201771010110孔维滢面向对象程序设计（java）第7周学习指导及要求

package TEST2;
public class Main {
    public static void main(String[] args) {
        TEST2 test2 = new TEST2();
        /*在下面分别调用 demo1 demo2 demo3 demo4 test1 test2 test3 test4方法
        和t1 t2 t3 t3 e1 e2 e3 e4属性，好好理解继承和权限修饰符的用法与区别*/
        String e2 = test2.e2;
        System.out.println(e2);
        String e3 = test2.e3;
        System.out.println(e3);
        String e4 = test2.e4;
        System.out.println(e4);
        String t2 = test2.t2;
        System.out.println(t2);
        String t3 = test2.t3;
        System.out.println(t3);
        String t4 = test2.t4;
        System.out.println(t4);
        test2.demo1();
        test2.demo3();
        test2.demo4();
        test2.tese2();
        test2.tese3();
        test2.tese4();

package TEST2;
public class TEST1 {
    private String t1 = "这是TEST1的私有属性";
    public String t2 = "这是TEST1的公有属性";
    protected String t3 = "这是TEST1受保护的属性";
    String t4 = "这是TEST1的默认属性";
    private void tese1() {
        System.out.println("我是TEST1用private修饰符修饰的方法");
    }
    public void tese2() {
        System.out.println("我是TEST1用public修饰符修饰的方法");
    }
    protected void tese3() {
        System.out.println("我是TEST1用protected修饰符修饰的方法");
    }
    void tese4() {
        System.out.println("我是TEST1无修饰符修饰的方法");
    }
}

package TEST2;
public class TEST2 extends TEST1{
    private String e1 = "这是TEST2的私有属性";
    public String e2 = "这是TEST2的公有属性";
    protected String e3 = "这是TEST2受保护的属性";
    String e4 = "这是TEST1的默认属性";
    public void demo1() {
        System.out.println("我是TEST2用public修饰符修饰的方法");
    }
    private void demo2() {
        System.out.println("我是TEST2用private修饰符修饰的方法");
    }
    protected void demo3() {
        System.out.println("我是TEST2用protected修饰符修饰的方法");
    }
    void demo4() {
        System.out.println("我是TEST2无修饰符修饰的方法");
    }
}

package equals;

/**
 * This program demonstrates the equals method.
 * @version 1.12 2012-01-26
 * @author Cay Horstmann
 */
public class EqualsTest
{
   public static void main(String[] args)
   {
       //
      Employee alice1 = new Employee("Alice Adams", 75000, 1987, 12, 15);
      Employee alice2 = alice1;
      Employee alice3 = new Employee("Alice Adams", 75000, 1987, 12, 15);
      Employee bob = new Employee("Bob Brandson", 50000, 1989, 10, 1);

      System.out.println("alice1 == alice2: " + (alice1 == alice2));

      System.out.println("alice1 == alice3: " + (alice1 == alice3));

      System.out.println("alice1.equals(alice3): " + alice1.equals(alice3));

      System.out.println("alice1.equals(bob): " + alice1.equals(bob));

      System.out.println("bob.toString(): " + bob);

      Manager carl = new Manager("Carl Cracker", 80000, 1987, 12, 15);
      Manager boss = new Manager("Carl Cracker", 80000, 1987, 12, 15);
      boss.setBonus(5000);
      System.out.println("boss.toString(): " + boss);
      System.out.println("carl.equals(boss): " + carl.equals(boss));
      System.out.println("alice1.hashCode(): " + alice1.hashCode());
      System.out.println("alice3.hashCode(): " + alice3.hashCode());
      System.out.println("bob.hashCode(): " + bob.hashCode());
      System.out.println("carl.hashCode(): " + carl.hashCode());
   }
}

package equals;

import java.time.*;
import java.util.Objects;

public class Employee
{
   private String name;
   private double salary;
   private LocalDate hireDay;

   public Employee(String name, double salary, int year, int month, int day)
   {
      this.name = name;
      this.salary = salary;
      hireDay = LocalDate.of(year, month, day);
   }

   public String getName()//返回这个类的名字
   {
      return name;
   }

   public double getSalary()
   {
      return salary;
   }

   public LocalDate getHireDay()
   {
      return hireDay;
   }

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

   public boolean equals(Object otherObject)//比较两个对象是否相等，如果两个对象指向同一块储存区域方法返回true，否则返回false；在自定义类中，应该覆盖这个方法。
   {
      // 快速测试对象是否相同
      if (this == otherObject) return true;

      //如果显式参数为空必须返回false
      if (otherObject == null) return false;

      //如果类不匹配则它们不相等
      if (getClass() != otherObject.getClass()) return false;

      //现在已知otherObject是一个非空雇员
      Employee other = (Employee) otherObject;

      //测试字段是否具有相同值
      return Objects.equals(name, other.name) && salary == other.salary && Objects.equals(hireDay, other.hireDay);
   }

   public int hashCode()//返回对象的散列码
   {
      return Objects.hash(name, salary, hireDay); 
   }

   public String toString()//返回描述该对象值的字符串，在自定义类中，应该覆盖这个方法。
   {
      return getClass().getName() + "[name=" + name + ",salary=" + salary + ",hireDay=" + hireDay
            + "]";//对于getClass()来说，它可以在运行时获得类。
   }
}

package equals;

public class Manager extends Employee
//构建子类Manager继承父类Employ
{
   private double bonus;

   public Manager(String name, double salary, int year, int month, int day)
   {
      super(name, salary, year, month, day);
      bonus = 0;
   }

   public double getSalary()
   {
      double baseSalary = super.getSalary();
      return baseSalary + bonus;
   }

   public void setBonus(double bonus)
   {
      this.bonus = bonus;
   }

   public boolean equals(Object otherObject)//比较两个对象是否相等，如果两个对象指向同一块储存区域方法返回true，否则返回false；在自定义类中，应该覆盖这个方法。
   {
      if (!super.equals(otherObject)) return false;
      Manager other = (Manager) otherObject;
      //检查this和other属于同一个类

      return bonus == other.bonus;
   }

   public int hashCode()//返回对象的散列码
   {
      return java.util.Objects.hash(super.hashCode(), bonus);
   }

   public String toString()//返回描述该对象值的字符串，在自定义类中，应该覆盖这个方法。
   {
      return super.toString() + "[bonus=" + bonus + "]";//超类中使用了getClass().getName()，那么子类只要调用super.toString()就可以了。
   }
}

package arrayList;

import java.util.*;

/**
 * This program demonstrates the ArrayList class.
 * @version 1.11 2012-01-26
 * @author Cay Horstmann
 */
public class ArrayListTest
{
   public static void main(String[] args)
   {
      //声明和构造一个保存Employee对象的数组列表，new ArrayList<>()将赋值一个类型为ArrayList<Employee>的变量，所以泛型类型为Employee。
      ArrayList<Employee> staff = new ArrayList<>();

      //用三个雇员对象填充数组
      staff.add(new Employee("Carl Cracker", 75000, 1987, 12, 15));
      staff.add(new Employee("Harry Hacker", 50000, 1989, 10, 1));
      staff.add(new Employee("Tony Tester", 40000, 1990, 3, 15));

      //将所有人的薪水增加5%
      for (Employee e : staff)
         e.raiseSalary(5);

      //打印所有雇员对象的信息
      for (Employee e : staff)
         System.out.println("name=" + e.getName() + ",salary=" + e.getSalary() + ",hireDay="
               + e.getHireDay());
   }
}

package arrayList;

import java.time.*;

public class Employee
{
   private String name;
   private double salary;
   private LocalDate hireDay;

   public Employee(String name, double salary, int year, int month, int day)
   {
      this.name = name;
      this.salary = salary;
      hireDay = LocalDate.of(year, month, day);
   }

   public String getName()//返回这个类的名字
   {
      return name;
   }

   public double getSalary()
   {
      return salary;
   }

   public LocalDate getHireDay()
   {
      return hireDay;
   }

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