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falseif (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;}
}