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15/04/2021 11:40:32 PM

Minh họa cách cài đặt lớp trừu tượng trong Java

import java.io.IOException;

import java.util.*;

//Tạo lop trừu tượng Employee

abstract class Employee{

              String ID,name;

              float salary;

//Constructor Employee

              Employee(){

                             this.ID ="";

                             this.name="";

                             this.salary = 0;

              }

//abstract method calculateSalary

              abstract float calculateSalary();

              void input(){

                             Scanner objSc = new Scanner(System.in);

                             System.out.print("Nhap ID:");

                             ID = objSc.nextLine();

 

                             System.out.print("Nhap name:");

                             name = objSc.nextLine();

                            

                             System.out.print("Nhap luong:");

                             salary = objSc.nextFloat();

              }

              void output(){

                             System.out.println("ID:"+ID);

                             System.out.println("Name:"+name);

                             System.out.println("Salary:"+salary);

              }

}

class RegularEmployee extends Employee{

              float salaryGrading,benefitGrading ;

//constructor RegularEmployee()

              RegularEmployee(){

                             this.salaryGrading=0;

                             this.benefitGrading =0;

              }

              @Override

              float calculateSalary() {

                             salary =1000000*(1+ salaryGrading + benefitGrading);

                             return salary;

              }

              void input(){

                             //goi input() tu lop cha

                             super.input();

                             Scanner objSc = new Scanner(System.in);

                            

                             System.out.print("Nhap salaryGrading:");

                             salaryGrading = objSc.nextFloat();

                            

                             System.out.print("Nhap benefitGrading:");

                             benefitGrading = objSc.nextFloat();

              }

}

class ContractStaff extends Employee{

              float wage,workday,excessHoursGrading;

             

              //constructor ContractStaff

              ContractStaff(){

                             this.wage = 0;

                             this.workday=0;

                             this.excessHoursGrading=0;

              }

              void input(){

                             //Goi input() tu lop cha

                             super.input();

                             Scanner objSc = new Scanner(System.in);

                             System.out.print("Nhap wage:");

                             wage = objSc.nextFloat();

                            

                             System.out.print("Nhap workday:");

                             workday = objSc.nextFloat();

                            

                             System.out.print("Nhap excessHoursGrading:");

                             excessHoursGrading = objSc.nextFloat();

              }

              float calculateSalary() {

                             salary = wage * workday *(1+ excessHoursGrading);

                             return salary;

              }

}

class EmployeeList{

              Employee empList[] = new Employee[100];

              int n=0;

              char chon,loai;

              void inputEmployee() throws IOException{

                             do

                             {

                                           System.out.println("Bien che hay Hop dong (B/H)?");

                                           loai = (char) System.in.read();

                                           if (loai=='B' || loai=='b')

                                                          empList[n]=new RegularEmployee();      

                                           else

                                                          empList[n]=new ContractStaff();

                                           System.in.skip(loai);

                                           empList[n++].input();

                                           System.out.println("Tiep tuc (C/K)?");

                                           chon = (char) System.in.read();

                                           System.in.skip(chon);

                                           if ((n==100)||(chon=='K')||(chon=='k'))

                                                          break;

                             }

                             while (true);

              }

             

              void outputEmployee(){

                             for(int i=0;i

                                           System.out.println("ID "+empList[i].ID);

                                           System.out.println("Luong "+empList[i].salary);

                             }

              }

}

public class demo {

              public static void main(String[] args) throws IOException {

                             EmployeeList objEmp = new EmployeeList();

                             objEmp.inputEmployee();

                             objEmp.outputEmployee();

              }

}

Trương Đình Huy