[자바]earnings()와 toString()메소드 완성시키기

- 지식인을 참고한 것이 있지만 이번에 toString과 super클래스의 용도를 알수 있었던 중요한 코딩이였습니다.

- 비어있는 earnings와 toString에 적합한 코딩문을 넣는 문제였습니다.

 

package 연습;

class Employee{
	private String name;
	private String id;
	static private int count = 0;

	public Employee(String name, String id){
		this.name = name;
		this.id = id;
		count++;
	}
    
	public double earnings() {
		return 0;
	}
    
	public String toString(){
		return name + "(" + id + ")";
	}

	public static int getCount(){
		return count;
	}
}

​

class SalariedEmployee extends Employee {
	private double monthlySalary;
	public SalariedEmployee(String name, String id, double salary) {
		super(name, id);
		monthlySalary = salary;
	}

	public double earnings() {
		return monthlySalary;
	}

	public String toString() {
		return super.toString()+"\nmonthly salary: "+ monthlySalary;
	}
}

class HourlyEmployee extends Employee {
	private double wage;
	private double hours;

	public HourlyEmployee(String name, String id, double wage, double hours){
		super(name, id);
		this.wage = wage;
		this.hours = hours;
	}

	public double earnings(){
		return wage*hours;
	}

	public String toString(){
		return super.toString()+"\nwage: "+wage+"\n"+"hours: "+hours;
	}
}

class CommissionEmployee extends Employee{
	private double grossSales;
	private double commissionRate;
    
	public CommissionEmployee(String name, String id, double sales, double rate) {
		super(name, id);
		grossSales = sales;
		commissionRate = rate;
	}

	public double earnings() {
		return grossSales * commissionRate;
	}

	public String toString() {
		return super.toString()+"\ngross sales: "+grossSales+"\n"+"commission rate: "+commissionRate;
	}
}

class BasePlusCommissionEmployee extends CommissionEmployee{
	private double baseSalary;
	public BasePlusCommissionEmployee(String name, String id, double sales, double rate, double salary) {
		super(name, id, sales, rate);
		baseSalary = salary;
	}

	public double earnings(){
		return super.earnings()+baseSalary;
	}

	public String toString(){
		return super.toString()+"\nbaseSalary: "+baseSalary;
	}

}

public class EmployeeTest {
	public static void main(String[] args) {
		Employee arr[] = new Employee[4];
		arr[0] = new SalariedEmployee("Smith", "s1111", 300);
		arr[1] = new HourlyEmployee("Karen", "h2222", 1, 160);
		arr[2] = new CommissionEmployee("Jones", "c3333", 2000, 0.1);
		arr[3] = new BasePlusCommissionEmployee("Lewis", "b4444", 2000, 0.06, 100);

		double sum = 0.0;
		for (Employee e : arr) {
			System.out.println(e);
			System.out.println("payment: "+e.earnings());
			System.out.println();
			sum+=e.earnings();
		}

		System.out.println("Total employees: "+Employee.getCount());
		System.out.println("Total payment: "+sum);
	}

}