19、案例分析一（Address）
实现一个地址类，包含国家，省份，城市，街道，邮政编码
实现一个简单java类
class Address { private String country; private String province; private String city; private String street; private String zipcode; // setter public void setCountry(String country){ this.country = country; } public void setProvince(String province){ this.province = province; } public void setCity(String city){ this.city = city; } public void setStreet(String street){ this.street = street; } public void setZipcode(String zipcode){ this.zipcode = zipcode; } // getter public String getCountry(){ return this.country; } public String getProvince(){ return this.province; } public String getCity(){ return this.city; } public String getStreet(){ return this.street; } public String getZipcode(){ return this.zipcode; } // info public String getInfo(){ return "国家: " + this.country + ", 省份: " + this.province + ", 城市: " + this.city + ", 街道: " + this.street + ", 邮政编码: " + this.zipcode; } public Address(String country, String province, String city, String street, String zipcode){ this.country = country; this.province = province; this.city = city; this.street = street; this.zipcode = zipcode; } public static void main(String[] args) { Address address = new Address("中国", "北京", "朝阳", "大望路", "10001"); System.out.println(address.getInfo()); // 国家: 中国, 省份: 北京, 城市: 朝阳, 街道: 大望路, 邮政编码: 10001 } }
20、案例分析二（Employee）
实现一个员工类，包含编号，姓名，薪水，税率，还包括薪水增长计算和增长后的工资
class Employee{ private long no; private String name; private double salary; private double rate; // setter getter ... public String getInfo(){ return "编号：" + this.no + ", 姓名： " + this.name + ", 薪水 " + this.salary + ", 涨幅： " + this.rate; } public void increaseSalary(){ this.salary = this.salary * (1 + this.rate); } public Employee(long no, String name, double salary, double rate){ this.no = no; this.name = name; this.salary = salary; this.rate = rate; } public static void main(String[] args){ Employee employee = new Employee(1L, "张三", 3000.0, 0.3); System.out.println(employee.getInfo()); // 编号：1, 姓名： 张三, 薪水 3000.0, 涨幅： 0.3 employee.increaseSalary(); System.out.println(employee.getInfo()); // 编号：1, 姓名： 张三, 薪水 3900.0, 涨幅： 0.3 } }
21、案例分析三（Dog）
创建Dog类，有名字，颜色，年龄，定义构造方法初始化属性
class Account{ private String name; private double balance; public Account(String name){ this(name, 0.0); } public Account(String name, double balance){ this.name = name;; this.balance = balance;; } // 查询余额 public double getBalance(){ return this.balance; } public static void main(String[] args) { Account account = new Account("张三", 2000.0); System.out.println(account.getBalance()); // 2000.0 } }
22、案例分析四（Account）
定义银行账户类，包括
1、数据：账户名称，账户余额
2、方法：开户（设置账号，余额），利用构造方法完成
3、查询余额
class Account{ private String name; private double balance; public Account(String name){ this(name, 0.0); } public Account(String name, double balance){ this.name = name;; this.balance = balance;; } // 查询余额 public double getBalance(){ return this.balance; } public static void main(String[] args) { Account account = new Account("张三", 2000.0); System.out.println(account.getBalance()); // 2000.0 } }
23、案例分析五（User）
创建用户类
1、用户名，记录用户个数
2、获取用户数
class User{ private String name; private static int count = 0; public User(String name){ this.name = name; count++; } public static int getCount(){ return count; } public static void main(String[] args) { User user1 = new User("小明"); User user2 = new User("小红"); User user3 = new User("小花"); System.out.println(User.getCount()); // 3 } }
24、案例分析六（Book）
创建图书类
数据：书名，价格，编号（利用静态数据实现自动编号）
方法：统计总数
class Book{ private int uid; private String name; private double price; private static int count = 0; public Book(String name, Double price){ count++; this.uid = count; this.name = name ; this.price = price ; } public String getInfo(){ return "<"+ this.uid + "> <<" + this.name +">> "+ this.price; } public static int getCount(){ return count; } public static void main(String[] args) { Book book1 = new Book("今日头条", 12.0); Book book2 = new Book("百度", 14.0); Book book3 = new Book("腾讯", 11.0); System.out.println(Book.getCount()); // 3 System.out.println(book3.getInfo()); // <3> <<腾讯>> 11.0 } }
