문제 1

• CalculatorRequest

package com.group.libraryapp.dto.calculator.request;

public class CalculatorRequest {
    private final int num1;
    private final int num2;

    public CalculatorRequest(int num1, int num2) {
        this.num1 = num1;
        this.num2 = num2;
    }

    public int getNum1() {
        return num1;
    }

    public int getNum2() {
        return num2;
    }
}

• CalculatorResponse

package com.group.libraryapp.dto.calculator.response;

import com.group.libraryapp.dto.calculator.request.CalculatorRequest;

public class CalculatorResponse {
    private final int add;
    private final int minus;
    private final int multiply;

    public CalculatorResponse(CalculatorRequest request) {
        this.add = request.getNum1() + request.getNum2();
        this.minus = request.getNum1() - request.getNum2();
        this.multiply = request.getNum1() * request.getNum2();
    }

    public int getAdd() {
        return add;
    }

    public int getMinus() {
        return minus;
    }

    public int getMultiply() {
        return multiply;
    }
}

• Controller

 @GetMapping("/api/v1/calc")
    public CalculatorResponse calc(CalculatorRequest request){
        return new CalculatorResponse(request);
    }

문제2

• DayResponse

package com.group.libraryapp.dto.day.response;

import java.time.LocalDate;
import java.time.format.TextStyle;
import java.util.Locale;

public class DayResponse {

    private String dayOfTheWeek;

    public DayResponse(String dateString) {
        LocalDate date = LocalDate.parse(dateString);
        this.dayOfTheWeek = date.getDayOfWeek().getDisplayName(TextStyle.SHORT, Locale.US);
    }
    public String getDayOfTheWeek() {
        return dayOfTheWeek;
    }
}

• Controller

@GetMapping("/api/v1/day-of-the-week")
    public DayResponse dayOfTheWeek(@RequestParam String day){
        return new DayResponse(day);
    }

문제3