PTA JAVA面向对象作业总结

于 2024-11-02 18:38:39 发布
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PTA JAVA面向对象作业总结

7-1 jmu-Java-03面向对象基础-01-构造方法与toString

import java.util.Scanner;
import java.util.ArrayList;
import java.util.List;

public class Main {
    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        class Person{
            // 人员姓名
            private String name;
            // 年龄
            private int age;
            // 性别  true 男 / false女
            private boolean gender;
            // 编号
            private int id;

            // 无参构造器
            public void NoParameterConstructor() {
                System.out.println("This is constructor");
                System.out.println(name+","+age+","+gender+","+id);
            }
            public void setPerson(String name,int age,boolean gender,int id) {
                this.name = name;
                this.age = age;
                this.gender = gender;
                this.id = id;
            }

            // 赋值对象
            public void getSystemP(int i){
         
                String name = s.next();
                int age =s.nextInt();
                Boolean gender = s.nextBoolean();
                setPerson(name,age,gender,0);
            }

            // 输出对象
            public void getOut(Person person){
                System.out.println("Person "+"[name="+person.name+", age="+
                        person.age+", gender="+person.gender+", id="+person.id+"]");
            }

            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 isGender() {
                return gender;
            }

            public void setGender(boolean gender) {
                this.gender = gender;
            }

            public int getId() {
                return id;
            }

            public void setId(int id) {
                this.id = id;
            }
        }
        
        // 输入数量
        int n = s.nextInt();
        // new对象
        Person person = new Person();
        // 定义接口引入
        List<Person> personlList  = new ArrayList<>();
        int i=0;
        for(;i<n;i++){
            // 赋值 id可以自增但是题目不需要
            person = new Person();
            person.getSystemP(i);
            // 添加新对象
            personlList.add(person);
        }
        i = personlList.size()-1;
        for(;i>=0;i--){
            person=personlList.get(i);
            person.getOut(person);
        }
        Scanner ss = new Scanner(System.in);
        person = new Person();
        person.NoParameterConstructor();
        person.getOut(person);
    }
}

7-2 jmu-Java-03面向对象基础-02-构造方法与初始化块

import java.util.Scanner;
import java.util.ArrayList;
import java.util.List;


public class Main {
    public static class Person{
        // 人员姓名
        private String name;
        // 年龄
        private int age;
        // 性别  true 男 / false女
        private boolean gender;
        // 编号
        private int id;
        static int ss=0;
        {
            this.id = this.ss;
            System.out.println("This is initialization block, id is "+id);
            this.ss = this.ss + 1;
        }
        static {
            System.out.println("This is static initialization block");
        }
        // 构造打印
        public void Person(){
            System.out.println("This is constructor");
        }

        // 无参构造器
        public void NoParameterConstructor() {
            System.out.println("This is constructor");
            System.out.println(name+","+age+","+gender+","+id);
        }
        public void Person(String name,int age,boolean gender) {
            this.name = name;
            this.age = age;
            this.gender = gender;

        }



        // 输出对象
        public void getOut(Person person){
            System.out.println("Person "+"[name="+person.name+", age="+
                    person.age+", gender="+person.gender+", id="+person.id+"]");
        }



        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 isGender() {
            return gender;
        }

        public void setGender(boolean gender) {
            this.gender = gender;
        }

        public int getId() {
            return id;
        }

        public void setId(int id) {
            this.id = id;
        }
    }
    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        // 输入数量
        int n = s.nextInt();
        // new对象
        Person person;
        // 定义接口引入
        List<Person> personlList  = new ArrayList<>();
        int i=0;
        for(;i<n;i++){
            // 赋值 id可以自增
            person = new Person();
            String name = s.next();
            int age =s.nextInt();
            Boolean gender = s.nextBoolean();
            person.Person(name,age,gender);
            // 添加新对象
            personlList.add(person);
        }
        i = personlList.size()-1;
        for(;i>=0;i--){
            person=personlList.get(i);
            person.getOut(person);
        }

        person = new Person();
        person.NoParameterConstructor();
        person.getOut(person);
    }



}

7-3 定义类

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
                Scanner in = new Scanner(System.in);
                int a,b,c,d,e;
                a = in.nextInt();
                b = in.nextInt();
                c = in.nextInt();
                d = in.nextInt();
                e = in.nextInt();
                RR rr = new RR();
                double dd = rr.fun(a,b,c,d,e);
                
                System.out.printf("%.2f",dd);
           
    }
}
class RR{
    public double fun(double a,double b,double c,double d,double e){
        double ss = a + b + c +d + e;
        ss = ss / 5;
        return ss;
    }
    

}

7-4 构造方法

public class Main {
    public Main(){
        System.out.println("构造方法一被调用了");
    }
    public Main(int x){
        this();
        System.out.println("构造方法二被调用了");
    }
    public Main(boolean b){
        this(1);
        System.out.println("构造方法三被调用了");
    }
    public static void main(String[] args) {
        new Main(true);
    }
}

7-5 类的定义与对象使用

import java.util.Scanner;
import java.util.ArrayList;
import java.util.List;

class Student{
    // 人员姓名
    private String name;
    // 年龄
    private int age;
    // 学号
    private String id;
    // 是否年龄符合要求7-60岁 true  符合  false  不符合
    private boolean show;

    public void  setStudent(String id,String name,int age){
        this.show = true;
        if(age<7||age>60){
            this.show = false;
        }
        this.name = name;
        this.age = age;
        this.id = id;

    }

    public void getStudent(Student s){
        if(s.show)
            System.out.println(s.name+" "+s.id+" "+s.age);
        else
            System.out.println("bad");
    }

}
public class Main {

    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        // 输入数量
        int n = s.nextInt();
        // 定义接口引入
        List<Student> StudentlList  = new ArrayList<>();
        Student student;
        int i = 0;
        for(;i<n;i++){
            // 赋值 id可以自增但是题目不需要
            student = new Student();
            student.setStudent(s.next(),s.next(),s.nextInt());
            // 添加新对象
            StudentlList.add(student);
        }
        i=0;
        for(;i<StudentlList.size();i++){
            Student s1 = StudentlList.get(i);
            s1.getStudent(s1);
        }
    }
}

7-6 定义类与创建对象

import java.util.Scanner;
import java.util.ArrayList;
import java.util.List;

class Student{
    // 人员姓名
    private String name;
    // 年龄
    private int age;
    // 学号
    private String id;
    // 是否年龄符合要求7-60岁 true  符合  false  不符合
    private boolean show;

    public void  setStudent(String name,int age){
        this.show = true;
        if(age<7||age>60){
            this.show = false;
        }
        this.name = name;
        this.age = age;

    }

    public void getStudent(Student s){

        if(s.show)
            System.out.println("this person is "+s.name+",her age is "+s.age);
        else
            System.out.println("bad");
    }

}
public class Main {

    public static void main(String[] args) {

        // 定义接口引入
        List<Student> StudentlList  = new ArrayList<>();
        Student student;

        student = new Student();
        student.setStudent("lili",19);
        StudentlList.add(student);
        student = new Student();
        student.setStudent("lucy",20);
        StudentlList.add(student);

        int i=0;
        for(;i<StudentlList.size();i++){
            Student s1 = StudentlList.get(i);
            s1.getStudent(s1);
        }
    }
}

7-7 学生类设计

import java.util.Scanner;
import java.util.ArrayList;
import java.util.List;

class Student{
    // 人员姓名
    private String name;
    // 年龄
    private int age;
    // 学号
    private String id;
    // 是否年龄符合要求7-60岁 true  符合  false  不符合
    private boolean show;

    public void  setStudent(String name,int age){
        this.show = true;
        if(age<7||age>60){
            this.show = false;
        }
        this.name = name;
        this.age = age;

    }

    public void getStudent(Student s){

        if(s.show)
            System.out.println("this person is "+s.name+",her age is "+s.age);
        else
            System.out.println("bad");
    }


    public String getName() {
        return name;
    }

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

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        if(age<=6)this.age=7;
        else this.age = age;
    }

    public String getId() {
        return id;
    }

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

    public boolean isShow() {
        return show;
    }

    public void setShow(boolean show) {
        this.show = show;
    }

    public void wucan(){
        name = "无名";
        age = 7;
        System.out.println("无参构造方法");
    }
    public  void display(){
        System.out.println("name:"+name+",age:"+age);
    }
}
public class Main {

    public static void main(String[] args) {

        // 定义接口引入
        List<Student> StudentlList  = new ArrayList<>();
        Student student;

        student = new Student();

        student.wucan();
        student.display();
        Scanner ss = new Scanner(System.in);
        student.setName(ss.next());
        student.setAge(ss.nextInt());
        student.display();

    }
}

7-8 学生类-构造函数

import java.util.Scanner;
class Main {  
    private String name;  
    private String sex;  
    private int age;  
    public Main(String name, String sex, int age) {  
        this.name = name;  
        this.sex = sex;  
        this.age = age;  
    }  
    @Override  
    public String toString() {  
        return "Student [name='" + name + "', sex='" + sex + "', age=" + age + "]";  
    }  
    public String getName() {  
        return name;  
    }  
    public void setName(String name) {  
        this.name = name;  
    }  
    public String getSex() {  
        return sex;  
    }  
    public void setSex(String sex) {  
        this.sex = sex;  
    }  
    public int getAge() {  
        return age;  
    }  
    public void setAge(int age) {  
        this.age = age;  
    }  
    public static void main(String[] args) {  
        Scanner scanner = new Scanner(System.in);  
        String name = scanner.next();  
        int age = scanner.nextInt();  
        String sex = scanner.next();  
        Main student = new Main(name, sex, age);  
        System.out.println(student);  
        scanner.close();  
    }  
}

7-9 教师类

import java.util.Objects;
import java.util.Scanner;
import java.util.ArrayList;
import java.util.List;

class Teacher{
    // 教师编号
   private int no;
   String name;
   int age;
   // 所属学院
   String seminary;


    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        Teacher teacher = (Teacher) o;
        return no == teacher.no;
    }

    @Override
    public String toString() {
        return
                "no: " + no +
                        ", name:" + name +
                        ", age: " + age +
                        ", seminary: " + seminary;
    }


    public void setTeacher(int no, String name, int age, String seminary) {
        this.no = no;
        this.name = name;
        this.age = age;
        this.seminary = seminary;
    }


    public int getNo() {
        return no;
    }

    public void setNo(int no) {
        this.no = no;
    }

    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 getSeminary() {
        return seminary;
    }

    public void setSeminary(String seminary) {
        this.seminary = seminary;
    }
}
public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        List<Teacher> teacherList  = new ArrayList<>();
        Teacher teacher;
        for(int i=0;i<2;i++){
            teacher = new Teacher();
            teacher.setNo(sc.nextInt());
            teacher.setName(sc.next());
            teacher.setAge(sc.nextInt());
            teacher.setSeminary(sc.next());
            teacherList.add(teacher);
            System.out.println(teacher.toString());
        }
        System.out.println(teacherList.get(0).equals(teacherList.get(1)));

    }
}

7-10 统计学生年龄异常的人数。

import java.util.Objects;
import java.util.Scanner;
import java.util.ArrayList;
import java.util.List;

class Student{
   String name;
   int age;
   // 是否符合要求 true 符合/ false 不符合
    Boolean show;

    public String getName() {
        return name;
    }

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

    public int getAge() {
        return age;
    }

    public Boolean setAge(int age) {
        if(age>0)this.show = true;
        else this.show = false;
        this.age = age;
        return this.show;
    }
    public void getFlasN(){
        if(!show) System.out.println(name);
    }
}
public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        List<Student> studentList  = new ArrayList<>();
        Student student;
        // 记录符合要求的人数
        int num=0;
        for(int i=0;i<5;i++){
            student = new Student();
            student.setName(sc.next());
            if(student.setAge(sc.nextInt()))num+=1;
            studentList.add(student);
        }
        if(num==5){
            System.out.println("right");
        }else if(num==0){
            System.out.println("all wrong");
        }else{
            System.out.println(5-num);
            for(Student s:studentList){
                s.getFlasN();
            }
        }


    }
}

7-11 sdut-oop-4-求圆的面积（类与对象）

import java.util.Objects;
import java.util.Scanner;
import java.util.ArrayList;
import java.util.List;
import java.lang.Math;
class Circle{
    private int radius;
    public void wucan(){
        radius = 2;
        System.out.println("This is a constructor with no para.");
    }
    public void youcan(int i){
        if(i<=0)i=2;
        this.radius = i;
        System.out.println("This is a constructor with para.");

    }

    public int getRadius() {
        return radius;
    }

    public void setRadius(int radius) {
        if(radius<=0)radius=2;
        this.radius = radius;
    }
    public void getArea(){
        double mj;
        mj = radius*radius*Math.PI;
        System.out.printf("%.2f",mj);
      
    }

    @Override
    public String toString() {
        return "Circle [" +
                "radius=" + radius +
                ']';
    }
}
public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        List<Circle> circleList  = new ArrayList<>();
        Circle circle;
        circle = new Circle();
        circle.wucan();
        System.out.println(circle.toString());
        circle.getArea();
          System.out.println("");
        circle.wucan();
        System.out.println(circle.toString());
        circle.getArea();
  System.out.println("");
        circle.setRadius(sc.nextInt());
        System.out.println(circle.toString());
        circle.getArea();
          System.out.println("");
        circle.youcan(sc.nextInt());
        System.out.println(circle.toString());
        circle.getArea();



//        circle.youcan(sc.nextInt());




    }
}

7-12 设计一个矩形类Rectangle

import java.util.Objects;
import java.util.Scanner;
import java.util.ArrayList;
import java.util.List;
import java.lang.Math;
class Rectangle{
    private double width;
    private double length;

    public void setStart(){
        this.width = 0;
        this.length =0;

    }
    public void setXY(double a, double b){
        this.width = a;
        this.length =b;
    }
    public double getArea(){
        return width*length;
    }
    public double getPerimeter(){
        return 2*(width+length);
    }

    public double getWidth() {
        return width;
    }

    public void setWidth(double width) {
        this.width = width;
    }

    public double getLength() {
        return length;
    }

    public void setLength(double length) {
        this.length = length;
    }
}
public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        Rectangle s1 = new Rectangle();
        s1.setWidth(sc.nextDouble());
        s1.setLength(sc.nextDouble());
        System.out.println("面积为"+s1.getArea());
        System.out.print("周长为"+s1.getPerimeter());
//        circle.youcan(sc.nextInt());




    }
}

7-13 学生选课信息管理

import java.util.Objects;
import java.util.Scanner;
import java.util.ArrayList;
import java.util.List;
import java.lang.Math;
// 学生
class Student{
    // 学号
    private String stuID;
    private String stuName;
    // 学生对象的数量
    static  int stuNum =0;
    Student(){
        System.out.println("学生类无参构造方法");
        stuNum++;
    }
    Student(String stuID,String stuName){
        System.out.println("学生类有参构造方法");
        this.stuID=stuID;
        this.stuName=stuName;
        stuNum++;
    }


    public String getStuID() {
        return stuID;
    }

    public void setStuID(String stuID) {
        this.stuID = stuID;
    }

    public String getStuName() {
        return stuName;
    }

    public void setStuName(String stuName) {
        this.stuName = stuName;
    }
}
// 课程
class Course{
    // 课程编号
    private String cID;
    // 课程名字
    private String cName;
    // 课程对象的数量
    static int cNum;

    Course(){
        System.out.println("课程类无参构造方法");
        cNum++;
    }
    Course(String cID,String cName){
        System.out.println("课程类有参构造方法");
        this.cID=cID;
        this.cName=cName;
        cNum++;
    }

    public String getcID() {
        return cID;
    }

    public void setcID(String cID) {
        this.cID = cID;
    }

    public String getcName() {
        return cName;
    }

    public void setcName(String cName) {
        this.cName = cName;
    }
}
// 选课
class  Schedule{
    private List<Student> stuList = new ArrayList<>();
    private List<Course> cList= new ArrayList<>();
    // 学生选课总数
    static int schNum = 0;

    public void addCourse(Student stu,Course course){
        stuList.add(stu);
        cList.add(course);
        schNum++;
    }

    public void displayCourse(){
        System.out.print("学生选课情况如下：");
        for (int i = 0; i < stuList.size(); i++) {
            System.out.println();
            System.out.printf("%s\t%s\t%s\t%s",
                    stuList.get(i).getStuID(),
                    stuList.get(i).getStuName(),
                    cList.get(i).getcID(),
                    cList.get(i).getcName());
        }
    }




}
public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int type = sc.nextInt();
        switch(type){
            case 1: test1(sc);break;
            case 2: test2(sc);break;
            case 3: test3(sc);break;
            case 4: test4(sc);
        }
    }
    //test方法为（4）中情况，见上述说明
    public static void test1(Scanner sc) {
        Student student1 = new Student();
        student1.setStuID(sc.next());
        student1.setStuName(sc.next());
        Student student2 = new Student();
        student2.setStuID(sc.next());
        student2.setStuName(sc.next());
        System.out.print("学生总数为："+Student.stuNum);

    }
    public static void test2(Scanner sc) {
        Course course1 = new Course();
        course1.setcID(sc.next());
        course1.setcName(sc.next());
        Course course2 = new Course();
        course2.setcID(sc.next());
        course2.setcName(sc.next());
        Course course3 = new Course();
        course3.setcID(sc.next());
        course3.setcName(sc.next());
        System.out.print("课程总数为："+Course.cNum);
    }

    public static void test3(Scanner sc) {
        Student student1 = new Student(sc.next(),sc.next());
        Course course1 = new Course();
        course1.setcID(sc.next());
        course1.setcName(sc.next());
        Course course2 = new Course();
        course2.setcID(sc.next());
        course2.setcName(sc.next());

        Schedule schedule = new Schedule();
        schedule.addCourse(student1,course1);
        schedule.addCourse(student1,course2);
        System.out.println("学生选课的总数为："+Schedule.schNum);
        schedule.displayCourse();
    }
    public static void test4(Scanner sc) {
        Student student1 = new Student(sc.next(),sc.next());
        Student student2 = new Student(sc.next(),sc.next());
        Student student3 = new Student(sc.next(),sc.next());

        Course course1 = new Course(sc.next(),sc.next());
        Course course2 = new Course(sc.next(),sc.next());
        Course course3 = new Course(sc.next(),sc.next());
        Course course4 = new Course(sc.next(),sc.next());

        Schedule schedule = new Schedule();
        schedule.addCourse(student1,course2);
        schedule.addCourse(student1,course3);

        schedule.addCourse(student2,course1);

        schedule.addCourse(student3,course1);
        schedule.addCourse(student3,course2);
        schedule.addCourse(student3,course4);
        System.out.println("学生总数为："+Student.stuNum);
        System.out.println("课程总数为："+Course.cNum);
        System.out.println("学生选课的总数为："+Schedule.schNum);
        schedule.displayCourse();

    }
}

7-14 成绩计算-2-关联类

import java.util.Scanner;
import java.text.DecimalFormat;
class Score {
    private int pingshi;
    private int qimo;

    public Score(int pingshi, int qimo) {
        this.pingshi = pingshi;
        this.qimo = qimo;
    }
    public Score(){
    }
    public int getPingshi() {
        return pingshi;
    }
    public int getQimo() {
        return qimo;
    }
    public int getScore() {
        return (int) ((pingshi * 0.4) + (qimo * 0.6));
    }
}
class Student
{
    private String num;
    private String name;
    private Score  yuwen;
    private Score  shuxue;
    private Score  wuli;
    public Student() {
    }
    public Student(String num, String name, Score yuwen, Score shuxue,Score wuli) {
        this.num = num;
        this.name = name;
        this.yuwen = yuwen;
        this.shuxue = shuxue;
        this.wuli = wuli;
    }
    public  void setNum(String num)
    {
        this.num =num;
    }
    public String getNum() {
        return num;
    }
    public  void setName(String name)
    {
        this.name = name;
    }
    public String getName() {
        return name;
    }
    public  void setYuwen(Score yuwen)
    {
        this.yuwen = yuwen;
    }
    public Score getYuwen() {
        return yuwen;
    }
    public  void setShuxue(Score shuxue)
    {
        this.shuxue = shuxue;
    }
    public Score getShuxue() {
        return shuxue;
    }
    public  void setWuli(Score wuli)
    {
        this.wuli = wuli;
    }
    public Score getWuli() {
        return wuli;
    }
    public double qimoa(){
        return yuwen.getScore()+shuxue.getScore()+wuli.getScore();
    }
    public double zuizhong(int i){
        double all1 = yuwen.getPingshi()+shuxue.getPingshi()+wuli.getPingshi();
        double all2 = yuwen.getQimo()+shuxue.getQimo()+wuli.getQimo();
        double all3 = yuwen.getScore()+shuxue.getScore()+wuli.getScore();
        double lzy = 0;
        if(i==0) {
            lzy = (double)(all1/(double)3);
            return lzy;
        }
        else if(i==1) {
            lzy = (double)(all2/(double)3);
            return lzy;
        }
        else {
            lzy = (double)(all3/(double)3);
            return lzy;
        }
    }
}
public class Main {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        Student[] student = new Student[3];
        Score []score = new Score[3];
        String asd;
        for(int i=0;i<3;i++){
            for(int j=0;j<3;j++) {
                student[i] =new Student();
                student[i].setNum(input.next());
                student[i].setName(input.next());
                asd = input.next();
                Score chengji = new Score(input.nextInt(),input.nextInt());
                score[j] = chengji;
                student[i].setYuwen(score[0]);
                student[i].setShuxue(score[1]);
                student[i].setWuli(score[2]);
            }
        }
        for(int j=0;j<3;j++)
            if(j<2) System.out.println(student[j].getNum()+" "+student[j].getName()+" "+(int)student[j].qimoa()+" "+String.format("%.2f",student[j].zuizhong(0))+" "+String.format("%.2f",student[j].zuizhong(1))+" "+String.format("%.2f",student[j].zuizhong(2)));
            else System.out.print(student[j].getNum()+" "+student[j].getName()+" "+(int)student[j].qimoa()+" "+String.format("%.2f",student[j].zuizhong(0))+" "+String.format("%.2f",student[j].zuizhong(1))+" "+String.format("%.2f",student[j].zuizhong(2)));
    }
}

7-15 定义商品类，封装成员变量，输出对象

import java.util.Objects;
import java.util.Scanner;
import java.util.ArrayList;
import java.util.List;
import java.lang.Math;
class  Shops{
    private String shopId;
    private String shopName;
    private Double shopMoney;

    @Override
    public String toString() {
        return
                shopId + ',' + shopName + ','+ shopMoney;
    }

    Shops(String shopId, String shopName, Double shopMoney){
        this.shopId =shopId;
        this.shopName = shopName;
        this.shopMoney = shopMoney;
    }
    public String getShopId() {
        return shopId;
    }

    public void setShopId(String shopId) {
        this.shopId = shopId;
    }

    public String getShopName() {
        return shopName;
    }

    public void setShopName(String shopName) {
        this.shopName = shopName;
    }

    public Double getShopMoney() {
        return shopMoney;
    }

    public void setShopMoney(Double shopMoney) {
        this.shopMoney = shopMoney;
    }
}
public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        Shops shops = new Shops(sc.next(),sc.next(),sc.nextDouble());
        System.out.print(shops.toString());
    }
}

7-16 设计一个BankAccount类

import java.util.Objects;
import java.util.Scanner;
import java.util.ArrayList;
import java.util.List;
import java.lang.Math;
class  BankAccount{
    // 账户余额。
    private int balance;
    BankAccount(){
        this.balance = 0;
    }
    BankAccount(int balance){
        this.balance = balance;
    }

    public int getBlance(){
        return this.balance;
    }

    public void withdraw(int money){
        this.balance -= money;
    }
    public void deposit(int money){
        this.balance += money;
    }
}
public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        BankAccount bank = new BankAccount();
        bank.deposit(sc.nextInt());
        System.out.println(bank.getBlance());
        bank.withdraw(sc.nextInt());
        System.out.println(bank.getBlance());
        bank.deposit(sc.nextInt());

        System.out.println(bank.getBlance());
    }
}
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