4.3 jmu-Java-03 inherited coverage of object-oriented -06- Exercises -Person, Student, Employee, Company (20 points)

Others 2019-12-26 14:05:22 views: null
4.3 jmu-Java-03 inherited coverage of object-oriented -06- Exercises -Person, Student, Employee, Company (20 points)
 

Person defined abstract class, Student category, Company category, Employee class.

Person class attributes : String name, int age, boolean gender
Person class methods :

public Person(String name, int age, boolean gender); public String toString(); //返回"name-age-gender"格式的字符串 public boolean equals(Object obj);//比较name、age、gender,都相同返回true,否则返回false
 

Student class inherits from Personthe property: String stuNo, String clazz
methods of the Student class:

//建议使用super复用Person类的相关有参构造函数
public Student(String name, int age, boolean gender, String stuNo, String clazz); public String toString(); //返回 “Student:person的toString-stuNo-clazz”格式的字符串 public boolean equals(Object obj);//首先调用父类的equals方法,如果返回true，则继续比较stuNo与clazz。
 

Company class attributes: String name
Company class method:

public Company(String name); public String toString(); //直接返回name public boolean equals(Object obj);//name相同返回true
 

Employee class inherits from Personthe property: Company company, double salary
Employee class methods:

//建议使用super复用Person类的相关有参构造函数
public Employee(String name, int age, boolean gender, double salary, Company company); public String toString(); //返回"Employee:person的toString-company-salary"格式的字符串 public boolean equals(Object obj);//首先调用父类的equals方法,如果返回true。再比较company与salary。 //比较salary属性时，使用DecimalFormat df = new DecimalFormat("#.#");保留1位小数
 

Write equals method IMPORTANT:

  1. Comparison of the Employee of company property. To be considered for the incoming nullcases. If the company is not null and passed in is null, returns false
  2. String comparison for all types of characters, but also consider nullthe situation.

prompt

  1. Sort using Collections.sort
  2. equals method to be thoughtful

main Method Description

  1. Student create several objects, Employee object.
    Enter s, then enter in turn name age gender stuNo clazzcreate a Student object .
    Enter e, then enter in turn name age gender salary companycreate an Employee object .
    Then the created object into List<Person> personList. Enter the other characters, the end of creation.
    Creating Note: For String type, if nullthe object is not created, and assigned null. For company property, or null if assigned null, otherwise the Company to create the appropriate object.

  2. The elements of personList achieved first by name in ascending order, the same name and then sorted in ascending order of age . Tip: You can use Comparable<Person>orComparator<Person>

  3. Accept input, if the input is exitthen returnexit the program. Otherwise, continue with the following steps.

  4. The personList the elements are placed according to the type and stuList empList. Note: Do not use the same object content into two lists (whether the same is based on the results of determination equals returns).

  5. Output string stuList, and then outputs stuList each object.

  6. Output string empList, and then outputs empList each object.

1-3As a test point 4-6to a test point

Sample input:

s zhang 23 false 001 net15
e wang 18 true 3000.51 IBM
s zhang 23 false 001 net15
e bo 25 true 5000.51 IBM
e bo 25 true 5000.52 IBM
e bo 18 true 5000.54 IBM
e tan 25 true 5000.56 IBM
e tan 25 true 5000.51 IBM
s wang 17 false 002 null
s wang 17 false 002 null
e hua 16 false 1000 null
s wang 17 false 002 net16
e hua 16 false 1000 null
e hua 18 false 1234 MicroSoft
!
continue
 

Sample output:

Employee:bo-18-true-IBM-5000.54
Employee:bo-25-true-IBM-5000.51
Employee:bo-25-true-IBM-5000.52
Employee:hua-16-false-null-1000.0
Employee:hua-16-false-null-1000.0
Employee:hua-18-false-MicroSoft-1234.0
Employee:tan-25-true-IBM-5000.56
Employee:tan-25-true-IBM-5000.51
Student:wang-17-false-002-null
Student:wang-17-false-002-null
Student:wang-17-false-002-net16
Employee:wang-18-true-IBM-3000.51
Student:zhang-23-false-001-net15
Student:zhang-23-false-001-net15
stuList
Student:wang-17-false-002-null
Student:wang-17-false-002-net16
Student:zhang-23-false-001-net15
empList
Employee:bo-18-true-IBM-5000.54
Employee:bo-25-true-IBM-5000.51
Employee:hua-16-false-null-1000.0
Employee:hua-18-false-MicroSoft-1234.0
Employee:tan-25-true-IBM-5000.56
Employee:tan-25-true-IBM-5000.51
Employee:wang-18-true-IBM-3000.51



import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
import java.util.Scanner;

class Person{         
        private String name = null;
        private int age = 0;
        private boolean gender = false; 
        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 Person(String n, int a, boolean g) {   
            this.name = n;
            this.age = a;
            this.gender = g;
        }
           

        @Override
        public String toString() {
            return  name+"-"+age+"-"+gender ;
        }

        @Override
        public boolean equals(Object obj) {
            if (this == obj)
                return true;
            if (obj == null)
                return false;
            if (getClass() != obj.getClass())
                return false;
            Person other = (Person) obj;
            if (age != other.age)
                return false;
            if (gender != other.gender)
                return false;
            if (name == null) {
                if (other.name != null)
                    return false;
            } else if (!name.equals(other.name))
                return false;
            return true;
        }
        
}
    
    class Student extends Person{
        String stuNo; String clazz;
        public Student(String n, int a, boolean g,String stuNo, String clazz) {
            super(n, a, g);
            this.stuNo=stuNo;
            this.clazz=clazz;
            // TODO Auto-generated constructor stub
        }
        @Override
        public String toString() {
            return super.toString()+"-"+stuNo+"-"+clazz ;
        }

        @Override
        public boolean equals(Object obj) {
            if (this == obj)
                return true;
            if (!super.equals(obj))
                return false;
            if (getClass() != obj.getClass())
                return false;
            Student other = (Student) obj;
            if (clazz == null) {
                if (other.clazz != null)
                    return false;
            } else if (!clazz.equals(other.clazz))
                return false;
            if (stuNo == null) {
                if (other.stuNo != null)
                    return false;
            } else if (!stuNo.equals(other.stuNo))
                return false;
            return true;
        }
        
    }
    class Company{
        String name;

        public Company(String name) {
            this.name = name;
        }

        @Override
        public String toString() {
            return name;
        }

        @Override
        public boolean equals(Object obj) {
            if (this == obj)
                return true;
            if (obj == null)
                return false;
            if (getClass() != obj.getClass())
                return false;
            Company other = (Company) obj;
            if (name == null) {
                if (other.name != null)
                    return false;
            } else if (!name.equals(other.name))
                return false;
            return true;
        }
        
        
    }
    class Employee extends Person{
         int age; boolean gender; double salary; Company company;


        public Employee(String n, int age, boolean gender, double salary, Company company) {
            super(n, age, gender);
            this.age = age;
            this.gender = gender;
            this.salary = salary;
            this.company = company;
        }


        @Override
        public String toString() {
            return super.toString()+"-"+company+"-"+salary;
        }
        DecimalFormat df = new DecimalFormat("#.#");
        @Override
        public boolean equals(Object obj) {
            if(super.equals(obj)==true) {
            Employee other = (Employee)obj;
            if(this.company.toString()==null||other.company.toString()==null) {
                return false;
            }
            String df1 = new DecimalFormat("#.#").format(this.salary);
            String df2 = new DecimalFormat("#.#").format(other.salary);
            if(this.company.toString().compareTo(other.company.toString())==0&&df1.compareTo(df2)==0) {
                return true;
            }
        }
        return false;
        }
        
        
    }
    public class Main{
        public static void main(String[] args) {
            String name;
             int age;
             boolean gender;
             String stuNo;
             String clazz;
             double salary; String company;
            Scanner sc=new Scanner(System.in);
            List<Person> personList=new ArrayList <>();
            ArrayList<Student> students = new ArrayList<Student>();
            ArrayList<Employee> employees = new ArrayList<Employee>();
                
            while(true) {
                String c =sc.next();
                if(c.compareTo("s")==0) {
                     name=sc.next();
                      age=sc.nextInt();
                      gender=sc.nextBoolean();
                      stuNo=sc.next();
                      clazz=sc.next();
                    Person stu=new Student(name ,age ,gender ,stuNo ,clazz);
                    personList.add(stu);
                }else if(c.compareTo("e")==0) {
                      name=sc.next();
                      age=sc.nextInt();
                      gender=sc.nextBoolean();
                      salary = sc.nextDouble();
                      company = sc.next();
                      Company company2 = new Company(company);
                      Person emp=new Employee(name, age, gender, salary, company2);
                      personList.add(emp);
             }else {
                    personList.sort(Comparator.comparing(Person::getName).thenComparing(Person::getAge));    
                    for (int i=0;i<personList.size();i++) {
                        if (personList.get(i) instanceof Student) {
                            System.out.println("Student:"+personList.get(i).toString());
                        int flag = 0;
                        for(int j=0;j<students.size();j++) {
                            if(students.get(j).equals(personList.get(i))) {
                                flag=1;
                                break;
                            }
                        }
                        
                        if(flag == 0) {
                            students.add((Student) personList.get(i));
                        }
                        }else {
                             System.out.println("Employee:"+personList.get(i).toString());
                                int flag = 0;
                                for(int j=0;j<employees.size();j++) {
                                    if(employees.get(j).equals(personList.get(i))) {
                                        flag = 1;
                                        break;
                                    }
                                }
                        if(flag == 0) {
                                    employees.add((Employee)personList.get(i));
                            }
                            
                        }
                    }
                    String tempString = sc.next();
                    if(tempString.compareTo("exit")==0||tempString.compareTo("return")==0) {
                        return;
                    }
                       System.out.println("stuList");
                        for(int i=0;i<students.size();i++) {
                            System.out.println("Student:"+students.get(i).toString());
                        }
                        System.out.println("empList");
                        for(int i=0;i<employees.size();i++) {
                            System.out.println("Employee:"+employees.get(i).toString());
                        }
            }
            }
        }
    }

 

 

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