假设要更改已有类中一个字段的类型，例如将Person的age从整型改为短整型。

Suppose you want to change the type of a field in an existing class, for example by changing Person's age from an integer type to a short type?

youdao

假设要更改已有类中一个字段的类型，例如将Person的age从整型改为短整型。

Suppose you want to change the type of a field in an existing class, for example by changing Person's age from an integer type to a short type?

youdao