小编use*_*657的帖子

我正在尝试找到一种实现依赖于第三方库类的服务的好方法.如果库不可用或无法提供答案,我还有一个'默认'实现用作后备.

public interface Service {

    public Object compute1();

    public Object compute2();
}

public class DefaultService implements Service {

    @Override
    public Object compute1() {
       // ...
    }

    @Override
    public Object compute2() {
        // ...
    }
}

该服务的实际实现将是这样的:

public class ServiceImpl implements Service {
    Service defaultService = new DefaultService();
    ThirdPartyService thirdPartyService = new ThirdPartyService();

    @Override
    public Object compute1() {
        try {
            Object obj = thirdPartyService.customCompute1();
            return obj != null ? obj : defaultService.compute1();
        } 
        catch (Exception e) {
            return defaultService.compute1();
        }
    } …