java - 编译期间的意外异常处理

Question

我遇到了以下方法，令我惊讶的是它编译得很好:

private String getControlMessageBlocking() throws ProtocolException,
        InterruptedException, IOException {
    try {
        // <Code that may throw any of the three listed exceptions>
        return controlMessage;
    } catch (Exception e) {
        throw e;
    }

}

为什么没有必要捕获Exception？

Answer 1

这是Java 7中添加的特性。看看Rethrowing Exceptions with More Inclusive Type Checking