小编Lou*_*ono的帖子

这通常不是关于异常处理的问题,但它特别适用于某些框架的使用.典型起点的几个例子:

• GWT:接口的public void onFailure(Throwable caught)实现AsyncCallback.
• JAX-RS:接口的public Response toResponse(E throwable)实现ExceptionMapper<E extends Throwable>.

上述两种方法都接收一个实例Throwable.通常,我看到开发人员使用一个简单的"if/else if"块来区分处理逻辑:

// As specified by the AsyncCallback class of the GWT framework
public void onFailure(Throwable caught) {
    if (caught instanceof AnException) {
        // handle AnException
    } else if (caught instanceof AnotherException) {
        // handle AnotherException
    } else if (caught instanceof YetAnotherException) {
        // handle YetAnotherException
    } else if (caught instanceof ...) {
        // and so on...
    }
} …