七次201771010119穷吉(代码片段)

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 test1() 
        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");
    

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TEST2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");
    

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*/
test2.demo1();
        test2.demo3();
        test2.demo4();
        test2.tese2();
        test2.tese3();
        test2.tese4();
        System.out.println(test2.e2);
        System.out.println(test2.e3);
        System.out.println(test2.e4);
        System.out.println(test2.t2);
        System.out.println(test2.t3);
        System.out.println(test2.t4);
        

package inheritance;

/**
 * This program demonstrates inheritance.
 * @version 1.21 2004-02-21
 * @author Cay Horstmann
 */
public class ManagerTest

   public static void main(String[] args)
   
      // construct a Manager object
      Manager boss = new Manager("Carl Cracker", 80000, 1987, 12, 15);//Manager类定义类对象boss
      boss.setBonus(5000);//更改器更改

      Employee[] staff = new Employee[3];//生成雇员对象

      // fill the staff array with Manager and Employee objects用Manager和Employee对象人员子类填充员工数组
      
      staff[0] = boss;//子类对象
      staff[1] = new Employee("Harry Hacker", 50000, 1989, 10, 1);
      staff[2] = new Employee("Tommy Tester", 40000, 1990, 3, 15);

      // print out information about all Employee objects
      for (Employee e : staff)
         System.out.println("name=" + e.getName() + ",salary=" + e.getSalary());
   

package inheritance;

import java.time.*;

public class Employee

   private String name;
   private double salary;
   private LocalDate hireDay;//定义属性

   public Employee(String name, double salary, int year, int month, int day)
   
      this.name = name;
      this.salary = salary;
      hireDay = LocalDate.of(year, month, day);
   //构造器构造Employee对象

   public String getName()
   
      return name;
   //访问器

   public double getSalary()
   
      return salary;
   

   public LocalDate getHireDay()
   
      return hireDay;
   

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

package inheritance;

public class Manager extends Employee//扩展

   private double bonus;//属性

   /**
    * @param name the employee‘s name
    * @param salary the salary
    * @param year the hire year
    * @param month the hire month
    * @param day the hire day
    */
   public Manager(String name, double salary, int year, int month, int day)
   
      super(name, salary, year, month, day);//调用的是父类参数
      bonus = 0;
   

   public double getSalary()
   
      double baseSalary = super.getSalary();//用父类的getSalary获得的
      return baseSalary + bonus;
   

   public void setBonus(double b)//更改器
   
      bonus = b;
   

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)
   
      // fill the staff array list with three Employee objects
      ArrayList<Employee> staff = new ArrayList<>();

      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));

      // raise everyone‘s salary by 5%
      for (Employee e : staff)
         e.raiseSalary(5);

      // print out information about all Employee objects
      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()
   
      return name;
   

   public double getSalary()
   
      return salary;
   

   public LocalDate getHireDay()
   
      return hireDay;
   

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

package enums;

import java.util.*;

/**
 * This program demonstrates enumerated types.
 * @version 1.0 2004-05-24
 * @author Cay Horstmann
 */
public class EnumTest
  
   public static void main(String[] args)
     
      Scanner in = new Scanner(System.in);
      System.out.print("Enter a size: (SMALL, MEDIUM, LARGE, EXTRA_LARGE) ");
      String input = in.next().toUpperCase();
      Size size = Enum.valueOf(Size.class, input);
      System.out.println("size=" + size);
      System.out.println("abbreviation=" + size.getAbbreviation());
      if (size == Size.EXTRA_LARGE)
         System.out.println("Good job--you paid attention to the _.");      
   


enum Size

   SMALL("S"), MEDIUM("M"), LARGE("L"), EXTRA_LARGE("XL");

   private Size(String abbreviation)  this.abbreviation = abbreviation; 
   public String getAbbreviation()  return abbreviation; 

   private String abbreviation;