：退出");
            String m = scanner.next();
            switch (m) {
            case "1":
                Collections.sort(studentlist);  
                System.out.println("排序后的结果为：" + "\n");
                System.out.println(studentlist.toString());
                break;
            case "2":
                 int max=0,min=100;
                 int j,k1 = 0,k2=0;
                 for(int i=1;i<studentlist.size();i++)
                 {
                     j=studentlist.get(i).getage();
                 if(j>max)
                 {
                     max=j; 
                     k1=i;
                 }
                 if(j<min)
                 {
                   min=j; 
                   k2=i;
                 }
                 
                 }  
                 System.out.println("Max  age："+studentlist.get(k1));
                 System.out.println("Min  age："+studentlist.get(k2));
                break;
            case "3":
                System.out.println("age：");
                int yourage = scanner.nextInt();
                int near=agenear(yourage);
                int value=yourage-studentlist.get(near).getage();
                System.out.println("年龄与你最近的人的姓名、身份证号、年龄、性别和出生地为：" + "\n");
                System.out.println(""+studentlist.get(near));
                break;
            case "4":
                System.out.println(" Which province were you born in?");
                String find = scanner.next();        
                String place=find.substring(0,3);
                for (int i = 0; i <studentlist.size(); i++) 
                {
                    if(studentlist.get(i).getprovince().substring(1,4).equals(place))
                        System.out.println("查找到的老乡有：" + "\n" +studentlist.get(i));
                }             
                break;
                
            case "5":
                isTrue = false;
                System.out.println("退出程序!！！！");
                break;
                default:
                System.out.println("信息输入有误！！！");

            }
        }
    }
        public static int agenear(int age) {      
        int j=0,min=53,value=0,k=0;
         for (int i = 0; i < studentlist.size(); i++)
         {
             value=studentlist.get(i).getage()-age;
             if(value<0) value=-value; 
             if (value<min) 
             {
                min=value;
                k=i;
             } 
          }    
         return k;         
      }

}

public class Student implements Comparable<Student> {    //定义实现Comparable<Student>接口的类Student

    private String name;          //私有变量的定义
    private String number ;
    private String sex ;
    private int age;
    private String province;
   
    public String getName() {          //构造器
        return name;      
    }
    public void setName(String name) {    //访问器
        this.name = name;
    }
    public String getnumber() {
        return number;
    }
    public void setnumber(String number) {   
        this.number = number;
    }
    public String getsex() {
        return sex ;
    }
    public void setsex(String sex ) {
        this.sex =sex ;
    }
    public int getage() {

        return age;
        }
    public void setage(int age) {
        this.age= age;
        }

    public String getprovince() {
        return province;
    }
    public void setprovince(String province) {
        this.province=province ;
    }

    public int compareTo(Student o) {		//compareTo方法将会返回一个整型数值
       return this.name.compareTo(o.getName());
    }

    public String toString() {
        return  name+"\t"+sex+"\t"+age+"\t"+number+"\t"+province+"\n";
    }    
}