第八周作业

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
{
   public static void main(String[] args)
   {
      Employee[] staff = new Employee[3];//普通数组

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

      Arrays.sort(staff);//静态方法sort

      // 输出所有关于Employee对象的信息
      for (Employee e : staff)
         System.out.println("name=" + e.getName() + ",salary=" + e.getSalary());
   }
}

package interfaces;

public class Employee implements Comparable<Employee>//Employee实现JDK内置接口Comparable
{
   private String name;
   private double salary;
   //构造方法
   public Employee(String name, double salary)
   {
      this.name = name;
      this.salary = salary;
   }
   //访问器
   public String getName()
   {
      return name;
   }

   public double getSalary()
   {
      return salary;
   }
   //调用方法
   public void raiseSalary(double byPercent)
   {
      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)
   {
      return Double.compare(salary, other.salary);//静态Double.compare方法
   }
}

package timer;

/**
   @version 1.01 2015-05-12
   @author Cay Horstmann
*/

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.Timer; 
// to resolve conflict with java.util.Timer

public class TimerTest
{  
   public static void main(String[] args)
   {  
      ActionListener listener = new TimePrinter();
       //实现了ActionListener的类对象
      // 构造一个timer对象存放在变量里，叫做listener
      // 每次间隔10秒
      Timer t = new Timer(10000, listener);//定义间隔
      t.start();

      JOptionPane.showMessageDialog(null, "Quit program?");
      System.exit(0);
   }
}

class TimePrinter implements ActionListener//内置接口
{  
   public void actionPerformed(ActionEvent event)
   {  
      System.out.println("At the tone, the time is " + new Date());
      Toolkit.getDefaultToolkit().beep();
   }
}

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
{
   public static void main(String[] args)
   {
      String[] planets = new String[] { "Mercury", "Venus", "Earth", "Mars", 
            "Jupiter", "Saturn", "Uranus", "Neptune" };//定义数组planets
      System.out.println(Arrays.toString(planets));//静态方法
      System.out.println("Sorted in dictionary order:");
      Arrays.sort(planets);//Arrays.sort方法接收实验Lambda类的对象
      System.out.println(Arrays.toString(planets));
      System.out.println("Sorted by length:");
      Arrays.sort(planets, (first, second) -> first.length() - second.length());//Lambda表达式
      System.out.println(Arrays.toString(planets));
            
      Timer t = new Timer(1000, event ->
         System.out.println("The time is " + new Date()));//Lambda表达式
      t.start();   
         
      // keep program running until user selects "Ok"
      JOptionPane.showMessageDialog(null, "Quit program?");
      System.exit(0);   //返回类型      
   }
}

package clone;

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

public class Employee implements Cloneable
{
//定义三个私有属性
   private String name;//string类在lang包
   private double salary;
   private Date hireDay;

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

   public Employee clone() throws CloneNotSupportedException
   {
      // call Object.clone()
      Employee cloned = (Employee) super.clone();//强制类型转换

      // 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();
       //创建一个实例字段变异的实例
      // Example of instance field mutation
      hireDay.setTime(newHireDay.getTime());
   }

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

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

package innerClass;

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.Timer;

/**
 * This program demonstrates the use of inner classes.
 * @version 1.11 2015-05-12
 * @author Cay Horstmann
 */
public class InnerClassTest
{
   public static void main(String[] args)
   {
      TalkingClock clock = new TalkingClock(1000, true);//实现了TalkingClock的类对象
      clock.start();

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

/**
 * A clock that prints the time in regular intervals.
 */
class TalkingClock
{
   //声明属性
    private int interval;
   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)
   {
      this.interval = interval;
      this.beep = beep;
   }//构造方法

   /**
    * Starts the clock.
    */
   public void start()
   {
      ActionListener listener = new TimePrinter();
      Timer t = new Timer(interval, listener);
      t.start();
   }

   public class TimePrinter implements ActionListener//实现ActionListener的公共类TimePrinter
   {
      public void actionPerformed(ActionEvent event)
      {
         System.out.println("At the tone, the time is " + new Date());
         if (beep) Toolkit.getDefaultToolkit().beep();
      }
   }
}

package anonymousInnerClass;

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.Timer;

/**
 * This program demonstrates anonymous inner classes.
 * @version 1.11 2015-05-12
 * @author Cay Horstmann
 */
public class AnonymousInnerClassTest
{
   public static void main(String[] args)
   {
      TalkingClock clock = new TalkingClock();//TalkingClock类声明为私有的
      clock.start(1000, true);

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

/**
 * A clock that prints the time in regular intervals.
 */
class TalkingClock
{
   /**
    * 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)
   {
      ActionListener listener = new ActionListener()
         {
            public void actionPerformed(ActionEvent event)
            {
               System.out.println("At the tone, the time is " + new Date());
               if (beep) Toolkit.getDefaultToolkit().beep();
               //外围类引用.
            }
         };
      Timer t = new Timer(interval, listener);
      t.start();
   }
}

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[] d = new double[20];
      for (int i = 0; i < d.length; i++)
         d[i] = 100 * Math.random();//算法
      ArrayAlg.Pair p = ArrayAlg.minmax(d);
      System.out.println("min = " + p.getFirst());
      System.out.println("max = " + p.getSecond());
   }//访问器
}

class ArrayAlg
{
   /**
    * A pair of floating-point numbers
    */
   public static class Pair
   {
      //声明私有属性       
      private double first;
      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)
      {
         first = f;
         second = s;
      }

      /**
       * Returns the first number of the pair
       * @return the first number
       */
      public double getFirst()
      {
         return first;
      }
     // 访问器
      /**
       * Returns the second number of the pair
       * @return the second number
       */
      public double getSecond()
      {
         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)
   {
      double min = Double.POSITIVE_INFINITY;
      double max = Double.NEGATIVE_INFINITY;//变量
      for (double v : values)
      {
         if (min > v) min = v;
         if (max < v) max = v;
      }
      return new Pair(min, max);
   }
}