Java语法中如何避免魔法数字_magic number替代方案总结

if (user.getStatus() == 1) {
    // 激活用户逻辑
}

public class UserStatus {
    public static final int ACTIVE = 1;
    public static final int INACTIVE = 0;
    public static final int LOCKED = 2;
}

// 使用
if (user.getStatus() == UserStatus.ACTIVE) {
    // 激活用户逻辑
}

public enum OrderStatus {
    PENDING(1),
    CONFIRMED(2),
    SHIPPED(3),
    DELIVERED(4);

    private final int code;

    OrderStatus(int code) {
        this.code = code;
    }

    public int getCode() {
        return code;
    }

    public static OrderStatus fromCode(int code) {
        for (OrderStatus status : values()) {
            if (status.code == code) {
                return status;
            }
        }
        throw new IllegalArgumentException("Unknown status code: " + code);
    }
}

if (order.getStatus() == OrderStatus.CONFIRMED.getCode()) {
    // 处理确认订单
}

OrderStatus current = OrderStatus.fromCode(order.getStatus());
if (current == OrderStatus.CONFIRMED) {
    // ...
}

public class Constants {
    public static class HttpStatus {
        public static final int OK = 200;
        public static final int NOT_FOUND = 404;
        public static final int SERVER_ERROR = 500;
    }

    public static class Retry {
        public static final int MAX_ATTEMPTS = 3;
        public static final long TIMEOUT_MS = 5000;
    }
}

if (responseCode == Constants.HttpStatus.NOT_FOUND) {
    handleNotFound();
}

// 0: 成功, 1: 用户不存在, 2: 密码错误
int result = login(username, password);
if (result == 0) {
    // 登录成功
}