问题描述
使用java反编译器(http://java.decompiler.free.fr/)反编译特定的jar时,我得到了一些奇怪的代码,无法识别出什么。有人能帮我吗?代码类似于:
When decompiling a specific jar using java decompiler (http://java.decompiler.free.fr/) I got some strange code I cannot identify what is. can someone help me? the code is something like:
Foo.access$004(Foo.this);
或此
Bar.access$006(Bar.this);
否则
Baz.access$102(Baz.this, true)
这些方法是什么 access $ 004
, access $ 006
和 access $ 102
?
推荐答案
创建类似这样的合成方法来支持访问内部类的私有方法。由于内部类不是初始jvm版本的一部分,因此访问修饰符无法真正处理这种情况。解决方案是创建其他包可见的方法,这些方法委派给私有实现。
Synthetic methods like this get created to support acessing private methods of inner classes. Since inner classes were not part of the initial jvm version, the access modifiers could not really handle this case. The solution was to create additional package-visible methods that delegate to the private implementation.
public class Example {
private static class Inner {
private void innerMethod() { ... }
}
public void test() {
Inner inner = ...
inner.innerMethod():
}
}
编译将创建 Inner
类的新方法,如下所示:
The compile would create a new method of the Inner
class like this:
static void access$000(Inner inner) {
inner.innerMethod();
}
并替换 test
这样的方法:
Inner.access$000(inner);
静态 access $ 000
可见,并且因此可以从外部类访问,并且位于同一 Inner
类内部,因此可以将其委派给私有的 innerMethod
。
The static access$000
is package visible and so accessible from the outer class, and being inside the same Inner
class it can delegate to the private innerMethod
.
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