写在前面
大家前面的面向对象部分学的怎么样了,快来看看这些题你能不能快速地写出答案,面向对象在Java中是非常重要的,快来检测你的薄弱点在哪,及时查漏补缺!
使用面向对象思想编写下列题目:
1.使用面向对象的思想,编写自定义描述狗的信息。设定属性包括:品种,年龄,心情,名字;方法包括:叫,跑。
要求:
1)设置属性的私有访问权限,通过公有的 get,set 方法实现对属性的访问
2)限定心情只能有“心情好”和“心情不好”两种情况,如果无效输入进行提示, 默认设置“心情好”。
3)设置构造函数实现对属性赋值
4)叫和跑的方法,需要根据心情好坏,描述不同的行为方式。
5)编写测试类,测试狗类的对象及相关方法(测试数据信息自定义)
运行效果图:
代码参考:
class Dog {
private String kind;
private int age;
private String mod;
private String name;
public Dog() {
}
public Dog(String kind, int age, String mod, String name) {
this.kind = kind;
this.age = age;
this.mod = mod(mod);
this.name = name;
}
public String getKind() {return kind;}
public void setKind(String kind) {this.kind = kind;}
public int getAge() {return age;}
public void setAge(int age) {this.age = age;}
public String getMod() {return mod;}
public void setMod(String mod) {this.mod = mod;}
public String getName() {return name;}
public void setName(String name) {this.name = name;}
public void show() {
System.out.println("名字叫" + name + "年龄" + age + "岁的" + kind + "犬" + mod + ",");
}
private String mod(String mod) {
if (mod == null || (!mod.equals("心情很好") && !mod.equals("心情不好"))) {
mod = "心情很好";
System.out.println("输入信息错误,这只狗狗今天" + mod + "!");
}
return mod;
}
public void run() {
if (this.mod.equals("心情很好")) {
System.out.println("名字叫" + this.name + "的" + this.kind + "犬" + this.mod + ",开心的围着主人身边转");
} else if (this.mod.equals("心情不好")) {
System.out.println("名字叫" + this.name + "的" + this.kind + "犬" + this.mod + ",伤心的一动不动");
}
}
public void woof() {
if (this.mod.equals("心情很好")) {
System.out.println("名字叫" + this.name + "的" + this.kind + "犬" + this.mod + ",开心的汪汪叫");
} else if (this.mod.equals("心情不好")) {
System.out.println("名字叫" + this.name + "的" + this.kind + "犬" + this.mod + ",伤心的呜呜叫");
}
}
}
class Test1 {
public static void main(String[] args) {
Dog d1 = new Dog("贵宾", 1, "哈哈哈", "甜心");
Dog d2 = new Dog("贵宾", 1, "心情很好", "甜心");
d2.run();
d2.woof();
System.out.println("========================================");
Dog d3 = new Dog("德国牧羊", 1, "心情不好", "太子");
d3.run();
d3.woof();
System.out.println("========================================");
d2.show();
d3.show();
}
}
2.以面向对象的思想,编写自定义类描述IT从业者。设定属性包括:姓名,年龄,技术方向,工作年限, 工作单位和职务;方法包括:工作。
要求:
1)设置属性的私有访问权限,通过公有的 get,set 方法实现对属性的访问
2)限定 IT 从业人员必须年满 15 岁,无效信息需提示,并设置默认年龄为 15。
3)限定“技术方向”是只读属性(只提供 get 方法)
4)工作方法通过输入参数,接收工作单位和职务,输出个人工作信息
5)编写测试类,测试 IT 从业者类的对象及相关方法(测试数据信息自定义)
运行效果图:
代码参考:
class ItPractitioners {
private String name;
private int age;
private String technicalDirection;
private int workYear;
private String workplace;
private String office;
public ItPractitioners() {
}
public ItPractitioners(String name, int age, int workYear, String technicalDirection) {
this.name = name;
this.age = age(age);
this.workYear = workYear;
this.technicalDirection = technicalDirection;
}
public ItPractitioners(String name, int age, int workYear, String technicalDirection, String workplace, String office) {
this.name = name;
this.age = age(age);
this.workYear = workYear;
this.technicalDirection = technicalDirection;
this.workplace = workplace;
this.office = office;
}
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 getTechnicalDirection() {return technicalDirection;}
private void setTechnicalDirection(String technicalDirection) {this.technicalDirection = technicalDirection;}
public int getWorkYear() {return workYear;}
public void setWorkYear(int workYear) {this.workYear = workYear;}
public String getWorkplace() {return workplace;}
public void setWorkplace(String workplace) {this.workplace = workplace;}
public String getOffice() {return office;}
public void setOffice(String office) {this.office = office;}
private int age(int age) {
if (age < 15) {
System.out.println("年龄信息无效!已修改默认年龄为15");
age = 15;
}
return age;
}
public void work(String workplace, String office) {
System.out.println("姓名:" + this.name);
System.out.println("年龄:" + this.age);
System.out.println("技术方向:" + this.technicalDirection);
System.out.println("工作年限:" + this.workYear);
System.out.println("目前就职于:" + workplace);
System.out.println("职务是:" + office);
}
}
class Test2 {
public static void main(String[] args) {
ItPractitioners i1 = new ItPractitioners("马未龙", 35, 10, "数据库维护");
i1.work("腾讯实业", "数据库维护工程师");
System.out.println("===========================================");
ItPractitioners i2 = new ItPractitioners("张凯", 14, 1, "Java开发");
i2.work("鼎盛科技", "Java开发工程师");
}
}
3.以面向对象的思想,编写自定义类描述图书信息。设定属性包括:书名,作者,出版社名,价格;方法包括:信息介绍 show()。
要求:
1)设置属性的私有访问权限,通过公有的 get,set 方法实现对属性的访问
2)限定价格必须大于 10,如果无效进行提示
3)限定作者,书名为只读属性
4)设计构造方法实现对属性赋值
5)信息介绍方法描述图书所有信息
6)编写测试类,测试图书类的对象及相关方法(测试数据信息自定)
运行效果图:
代码参考:
class Book {
private String bookName;
private String author;
private String publishingHouse;
private double price;
public Book() {
}
public Book(String bookName, String author, String publishingHouse, double price) {
this.bookName = bookName;
this.author = author;
this.publishingHouse = publishingHouse;
this.price = price(price);
}
public String getAuthor() {return author;}
private void setAuthor(String author) {this.author = author;}
public String getBookName() {return bookName;}
private void setBookName(String bookName) {this.bookName = bookName;}
public String getPublishingHouse() {return publishingHouse;}
public void setPublishingHouse(String publishingHouse) {this.publishingHouse = publishingHouse;}
public double getPrice() {return price;}
public void setPrice(double price) {this.price = price;}
private double price(double price) {
if (price <= 10.0) {
System.out.println("该书的价格小于10元,是本无效的书!默认为10元");
price = 10.0;
}
return price;
}
public void show() {
System.out.println("书名:"+this.bookName);
System.out.println("作者:"+this.author);
System.out.println("出版社:"+this.publishingHouse);
System.out.println("价格:"+this.price);
}
}
class Test3{
public static void main(String[] args) {
Book b1 = new Book("鹿鼎记","金庸","人民文学出版社",120.0);
b1.show();
System.out.println("========================================");
Book b2 = new Book("绝代双骄","古龙","中国长安出版社",55.5);
b2.show();
System.out.println("========================================");
Book b3 = new Book("鹿鼎记","金庸","人民文学出版社",8.0);
b3.show();
}
}
4.某公司要开发名为”我爱购物狂”的购物网站,请使用面向对象的思想设计描述商品信息。
要求:
1)分析商品类别和商品详细信息属性和方法,设计商品类别类和商品详细信息类
2)在商品详细信息类中通过属性描述该商品所属类别
3)设置属性的私有访问权限,通过公有的 get,set 方法实现对属性的访问
4)编写测试类,测试商品类别类和商品详细信息类的对象及相关方法(测试数据 信息自定)
5)创建包 info—存放商品类别类和商品详细信息类,创建包 test—存放测试类参考分析思路:
商品类别类:
属性:类别编号,类别名称商品详细信息类:
属性:商品编号,商品名称,所属类别,商品数量(大于 0),商品价格(大于 0),
方法:盘点的方法,描述商品信息。内容包括商品名称,商品数量,商品价格,现在商品总价以及所属类别信息
运行效果图:
代码参考:
public class ProductCategory {
private String categoryId;
private String categoryName;
public ProductCategory() {
}
public ProductCategory(String categoryName, String categoryId) {
this.categoryName = categoryName;
this.categoryId = categoryId;
}
public String getCategoryName() {return categoryName;}
public void setCategoryName(String categoryName) {this.categoryName = categoryName;}
public String getCategoryId() {return categoryId;}
public void setCategoryId(String categoryId) {this.categoryId = categoryId;}
public void show(){
System.out.println("商品类别ID为:"+categoryId+" 对应的类别为:"+categoryName);
}
}
public class ProductInformation {
private String productId;
private String productName;
private ProductCategory category;
private int number;
private double price;
public ProductInformation() {
}
public ProductInformation(String productName, ProductCategory category, int number, double price) {
this.productName = productName;
this.category = category;
this.number = number(number);
this.price = price(price);
}
public ProductInformation(String productId, String productName, ProductCategory category, int number, double price) {
this.productId = productId;
this.productName = productName;
this.category = category;
this.number = number(number);
this.price = price(price);
}
public String getProductId() {
return productId;
}
public void setProductId(String productId) {
this.productId = productId;
}
public String getProductName() {
return productName;
}
public void setProductName(String productName) {
this.productName = productName;
}
public ProductCategory getCategory() {
return category;
}
public void setCategory(ProductCategory category) {
this.category = category;
}
public int getNumber() {
return number;
}
public void setNumber(int number) {
this.number = number;
}
public double getPrice() {
return price;
}
public void setPrice(int price) {
this.price = price;
}
private int number(int number) {
if (number < 0) {
number = 0;
System.out.println("库存数量异常,请联系管理员");
}
return number;
}
private double price(double price) {
if (price < 0.0) {
price = 0.0;
System.out.println("输入价格无效!默认为0.0");
}
return price;
}
public void show1() {
System.out.println("商品id为:" + productId + " 商品名称为:" + productName + " 所属类别为" + category.getCategoryName() + " 商品数量为:" + number + " 商品价格为:" + price);
}
public void show2() {
System.out.println("商品名称:" + productName);
System.out.println("所属类别:" + category.getCategoryName());
System.out.println("商品售价:" + price);
System.out.println("库存数量:" + number);
System.out.println("商品总价:" + price * number);
}
}
public class Test {
public static void main(String[] args) {
ProductCategory pc1 = new ProductCategory("洗发水", "00001");
pc1.show();
System.out.println("========================================");
ProductInformation pi1 = new ProductInformation("潘婷洗发水400ml",pc1,16,40.5);
pi1.show1();
System.out.println("========================================");
pi1.show2();
System.out.println("========================================");
ProductInformation pi2 = new ProductInformation("蜂花洗发水250ml",pc1,-1,11.5);
pi2.show2();
}
}
写在最后
之前分享了两个关于测试类的题目,在这里给出参考答案:
/*
定义一个类Demo,其中定义一个求两个数据和的方法,定义一个测试类Test,进行测试
*/
//3.0写法
class Demo {
private int a;
private int b;
public Demo(int a, int b) {
this.a = a;
this.b = b;
}
public int getB() {
return b;
}
public void setB(int b) {
this.b = b;
}
public int getA() {
return a;
}
public void setA(int a) {
this.a = a;
}
public int sum() {
return a + b;
}
}
class Test {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("请输入两个整数(以空格分隔):");
int a = sc.nextInt();
int b = sc.nextInt();
Demo d1 = new Demo(a, b);
int sum = d1.sum();
System.out.println("您输入的两个数的和为:" + sum);
}
}
/*
定义一个长方形类,定义 求周长和面积的方法,然后定义一个测试类Test2,进行测试。
*/
class Demo2 {
private int a;
private int b;
public Demo2(int b, int a) {
this.b = b;
this.a = a;
}
public int getA() {
return a;
}
public void setA(int a) {
this.a = a;
}
public int getB() {
return b;
}
public void setB(int b) {
this.b = b;
}
public int zhouChang() {
return 2 * (a + b);
}
public int mianJi() {
return a * b;
}
}
class Test2 {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("请输入一个矩形的长和宽(长和宽都应该是正整数,以空格分隔):");
int h = sc.nextInt();
int w = sc.nextInt();
Demo2 d1 = new Demo2(h, w);
int c = d1.zhouChang();
int s = d1.mianJi();
System.out.println("您输入的矩阵的周长为:" + c + "\n您输入的矩阵的面积为:" + s);
}
}
好了,今天的分享到这就结束了,面向对象思想在初学时还是比较难懂的,大家一定要多多练习,查缺补漏,才能把它学好,如果有代码中有问题,欢迎在底下评论留言,代码仅供参考,不代表最终答案!
标签:练习题,String,int,void,System,private,基础知识,JavaSE,public From: https://www.cnblogs.com/cjybigdatablog/p/18345954