假设我有一个可运行的 jar (A.jar)，其中包含 .class 文件。我还有另一个可运行的 jar (B.jar)，它与 A.jar 相同，除了访问修饰符全部更改为 public(对于字段和方法)。某些语义是否有可能发生改变？它(B.jar)的工作方式与前一个(A.jar)完全相同吗？有什么危险？
编辑示例: A.jar 包含字节码(.class 文件)。我用 asm 库解析它，并将其所有修饰符更改为 public。生成的 jar 是 B.jar 文件。
最佳答案
一个可能的行为更改是私有(private)方法不能重写父类(super class)中的方法。这意味着将子类方法更改为公共(public)方法可能会更改在运行时从虚拟调用调用的方法。
来自 JVM 规范 v11 5.4.5
An instance method mC can override another instance method mA iff all of the following are true:
mC has the same name and descriptor as mA.
mC is not marked ACC_PRIVATE.
One of the following is true:
mA is marked ACC_PUBLIC.
mA is marked ACC_PROTECTED.
mA is marked neither ACC_PUBLIC nor ACC_PROTECTED nor ACC_PRIVATE, and either (a) the declaration of mA appears in the same run-time package as the declaration of mC, or (b) if mA is declared in a class A and mC is declared in a class C, then there exists a method mB declared in a class B such that C is a subclass of B and B is a subclass of A and mC can override mB and mB can override mA.
关于java - 当将项目的所有访问修饰符更改为 public 时，字节码中项目的语义是否会发生变化？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/54127275/