Am 16.06.2015 10:40, schrieb Vladimir Ivanov:
[...]
Example:
class TopLevel {
static class Nested {}
class Inner {}
void f() {
class Local {}
}
Object o = new TopLevel() {}; // anonymous
}
And here's how they look like on bytecode level.
I'll use both javap and ASM to dump class structure:
$ java jdk.internal.org.objectweb.asm.util.ASMifier <class_file>
Nested:
javap: static #11= #10 of #5; //Nested=class TopLevel$Nested of class
TopLevel
asm: cw.visitInnerClass("TopLevel$Nested", "TopLevel", "Nested",
ACC_STATIC);
Inner:
javap: #8= #7 of #5; //Inner=class TopLevel$Inner of class TopLevel
asm: cw.visitInnerClass("TopLevel$Inner", "TopLevel", "Inner", 0);
that nested and inner differ only by the modifier is ok
Local:
javap: #13= #12; //Local=class TopLevel$1Local
asm: cw.visitInnerClass("TopLevel$1Local", null, "Local", 0);
Anonymous:
javap: #2; //class TopLevel$1
asm: cw.visitInnerClass("TopLevel$1", null, null, 0);
I did not expect that the outer class is not set for Local and Anonymous
classes. I would have thought that the enclosing method is the only
difference. That's surprising to me.... but actually there is even code
for this. And I found the bug as well... So thanks for the help
bye Jochen
--
Jochen "blackdrag" Theodorou
blog: http://blackdragsview.blogspot.com/
