java练习题之方法重载+封装

1:(封装)编程:编写Teacher类,姓名(String) 年龄(int) 性别(boolean),要求如下:

① 属性私有,提供公开的get、set方法

② 提供无参数、有参数的构造方法

③ 功能方法teach(),返回值类型为void

package packageload;

public class Teacher {
    private String name;
    private int age;
    private boolean sex;

    public Teacher() {
    }

    public Teacher(String name, int age, boolean 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 boolean isSex() {
        return sex;
    }

    public void setSex(boolean sex) {
        this.sex = sex;
    }
    public void teach(){
        System.out.println("这是一个教书的方法");
    }
}


    public void setSex(boolean sex) {
        this.sex = sex;
    }
    public void teach(){
        System.out.println("这是一个教书的方法");
    }
}

2:(封装)编程:定义一个网络用户类(User 类),需要处理的信息有用户ID、用户密码password、邮箱地址(email),要求如下:

①对类进行封装,私有化属性,并提供公开的get/set方法,设置 email 采用格式为:用户名加 上”@zparkhr.com.cn”; 查看密码处理为 xxx

②提供带有两个参数的构造方法,为用户 ID 和用户密码赋值,同时提供带有三个参数的构造方法

③定义一个测试类,分别利用不同的构造方法创建对象,并利用方法,展示用户的信息。

package packageload;

public class User {
    private String id;
    private String password;
    private String email;

    public User() {
    }

    public User(String id, String password) {
        this.id = id;
        this.password = password;
        this.password="xxx";
        email=id+"@zparkhr.com.cn";
    }

    public User(String id, String password, String email) {
        this.id = id;
        this.password = password;
        this.password="xxx";
        this.email = email;
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }
}





package packageload;

public class Test {
    public static void main(String[]args){
        User s=new User("123445","a123123");
        System.out.println(s.getId());
        System.out.println(s.getPassword());
        System.out.println(s.getEmail());

        User s1=new User();
        s1.setId("asdasd");
        s1.setPassword("xxx");
        s1.setEmail("asdasd");
        System.out.println(s1.getId());
        System.out.println(s1.getPassword());
        System.out.println(s1.getEmail());

        User s2=new User("asdas","asd","asdasd");
        System.out.println(s2.getId());
        System.out.println(s2.getPassword());
        System.out.println(s2.getEmail());
    }
}

3:(封装)编程:定义一个 Book 类(代表教材),具有属性名称(title)、页数(pageNum),要求如下:

①对类进行封装,属性私有化,并提供公开的 get/set 方法;其中要求页数不能少于 200 页,否

则输出”错误信息”,并赋予默认值 200

②提供无参数和有参数的构造方法

③ 编写一个测试类,创建对象并为属性赋值,将对象的信息展示在控制台上

package packageload;

public class Book {
    private String title;
    private int pageNum=200;

    public Book() {
    }

    public Book(String title, int pageNum) {
        this.title = title;
        this.pageNum = pageNum;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public int getPageNum() {
        return pageNum;
    }

    public void setPageNum(int pageNum) {
        this.pageNum = pageNum;
    }
}





Book b=new Book();
b.getPageNum();
b.setPageNum(100);
int num=b.getPageNum();
if(num<200){
    System.out.println("错误信息");
}else{
    System.out.println(num);
}

4:(封装)编程:已知一个 Student 类,代码如下:

java练习题之方法重载+封装_第1张图片

①将 Student 类进行封装,即属性均私有化,并提供 get/set 方法

②为 Student 类添加一个 getPostAddress 方法,要求返回 Student 对象的地址和邮编

③ 定义一个测试类,创建对象并为属性赋值,将用户的信息进行展示

package packageload;

public class Student {
    private String name;
    private int age;
    private String address;
    private String zipCode;
    private int phoneNum;

    public Student() {
    }

    public Student(String name, int age, String address, String zipCode, int phoneNum) {
        this.name = name;
        this.age = age;
        this.address = address;
        this.zipCode = zipCode;
        this.phoneNum = phoneNum;
    }
    public void getPostAddress(){
//        Student student=new Student("张三",21,"北京","@zql",123456789);
        this.getAddress();
        System.out.println(this.address);
        this.getZipCode();
        System.out.println(this.zipCode);
//        return student;
    }

    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 getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public String getZipCode() {
        return zipCode;
    }

    public void setZipCode(String zipCode) {
        this.zipCode = zipCode;
    }

    public int getPhoneNum() {
        return phoneNum;
    }

    public void setPhoneNum(int phoneNum) {
        this.phoneNum = phoneNum;
    }
}



Student st=new Student("张三",18,"北京天安门","000001",1234567888);
st.getPostAddress();
System.out.println(st.getName()+"  "+st.getAge()+"  "+st.getAddress()+"  "+st.getZipCode()+"  "+st.getPhoneNum());

5:(封装)编程:定义一个 Dog 类,类中属性有名字、年龄、性别(true-公),要求如下:

①对类进行封装,私有化属性,并提供公开的get/set方法

②提供一个无参数的构造方法和一个带有三个参数的构造方法

③类中定义一个无参数的play 方法:输出 宠物狗

④类中定义一个带有一个参数的play 方法,参数类型为 int hours,打印输出玩的小时数

⑤定义一个测试类,分别用无参数的构造法和有参数的构造方法创建对象,并对属性赋值,分别将对象 的信息打印在控制台上,调用play 方法。

package packageload;

public class Dog {
    private String name;
    private int age;
    private boolean sex;
    public Dog(){

    }

    public Dog(String name, int age, boolean 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 boolean isSex() {
        return sex;
    }

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

    public void play(){
        System.out.println("宠物狗");
    }
    public void play(int hours){
        System.out.println("玩了"+hours+"个小时");
    }
}



Dog d=new Dog("大黄",2,true);
boolean defult=d.isSex();
if(defult){
    System.out.println("公狗");
}else {
    System.out.println("母狗");
}
System.out.println(d.getName()+d.getAge());
d.play();
d.play(10);

6:(封装)编程:定义一个交通工具类(Vehicle),类中属性有商标(brand)、颜色(color);要求如下:

①对类进行封装,私有化属性,并提供公开的get/set方法

②提供一个无参数的构造方法和有参数的构造方法

③功能方法:移动方法(move() ),此方法一旦被调用,控制台显示”我已经启动” 展示信息 ( showInfo() ),此方法,展示商标和颜色信息

④定义一个测试类,创建一个交通工具对象,并为属性赋值;将对象的信息打印输出,并调用对象的方法。

package packageload;

public class Vehicle {
    private String brand;
    private String color;

    public Vehicle() {
    }

    public Vehicle(String brand, String color) {
        this.brand = brand;
        this.color = color;
    }

    public String getBrand() {
        return brand;
    }

    public void setBrand(String brand) {
        this.brand = brand;
    }

    public String getColor() {
        return color;
    }

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

    public void move(){
        System.out.println("我已启动");
        showInfo();
    }
    
    public void showInfo(){
        System.out.println(brand+"  "+color);
    }
}

7:(封装)编程:模拟简单的计算器,定义一个类(Number),类中定义两个整数类型的属性值 1(v1)和值 2(v2);

①对类进行封装,私有化属性,并提供公开的get/set方法

②提供两个构造方法,可以为属性赋值

③提供加( add() )、减( subtration() )、乘( multip() )、除( division() )功能方法

④定义一个测试类,创建该类对象,并通过调用方法完成两个数值的加、减、乘、除运算

package packageload;

public class Number {
    private int v1;
    private int v2;

    public Number() {
    }

    public Number(int v1, int v2) {
        this.v1 = v1;
        this.v2 = v2;
    }

    public int getV1() {
        return v1;
    }

    public void setV1(int v1) {
        this.v1 = v1;
    }

    public int getV2() {
        return v2;
    }

    public void setV2(int v2) {
        this.v2 = v2;
    }

    public void add(){
        System.out.println("v1+v2="+(v1+v2));
    }
    public void subtration(){
        System.out.println("v1-v2="+(v1-v2));
    }
    public void multip(){
        System.out.println("v1*v2="+(v1*v2));
    }
    public void division(){
        System.out.println("v1/v2="+(v1/v2));
    }

}

8:(封装)编程:设计一个 Worker 类和 Address 类,类的要求如下:

定义一个Worker 类,类中定义三个属性:姓名、年龄、工资(salary),要求如下:

① 对类进行封装,私有化属性,并提供公开的get/set方法

②提供公开无参构造方法和三个参数的构造方法

③定义无参的 work 方法和带整数参数 work(int hours)方法,参数代表工人工作的小时数

定义一个Address 类,类中定义属性:地址(addr)、邮编(zipCode),要求如下:

① 对类进行封装,私有化属性,并提供公开的get/set方法

②为此类提供无参数和有参数的构造方法。

③为Worker 类添加一个Address 类型的属性 address,封装并提供get/set方法

④定义一个测试类,创建一个 Worker 对象,其姓名为张三、年龄为 18、工资为 1000.0; 家庭地址为:北京市海淀区清华园 1 号院、邮编为 100010,并展示用户信息

package packageload;

public class Worker {
    private String name;
    private int age;
    private double salary;
    private packageload.Address addr;
    public Worker(){

    }
    public Worker(String name, int age, double salary, Address addr){
        this.name=name;
        this.age=age;
        this.salary=salary;
        this.addr=addr;
    }

    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 double getSalary() {
        return salary;
    }

    public void setSalary(double salary) {
        this.salary = salary;
    }

    public Address getAddr() {
        return addr;
    }

    public void setAddr(Address addr) {
        this.addr = addr;
    }

    public void work(){
        System.out.println("这是一个无参的方法");
    }
    public void workTime(int time){
        System.out.println("工人的工作时间为:"+time);
    }
}



package packageload;

public class Address {
    private String address;
    private String zipCode;
    private Address(String s){

    }
    public Address(String a,String z){
        this.address=a;
        this.zipCode=z;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public String getZipCode() {
        return zipCode;
    }

    public void setZipCode(String zipCode) {
        this.zipCode = zipCode;
    }
}



Worker worker=new Worker();
worker.setName("张三");
worker.setAge(18);
worker.setSalary(100000);
worker.setAddr(new Address("北京市海淀区清华园 1 号院","100010"));
System.out.println(worker.getName()+ worker.getAge()+ worker.getSalary()+ worker.getAddr());

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