Java面向对象编程(上)
主要讲解宋老师里面课后题(无答案的)，以便后期复习使用。（可以私信我要文档资料）
代码题（差不多的就一次）
- 编写一个Student类，包含name、gender、age、id、score属性，分别为String、String、int、int、double类型。
类中声明一个say方法，返回String类型，方法返回信息中包含所有属性值。
在另一个StudentTest类中的main方法中，创建Student对象，并访问say方法和所有属性，并将调用结果打印输出。
public class Student {
private String name;
private String gender;
private int age;
private int id;
private double score;
public Student(String name, String gender, int age, int id, double score) {
this.name = name;
this.gender = gender;
this.age = age;
this.id = id;
this.score = score;
}
public Student() {
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getGender() {
return gender;
}
public String say() {
return "{" +
"name='" + name + '\'' +
", gender='" + gender + '\'' +
", age=" + age +
", id=" + id +
", score=" + score +
'}';
}
public void setGender(String gender) {
this.gender = gender;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public double getScore() {
return score;
}
public void setScore(double score) {
this.score = score;
}
}
public class StudentTest {
public static void main(String[] args) {
Student student = new Student("张三","男",18,1,98.0);
System.out.println(student.say());
}
}
- 定义一个丈夫Husband类，有姓名、年龄、妻子属性
定义一个妻子Wife类，有姓名、年龄、丈夫属性
丈夫类中有一个getInfo方法，其中，能显示自己的姓名，年龄，和他的妻子的姓名，年龄
妻子类中有一个getInfo方法，其中，能显示自己的姓名，年龄，和她的丈夫的姓名，年龄
定义一个测试类，创建妻子和丈夫对象，然后测试
public class Husband {
private String name;
private int age;
private Wife wife;
public String getInfo() {
return "{" +
"husband的name='" + name + '\'' +
",husband的age=" + age +
", wife的name=" + wife.getName() +",wife的age="+wife.getAge()+
'}';
}
public Husband() {
}
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 Wife getWife() {
return wife;
}
public void setWife(Wife wife) {
this.wife = wife;
}
public Husband(String name, int age, Wife wife) {
this.name = name;
this.age = age;
this.wife = wife;
}
}
public class Wife {
private String name;
private int age;
private Husband husband;
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 Husband getHusband() {
return husband;
}
public void setHusband(Husband husband) {
this.husband = husband;
}
public String getInfo() {
return "{" +
"wife的name='" + name + '\'' +
",wife的age=" + age +
", husband的name=" + husband.getName() +",husband的name="+husband.getAge()+
'}';
}
public Wife() {
}
public Wife(String name, int age, Husband husband) {
this.name = name;
this.age = age;
this.husband = husband;
}
}
public class Exer2Test {
public static void main(String[] args) {
Husband husband = new Husband();
husband.setName("张三");
husband.setAge(22);
Wife wife = new Wife();
wife.setName("李四");
wife.setAge(18);
husband.setWife(wife);
wife.setHusband(husband);
System.out.println(husband.getInfo());
System.out.println(wife.getInfo());
}
}
- 定义银行账户类Account，有属性：卡号cid，余额balance，所属用户Customer
银行账户类Account有方法：
（1）getInfo()，返回String类型，返回卡的详细信息
（2）取钱方法withdraw()，参数自行设计，如果取钱成功返回true，失败返回false
（3）存钱方法save()，参数自行设计，如果存钱成功返回true，失败返回false
其中Customer类有姓名、身份证号、联系电话、家庭地址等属性
Customer类有方法say()，返回String类型，返回他的个人信息。
在测试类Bank中创建银行账户类对象和用户类对象，并设置信息，与显示信息
public class Account {
private String cid;
private double balance;
private Customer customer;
public Account() {
}
public Account(String cid, double balance, Customer customer) {
this.cid = cid;
this.balance = balance;
this.customer = customer;
}
public String getCid() {
return cid;
}
public void setCid(String cid) {
this.cid = cid;
}
public double getBalance() {
return balance;
}
public void setBalance(double balance) {
this.balance = balance;
}
public Customer getCustomer() {
return customer;
}
public void setCustomer(Customer customer) {
this.customer = customer;
}
public String getInfo() {
return "{" +
"cid='" + cid + '\'' +
", balance=" + balance +
", customer=" + customer.say() +
'}';
}
public boolean withdraw(double balance){
if (this.balance>balance) {
this.balance -= balance;
return true;
}else
return false;
}
public boolean save(double balance){
if (balance>0) {
this.balance += balance;
return true;
}else
return false;
}
}
public class Customer {
private String name;
private String IDcard;
private String phoneNumber;
private String address;
public Customer() {
}
public Customer(String name, String IDcard, String phoneNumber, String address) {
this.name = name;
this.IDcard = IDcard;
this.phoneNumber = phoneNumber;
this.address = address;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getIDcard() {
return IDcard;
}
public void setIDcard(String IDcard) {
this.IDcard = IDcard;
}
public String getPhoneNumber() {
return phoneNumber;
}
public void setPhoneNumber(String phoneNumber) {
this.phoneNumber = phoneNumber;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String say() {
return "{" +
"name='" + name + '\'' +
", IDcard='" + IDcard + '\'' +
", phoneNumber='" + phoneNumber + '\'' +
", address='" + address + '\'' +
'}';
}
}
public class Bank {
public static void main(String[] args) {
Customer customer = new Customer("张三","721837128973","13212121212","中国");
Account account = new Account("1001",2000,customer);
account.save(10000);//存一万块
account.withdraw(100);//取一百块
System.out.println(account.getInfo());
}
}
- 编程创建一个Box类，在其中定义三个变量表示一个立方体的长、宽和高，定义一个方法求立方体的体积。创建一个对象，求给定尺寸的立方体的体积。
（提供无参的构造器和一个有参的构造器）
public class BoxTest{
public static void main(String[] args) {
Box box = new Box(11,23,33);
int volume = box.getVolume();
System.out.println("该长方体的体积为"+volume);
}
}
class Box {
private int length;
public int getLength() {
return length;
}
public void setLength(int length) {
this.length = length;
}
public int getWidth() {
return width;
}
public void setWidth(int width) {
this.width = width;
}
public int getHeight() {
return height;
}
public void setHeight(int height) {
this.height = height;
}
private int width;
private int height;
public Box(int length, int width, int height) {
this.length = length;
this.width = width;
this.height = height;
}
public Box() {
}
public int getVolume(){
return length * width * height;
}
}
-
定义一个圆类型
提供显示圆周长功能的方法
提供显示圆面积的方法
提供无参的构造器和一个有参的构造器 -
设计一个Dog类，有名字、颜色和年龄属性，定义构造器初始化这些属性，定义输出方法show()显示其信息。
-
写一个人的类
属性：名字，性别，年龄；提供无参的构造器和一个有参的构造器
方法：（1）自我介绍的方法（2）吃饭的方法
创建一个对象“张三” -
写一个汽车类：
属性：品牌；车长；颜色；价格；
创建五个对象：“捷达”，“宝马”，“劳斯莱斯”，“科鲁兹”，“迈锐宝”
提供无参的构造器和一个有参的构造器 -
写一个课程类：
属性：课程名；学时；任课老师；
创建五个对象：“c语言”，“java编程”，“php网络编程”，“c++”，“数据结构”
提供无参的构造器和一个有参的构造器
以上题目和第4题类似都是比较基础的题目 -
定义一个类，用于描述坐标点
0——————>X
|
|
| P(X,Y)
|
|
Y
（1）具有计算当前点到原点距离的功能
（2）求到任意一点（m，n）的距离
（3）求到任意一点（Point p）的距离
（4）具有坐标点显示功能，显示格式（x，y）
（5）提供无参的构造器和一个有参的构造器
public class Point {
public static void main(String[] args) {
Point point = new Point(3,4);
point.show();
point.distanceOrigin();
point.distance(1,2);
}
private double x;
private double y;
public Point() {
}
public Point(double x, double y) {
this.x = x;
this.y = y;
}
public void distanceOrigin(){
System.out.println("到原点的坐标为"+Math.sqrt(x * x + y * y));
}
public void distance(double m , double n){
System.out.println( "(" + x + "," + y + ")"+ "到" + "(" + m + "," + n + ")" + "的距离为"
+Math.sqrt((x-m)*(x-m)+(y-n)*(y-n)));
}
public void show(){
System.out.println("当前坐标为"+"(" + x + "," + y + ")");
}
}
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