Because clone has protected access in Object and, to call clone , you have to call it through a reference to a class that has overridden clone to be public.

因为clone在Object中是保护访问的，调用clone必须通过将clone改写公共访问的类引用来完成。

youdao

Be sure your script is protected from an error; if the method call fails, it throws an exception.

要确保脚本能够应对错误；如果方法调用失败，它会抛出异常。

youdao

The method is protected, so the test can't call it directly.

这个方法是protected的方法，所以测试不能直接调用它。

youdao

Most of the communications companies using GE-3 have "protected contracts, " which call for GE Americom to move their signals to other satellites, the company said.

CNN: graphic