第6章 面向对象(高级篇)

interface ClassName {
public String getClassName();
}
class Company implements ClassName {

@Override
public String getClassName() {
return new Company().getClass().getName();
}

}

public class CompanyTest {

public static void main(String[] args) {
ClassName cn = new Company();
System.out.println(cn.getClassName());
}

}

class Graph {
private String color;//颜色
private String shape;//图形

public Graph(String color, String shape) {
this.color = color;
this.shape = shape;
}

public String getColor() {
return color;
}

public void setColor(String color) {
this.color = color;
}

public String getShape() {
return shape;
}

public void setShape(String shape) {
this.shape = shape;
}

}

class Person {
private String name;
private String addr;
private char sex;
private int age;

public Person(String name, String addr, char sex, int age) {
this.name = name;
this.addr = addr;
this.sex = sex;
this.age = age;
}

public Person(String name, char sex) {
this.name = name;
this.sex = sex;
}

public Person() {

}

public void show() {
System.out.println("姓名："+name+"，年龄："+age+"，性别："+sex+"，地址："+addr);
}

}
class Student extends Person {
private double math;
private double english;

public Student(String name, String addr, char sex, int age, double math, double english) {
super(name, addr, sex, age);
this.math = math;
this.english = english;
}

public Student(double math, double english) {
this.math = math;
this.english = english;
}

public Student() {

}

public void show() {
super.show();
System.out.println("数学成绩："+math+"，英语成绩："+english);
}

}

abstract class Employee {
private String name;
private int age;
private String sex;

public Employee(String name, int age, String sex) {
this.name = name;
this.age = age;
this.sex = sex;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public int getAge() {
return age;
}

public void setAge(int age) {
this.age = age;
}

public String getSex() {
return sex;
}

public void setSex(String sex) {
this.sex = sex;
}

public abstract void show();
}

class Manager extends Employee {
private String duty;
private double salary;

public Manager(String name, int age, String sex, String duty, double salary) {
super(name, age, sex);
this.duty = duty;
this.salary = salary;
}

@Override
public void show() {
System.out.println("姓名："+super.getName()+"，年龄："+super.getAge()+
"，性别："+super.getSex()+"，职务："+duty+"，年薪："+salary);
}

}
class Pro extends Employee {
private String department;
private double monthSalary;
public Pro(String name, int age, String sex, String department, double monthSalary) {
super(name, age, sex);
this.department = department;
this.monthSalary = monthSalary;
}
@Override
public void show() {
System.out.println("姓名："+super.getName()+"，年龄："+super.getAge()+
"，性别："+super.getSex()+"，所属部门："+department+"，月薪："+monthSalary);
}

abstract class Shape {
public abstract void area();
public abstract void perimeter();
}
class Rectangle extends Shape {
private double length;
private double width;

public Rectangle(double length, double width) {
this.length = length;
this.width = width;
}

@Override
public void area() {
System.out.println("area="+length*width);
}

@Override
public void perimeter() {
System.out.println("perimeter="+(length+width)*2);
}

}
class Circle extends Shape {
public static final double PI = 3.14;
private double radius;

public Circle(double radius) {
this.radius = radius;
}

@Override
public void area() {
System.out.println("area="+PI * radius * radius);
}

@Override
public void perimeter() {
System.out.println("perimeter="+PI * radius * 2);
}

}
class EquilateralTriangle extends Shape {
private double length;

public EquilateralTriangle(double length) {
this.length = length;
}

@Override
public void area() {
System.out.println("area="+length*length*Math.sqrt(3) / 4);
}

@Override
public void perimeter() {
System.out.println("perimeter="+length*3);
}

}

/*
需求：使用面向对象的概念表示出下面的生活场景：
小明去超市买东西，所有买到的东西都放在购物车中，最后到收银台一起结账
*/
abstract class Good {
private String name;          //商品名称
private double price;         //商品价格
private int count;            //商品数量

public Good(String name, double price, int count) {
this.name = name;
this.price = price;
this.count = count;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public double getPrice() {
return price;
}

public void setPrice(double price) {
this.price = price;
}

public int getCount() {
return count;
}

public void setCount(int count) {
this.count = count;
}
public abstract String getInfo();

}
class Book extends Good {
private String author;         //作者
private String publish;        //出版社

public Book(String name, double price, int count, String author, String publish) {
super(name, price, count);
this.author = author;
this.publish = publish;
}

@Override
public String getInfo() {
return "所购书名："+super.getName()+"，单价："+super.getPrice()+
"，购买册数："+super.getCount()+"，作者："+author+"，出版社："+publish
+"，总计："+super.getPrice()*super.getCount();
}
}
class Cloth extends Good {
private String brand;           //品牌
private String style;           //款式

public Cloth(String name, double price, int count, String brand, String style) {
super(name, price, count);
this.brand = brand;
this.style = style;
}

@Override
public String getInfo() {
return "所购衣服名称："+super.getName()+"，单价："+super.getPrice()+
"，购买件数："+super.getCount()+"，衣服品牌："+brand+"，衣服样式："+style
+"，总计："+super.getPrice()*super.getCount();
}

}
class ShopCar {
private Good[] goods;
private int foot = 0;

public ShopCar(int len) {
if(len > 0)
this.goods = new Good[len];
else
this.goods = new Good[1];
}

public boolean add(Good g) {
boolean isAdd = false;
if(foot != goods.length) {
goods[foot] = g;
foot++;
isAdd = true;
}
return isAdd;
}

public Good[] search(String keyWord) {
Good[] gs = null;
int count = 0;
for(int x = 0; x < goods.length; x++) {
if(goods[x] != null) {
if(goods[x].getName().indexOf(keyWord) != -1)
count++;
}
}
gs = new Good[count];
for(int i = 0, x = 0; i < goods.length; i++) {
if(goods[i] != null) {
if(goods[i].getName().indexOf(keyWord) != -1) {
gs[x] = goods[i];
x++;
}
}
}
return gs;
}

public Good[] getGoods() {
return goods;
}

}
public class Practice6 {

public static void main(String[] args) {
ShopCar sc = new ShopCar(5);
sc.add(new Book("Java开发实战经典", 79.80, 1, "李兴华", "清华大学出版社"));
sc.add(new Book("Thinking In Java", 89.80, 3, "Job", "机械工业出版社"));
sc.add(new Book("西游记", 45.67, 56, "吴承恩", "商务印书馆"));
sc.add(new Cloth("T恤", 100.50, 1, "李宁", "男士-L"));
sc.add(new Cloth("牛仔裤", 356.78, 2, "森马", "男士-M"));
System.out.println("===================已买到的商品清单===================");
print(sc.getGoods());
System.out.println("===================查询商品详细信息===================");
try {
print(sc.search(args[0]));
} catch(Exception e) {
System.out.println("未输入要查询商品或输入错误，"+"格式为：\njava Practice6  商品名(或商品名中的任意字符)");
}
}

private static void print(Good[] goods) {
if(goods != null)
for(int x = 0; x < goods.length; x++) {
System.out.println(goods[x].getInfo());
}
}

}