Java实现用位运算维护状态码

public class OrderStatus {

    private static final int CREATED = 1;   // 0001
    private static final int PAID = 2;      // 0010
    private static final int SHIPPED = 4;   // 0100
    private static final int COMPLETED = 8; // 1000

    private int status;

    public OrderStatus() {
        this.status = CREATED; // 默认状态为已创建
    }

    // 添加状态
    public void addStatus(int status) {
        this.status |= status;
    }

    // 移除状态
    public void removeStatus(int status) {
        this.status &= ~status;
    }

    // 检查是否有特定状态
    public boolean hasStatus(int status) {
        return (this.status & status) == status;
    }

    // 示例输出
    public static void main(String[] args) {
        OrderStatus orderStatus = new OrderStatus();

        System.out.println("-------订单已支付-----------");
        // 假设订单已支付
        orderStatus.addStatus(PAID);
        System.out.println("创建订单是否创建 " + orderStatus.hasStatus(CREATED));
        System.out.println("创建订单是否支付 " + orderStatus.hasStatus(PAID));

        // 假设订单已发货
        System.out.println("-------订单已发货-----------");
        orderStatus.addStatus(SHIPPED);
        System.out.println("创建订单是否发货 " + orderStatus.hasStatus(SHIPPED));

        // 假设订单已完成
        System.out.println("-------假设订单已完成-----------");
        orderStatus.addStatus(COMPLETED);
        System.out.println("创建订单是否完成 " + orderStatus.hasStatus(COMPLETED));
    }
}