CurrencyDTO – Lombok Usage Guide

This document explains how to use Lombok annotations (@Builder, @AllArgsConstructor, @Getter, @Setter) with the CurrencyDTO class and shows alternatives without Lombok.

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DTO Definition

package wallet.api.money.dto;

import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Getter;
import lombok.Setter;

@Getter
@Setter
@AllArgsConstructor
@Builder
public class CurrencyDTO {
    private String fromCurrency;
    private String toCurrency;
    private Double amount;
}

A DTO (Data Transfer Object) is used to transfer data between layers such as controller, service, and client. It should not contain business logic.

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1. Usage with @Builder

@Builder makes object creation more readable and safer. It is especially useful for DTOs with multiple fields.

CurrencyDTO dto = CurrencyDTO.builder()
        .fromCurrency("USD")
        .toCurrency("EUR")
        .amount(100.0)
        .build();

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2. Usage with @AllArgsConstructor

@AllArgsConstructor generates a constructor that includes all fields.

CurrencyDTO dto = new CurrencyDTO("USD", "EUR", 100.0);

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3. Usage Without Lombok

When Lombok is not used, all boilerplate code must be written manually.

public class CurrencyDTO {

    private String fromCurrency;
    private String toCurrency;
    private Double amount;

    public CurrencyDTO() {
    }

    public CurrencyDTO(String fromCurrency, String toCurrency, Double amount) {
        this.fromCurrency = fromCurrency;
        this.toCurrency = toCurrency;
        this.amount = amount;
    }

    public String getFromCurrency() {
        return fromCurrency;
    }

    public void setFromCurrency(String fromCurrency) {
        this.fromCurrency = fromCurrency;
    }

    public String getToCurrency() {
        return toCurrency;
    }

    public void setToCurrency(String toCurrency) {
        this.toCurrency = toCurrency;
    }

    public Double getAmount() {
        return amount;
    }

    public void setAmount(Double amount) {
        this.amount = amount;
    }
}

Usage:

CurrencyDTO dto = new CurrencyDTO();
dto.setFromCurrency("USD");
dto.setToCurrency("EUR");
dto.setAmount(100.0);

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