15. demo1 - (5) CustomerDemo ( 상수 선언 )

package demo1;
 
public class Grade {
    
//    public static final String VIP = "vip";
//    public static final String GOLD = "gold";
//    public static final String SILVER = "silver";
//    public static final String BRONZE = "bronze";
 
    public static final int VIP = 0;
    public static final int GOLD = 1;
    public static final int SILVER = 2;
    public static final int BRONZE = 3;
    
}
 

package demo1;
 
public class Customer {
    
    private String name;
    private int grade;    // VIP, Gold, Silver, Bronze
    
    public Customer() {
        
    }
    
    public Customer(String name, int grade) {
        this.name = name;
        this.grade = grade;
    }
    
    public String getName() {
        return name;
    }
    
    public int getGrade() {
        return grade;
    }
    
}
 

package demo1;
 
public class CustomerDemo {
 
    public static void main(String[] args) {
 
//        Customer customer1 = new Customer("홍길동", 0); // 가독성 좋지않음
        Customer customer1 = new Customer("홍길동", Grade.VIP); // 가독성 증가
        Customer customer2 = new Customer("김유신", Grade.SILVER);
        
        // 상수의 단점
        // 지정된 상수 외의 값이 대입되는 것을 컴파일 시에 체크 할 수 없음
//        Customer customer5 = new Customer("강감찬", 100);
 
        System.out.println(getPoint1(customer1, 10000));
        System.out.println(getPoint1(customer2, 10000));
        System.out.println();
        System.out.println(getPoint2(customer1, 10000));
        System.out.println(getPoint2(customer2, 10000));
 
    }
 
    public static int getPoint1(Customer customer, int orderPrice) {
        
        int point = 0;
        if (customer.getGrade() == 0) {
            point = (int) (orderPrice * 0.05);
        } else if (customer.getGrade() == 1) {
            point = (int) (orderPrice * 0.03);
        } else if (customer.getGrade() == 2) {
            point = (int) (orderPrice * 0.02);
        } else if (customer.getGrade() == 3) {
            point = (int) (orderPrice * 0.01);
        }
        return point;
        
    }
 
    public static int getPoint2(Customer customer, int orderPrice) {
 
        int point = 0;
        if (customer.getGrade() == Grade.VIP) {
            point = (int) (orderPrice * 0.05);
        } else if (customer.getGrade() == Grade.GOLD) {
            point = (int) (orderPrice * 0.03);
        } else if (customer.getGrade() == Grade.SILVER) {
            point = (int) (orderPrice * 0.02);
        } else if (customer.getGrade() == Grade.BRONZE) {
            point = (int) (orderPrice * 0.01);
        }
        return point;
        
    }
 
}