1.final 修饰的
2.static 修饰的
3.private 修饰的：因为私有的在子类中不可见
4.如果跨包的话，修饰符缺省的也不能被重写，因为缺省的挎包不可见
java-那些方法不能被重写
When nothing seems to help, I go look at a stonecutter hammering away at his rock, perhaps a hundred times without as much as a crack showing in it. Yet at the hundred and first blow it will split in two, and I know it was not that blow that did it, but all that had gone before. -- Jacob Riis