src/main/java/com/example/g8backend/dto/ApiResponse.java

package com.example.g8backend.dto;

public class ApiResponse<T> {
    private int code;
    private String message;
    private T data;

    public ApiResponse() {}

    public ApiResponse(int code, String message, T data) {
        this.code = code;
        this.message = message;
        this.data = data;
    }

    public static <T> ApiResponse<T> success(T data) {
        return new ApiResponse<>(200, "Success", data);
    }

    public static <T> ApiResponse<T> success(String message, T data) {
        return new ApiResponse<>(200, message, data);
    }

    public static <T> ApiResponse<T> message(String message) {
        return new ApiResponse<>(200, message, null);
    }

    public static <T> ApiResponse<T> error(int code, String message) {
        return new ApiResponse<>(code, message, null);
    }

    // Getters and Setters 略，也可使用 Lombok 注解
}