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";

    }

}